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  • Neutron star equation of state and tidal deformability with nuclear energy density functionals
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-06-02
    Young-Min Kim, Kyujin Kwak, Chang Ho Hyun, Hana Gil, Chang-Hwan Lee

    Neutron star physics is the ultimate testing place for the physics of dense nuclear matter. Before the detection of gravitational waves from the merger of binary neutron stars, various nuclear equations of state have been used to estimate the macroscopic properties of neutron stars, such as masses and radii, based on electromagnetic observations. However, recent observations of the tidal deformability

    更新日期:2020-06-02
  • Branching ratio of the super-allowed $$\beta $$β decay of $$^{10}$$10 C
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-31
    B. Blank, M. Aouadi, P. Ascher, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian Nieto, M. R. Dunlop, R. Dunlop, A. T. Laffoley, G. F. Grinyer, P. Finlay

    In an experiment performed at the ISOLDE facility of CERN, the super-allowed \(\beta \)-decay branching ratio of \(^{10}\)C was determined with a high-precision single-crystal germanium detector. In order to evaluate the contribution of the pile-up of two 511 keV \(\gamma \) quanta to one of the \(\gamma \)-ray peaks of interest at 1021.7 keV, data were not only taken with \(^{10}\)C, but also with

    更新日期:2020-05-31
  • Production of quasi-stellar neutron field at explosive stellar temperatures
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-30
    Moshe Friedman

    Neutron-induced reactions on unstable isotopes play a key role in the nucleosynthesis i-, r-, p-, rp- and \(\nu p\)-processes occurring in astrophysical scenarios. While direct cross section measurements are possible for long-lived unstable isotopes using the neutron Time-of-Flight method, the currently available neutron intensities (\(\approx 10^{6}\) n/s) require large samples which are not feasible

    更新日期:2020-05-30
  • Helicity amplitudes in the $${\bar{B}} \rightarrow D^{*} {\bar{\nu }}_\tau \tau $$B¯→D∗ν¯ττ decay with V-A breaking in the quark sector
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-28
    L. R. Dai, E. Oset

    In view of the recent measurement of the \(F_L^{D^*}\) magnitude in the \({\bar{B}} \rightarrow D^{*} {\bar{\nu }}_\tau \tau \) reaction we evaluate this magnitude within the standard model and for a family of models with the \(\gamma ^\mu -\alpha \gamma ^\mu \gamma _5\) current structure for the quarks for different values of \(\alpha \). At the same time we evaluate also the transverse contributions

    更新日期:2020-05-28
  • First comparison of GEANT4 hadrontherapy physics model with experimental data for a NUMEN project reaction case
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-26
    J. R. B. Oliveira, M. Moralles, D. Flechas, D. Carbone, M. Cavallaro, D. Torresi, L. Acosta, C. Agodi, P. Amador-Valenzuela, D. Bonanno, T. Borello-Lewin, G. A. Brischetto, S. Calabrese, D. Calvo, V. Capirossi, F. Cappuzzello, E. R. Chavez-Lomelí, I. Ciraldo, F. Delaunay, H. Djapo, C. Eke, P. Finocchiaro, S. Firat, M. Fisichella, A. Foti, G. Gallo, M. A. Guazzelli, A. Hacisalihoglu, F. Iazzi, R. Linares

    Gamma-ray and neutron spectra from the \(^{18}\hbox {O }{+}^{76} \hbox {Se}\) reaction at 15.3 MeV/u were measured with the EDEN array of liquid scintillators at the LNS. The results were compared to GEANT Hadrontherapy physics list simulations in order to assess the reliability of this model for the development of the NUMEN project. A good agreement with the shape of the experimental gamma-ray spectra

    更新日期:2020-05-26
  • How to renormalize integral equations with singular potentials in effective field theory
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-26
    E. Epelbaum, A. M. Gasparyan, J. Gegelia, Ulf-G. Meißner, X.-L. Ren

    We briefly review general concepts of renormalization in quantum field theory and discuss their application to solutions of integral equations with singular potentials in the few-nucleon sector of the low-energy effective field theory of QCD. We also describe a particular subtractive renormalization scheme and consider a specific application to a toy-model with a singular potential serving as its effective

    更新日期:2020-05-26
  • The $$^{136}\hbox {Xe} + ^{198}\hbox {Pt}$$136Xe+198Pt reaction: a detailed re-examination
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-25
    V. V. Desai, W. Loveland, R. Yanez, G. Lane, S. Zhu, A. D. Ayangekaa, J. P. Greene, F. G. Kondev, R. V. F. Janssens, P. A. Copp

    We extend previous measurements of the transfer product yields in the reaction of \(\hbox {E}_{c.m.} = 450\hbox { MeV} ^{~136}\hbox {Xe}\) with \(^{198}\hbox {Pt}\) by measurements of the product yields using Gammasphere. By recording events occurring in beam bursts and in between beam bursts, we are able to extend the number of measured product yields from 78 to 171 nuclides. Our new data span a much

    更新日期:2020-05-25
  • A study of excited $$\Omega _b^-$$Ωb- states in hypercentral constituent quark model via artificial neural network
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-25
    Halil Mutuk

    In this work, we have obtained mass spectra, radiative decay widths and strong decay widths of newly observed excited \(\Omega _b^-\) states, i.e. \(\Omega _b(6316)^-\), \(\Omega _b(6330)^-\), \(\Omega _b(6340)^-\), and \(\Omega _b(6350)^-\). Mass spectrum is obtained in Hypercentral Constituent Quark Model (hCQM) by solving six-dimensional nonrelativistic Schrödinger equation via Artificila Neural

    更新日期:2020-05-25
  • Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the $$\pi (p_{3/2})\rightarrow \pi (p_{1/2})$$π(p3/2)→π(p1/2) spin-flip transition in $$^{85}\hbox {Br}$$85Br
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-25
    P. Napiralla, M. Lettmann, C. Stahl, G. Rainovski, N. Pietralla, S. Afara, F. Ameil, T. Arici, S. Aydin, D. Barrientos, P. Bednarczyk, M. A. Bentley, G. Benzoni, B. Birkenbach, A. Blazhev, A. J. Boston, P. Boutachkov, A. Bracco, B. Bruyneel, E. Clément, M. L. Cortés, F. C. L. Crespi, D. M. Cullen, D. Curien, P. Désesquelles, F. Didierjean, C. Domingo-Pardo, G. Duchêne, J. Eberth, H. Egger, C. Fahlander

    A first performance test of the Coulomb excitation multipolarimetry (Coulex-multipolarimetry) method is presented. It is based on a \(^{85}\hbox {Br}\,\pi p_{3/2}\rightarrow \pi p_{1/2}\) spin-flip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum für Schwerionenforschung (GSI). Via determination of background levels around the expected \(^{85}\hbox {Br}\) excitations

    更新日期:2020-05-25
  • Scission point model applied to $$^{181} \hbox {Re}^{*}$$181Re∗ formed in $$^{12}{} \mathbf{C}+^{169}$$12C+169 Tm reaction
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-25
    C. Karthika, M. Balasubramaniam

    An scission point model improved by including angular momentum effects is used to study the recently reported heavy-ion-induced fission of \(^{181} \hbox {Re}^*\) formed in the \(^{12}\)C+\(^{169}\)Tm reaction at three different lab energies, especially to estimate the fragment cross section. The fission is characterized as a two-stage process. Through energy balance criteria the scission point for

    更新日期:2020-05-25
  • The jurogam 3 spectrometer
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-25
    J. Pakarinen, J. Ojala, P. Ruotsalainen, H. Tann, H. Badran, T. Calverley, J. Hilton, T. Grahn, P. T. Greenlees, M. Hytönen, A. Illana, A. Kauppinen, M. Luoma, P. Papadakis, J. Partanen, K. Porras, M. Puskala, P. Rahkila, K. Ranttila, J. Sarén, M. Sandzelius, S. Szwec, J. Tuunanen, J. Uusitalo, G. Zimba

    The jurogam 3 spectrometer has been constructed for in-beam \(\gamma \)-ray spectroscopy experiments in the Accelerator Laboratory of the University of Jyväskylä, Finland. jurogam 3 consists of germanium-detector modules in a compact geometry surrounding a target to measure \(\gamma \) rays emitted from radioactive nuclei. jurogam 3 can be employed in conjunction with one of two recoil separators,

    更新日期:2020-05-25
  • Fine structure of $$\alpha $$α decay from the time-dependent pairing equations
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-25
    M. Mirea

    The \(\alpha \) decay half-lives and the fine structure phenomenon are investigated with fission-like models. A superasymmetric fission path in a configuration space spanned by five degrees of freedom is determined in accordance with the least action principle. The deformation energy is evaluated within the macroscopic–microscopic approach while the inertia is obtained in the framework of the cranking

    更新日期:2020-05-25
  • Setup commissioning for an improved measurement of the D(p, $$\gamma $$γ ) $$^3$$3 He cross section at Big Bang Nucleosynthesis energies
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-20
    V. Mossa, K. Stöckel, F. Cavanna, F. Ferraro, M. Aliotta, F. Barile, D. Bemmerer, A. Best, A. Boeltzig, C. Broggini, C. G. Bruno, A. Caciolli, L. Csedreki, T. Chillery, G. F. Ciani, P. Corvisiero, T. Davinson, R. Depalo, A. Di Leva, Z. Elekes, E. M. Fiore, A. Formicola, Zs. Fülöp, G. Gervino, A. Guglielmetti, C. Gustavino, G. Gyürky, G. Imbriani, M. Junker, I. Kochanek, M. Lugaro, L. E. Marcucci, P

    Among the reactions involved in the production and destruction of deuterium during Big Bang Nucleosynthesis, the deuterium-burning D(p,\(\gamma \))\(^3\)He reaction has the largest uncertainty and limits the precision of theoretical estimates of primordial deuterium abundance. Here we report the results of a careful commissioning of the experimental setup used to measure the cross-section of the D(p

    更新日期:2020-05-20
  • Chiral phase transition in the linear sigma model within Hartree factorization under $$(1-q)$$(1-q) expansion and free particle approximation in the Tsallis nonextensive statistics
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-20
    Masamichi Ishihara

    We studied chiral phase transition in the linear sigma model within the Tsallis nonextensive statistics under some approximations. The statistics has two parameters: the temperature T and the entropic parameter q. The normalized q-expectation value and the physical temperature \(T_{\mathrm {ph}}\) were employed in this study. The normalized q-expectation value was expanded as a series of the value

    更新日期:2020-05-20
  • New narrow LHCb pentaquarks as lowest antiquark-diquark-diquark systems
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    A. N. Semenova, V. V. Anisovich, A. V. Sarantsev

    The antiquark-diquark-diquark model describes pentaquark states both in terms of quarks and hadrons. We discuss pentaquark states with hidden charm \(P(\bar{c} cuud)\) discovered in the \(J/\varPsi p\) spectrum by the LHCb collaboration. We consider three pentaquark states as members of the lowest (S-wave) multiplet and discuss the mass splitting scheme. The latest LHCb data for pentaquarks with hidden

    更新日期:2020-05-19
  • Hyperon III: $$K^{-}p - \pi \varSigma $$K-p-πΣ coupled-channel dynamics in the $$\varLambda (1405)$$Λ(1405) mass region
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    A. V. Anisovich, A. V. Sarantsev, V. A. Nikonov, V. Burkert, R. A. Schumacher, U. Thoma, E. Klempt

    Low-energy data on the three charge states in \(\gamma p \rightarrow K^+(\varSigma \pi )\) from CLAS at JLab, on \(K^-p\rightarrow \pi ^0\pi ^0\varLambda \) and \(\pi ^0\pi ^0\varSigma \) from the Crystal Ball at BNL, bubble chamber data on \(K^-p\rightarrow \pi ^-\pi ^+\pi ^{\pm }\varSigma ^{\mp }\), low-energy total cross sections on \(K^-\) induced reactions, and data on the \(K^-p\) atom are fitted

    更新日期:2020-05-19
  • Multiplicity dependence of J/ $$\psi $$ψ production and QCD dynamics in $$p+p$$p+p collisions at $$\sqrt{s}$$s = 13 TeV
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    Suman Deb, Dhananjaya Thakur, Sudipan De, Raghunath Sahoo

    In inelastic \(p+p\) collisions, the interacting objects are quarks and gluons (partons). It is believed that there are multiple interactions between the partons in a single \(p+p\) event. Recent studies of multiplicity dependence of particle production in \(p+p\) collisions have gathered considerable interest in the scientific community. According to several theoretical calculations, multiple gluon

    更新日期:2020-05-19
  • Low-energy super Gamow–Teller (LeSGT) and anti-LeSGT transitions
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    Y. Fujita, Y. Utsuno, H. Fujita

    The LS-closed doubly-magic nuclei (DMN) \(^{4}_{2}\mathrm{He}_{2}\), \(^{16}_{\;\, 8}{\mathrm{O}}_{8}\), and \(^{40}_{20}{\mathrm{Ca}}_{20}\) behave as inert cores for Gamow–Teller (GT) excitations. It is known that GT transition strengths from nuclei with DMN + identical two-nucleon particles (2p) to nuclei with DMN + proton-neutron particles (\(\pi p\)-\(\nu p\)), i.e., \(^{6}_{2}{\mathrm{He}}_{4}\)\(\rightarrow

    更新日期:2020-05-19
  • On reaction mechanisms in deuteron–proton elastic scattering
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    N. B. Ladygina

    The deuteron–proton elastic scattering is considered in the full angular range at the two deuteron energies of 880 MeV and 1200 MeV. Four reaction mechanisms are taken into account. The effects of various contributions are analyzed. The obtained theoretical predictions are compared with the existing experimental data for the differential cross section, and vector \(A_y\) and tensor \(A_{yy}\) analyzing

    更新日期:2020-05-19
  • Compex: a cubic germanium detector
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    A. Såmark-Roth, D. M. Cox, J. Eberth, P. Golubev, D. Rudolph, L. G. Sarmiento, G. Tocabens, M. Ginsz, B. Pirard, P. Quirin

    The Compex detector is an electrically cooled, composite germanium detector that uses four coaxial, cubic-shaped, single-encapsulated germanium crystals. This novel detector allows for new heights in photon detection efficiency in decay spectroscopy setups using box-shaped vacuum chambers. Its spectroscopic performance and detection efficiency is evaluated by means of source measurements. Motivated

    更新日期:2020-05-19
  • Study of $${\varvec{{\varXi ^{-}}}}$$Ξ- hypernuclei in the Skyrme–Hartree–Fock approach
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    Yun Jin, Xian-Rong Zhou, Yi-Yuan Cheng, H.-J. Schulze

    The properties of \({\varXi ^{-}}\) hypernuclei are studied systematically using a two-dimensional Skyrme–Hartree–Fock approach combined with three different \(\varXi N\) Skyrme forces fitted to reproduce the existing data. We explore the impurity effect of a single \({\varXi ^{-}}\) hyperon on the radii, deformations, and density distributions of the nuclear core and point out qualitative differences

    更新日期:2020-05-19
  • Emergence of simple patterns in many-body systems: from macroscopic objects to the atomic nucleus
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    R. F. Garcia Ruiz, A. R. Vernon

    Strongly correlated many-body systems often display the emergence of simple patterns and regular behaviour of their global properties. Phenomena such as clusterization, collective motion and appearance of shell structures are commonly observed across different size, time, and energy scales in our universe. Although at the microscopic level their individual parts are described by complex interactions

    更新日期:2020-05-19
  • Mass and half-life measurements of neutron-deficient iodine isotopes
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    Samuel Ayet San Andrés, Ali Mollaebrahimi, Timo Dickel, Julian Bergmann, Jens Ebert, Hans Geissel, Florian Greiner, Emma Haettner, Christine Hornung, Nasser Kalantar-Nayestanaki, Ivan Miskun, Wolfgang R. Plaß, Sivaji Purushothaman, Ann-Kathrin Rink, Christoph Scheidenberger, Helmut Weick, Soumya Bagchi, Paul Constantin, Andrew Finlay, Satbir Kaur, Wayne Lippert, Israel Mardor, Bo Mei, Iain Moore, Jan-Hendrick

    Neutron-deficient iodine isotopes, \(^{116}\)I and \(^{114}\)I, were produced at relativistic energies by in-flight fragmentation at the Fragment Separator (FRS) at GSI. The FRS Ion Catcher was used to thermalize the ions and to perform highly accurate mass measurements with a Multiple-Reflection Time-of-Flight Mass-Spectrometer (MR-TOF-MS). The masses of both isotopes were measured directly for the

    更新日期:2020-05-19
  • Physics opportunities with the Advanced Gamma Tracking Array: AGATA
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    W. Korten, A. Atac, D. Beaumel, P. Bednarczyk, M. A. Bentley, G. Benzoni, A. Boston, A. Bracco, J. Cederkäll, B. Cederwall, M. Ciemała, E. Clément, F. C. L. Crespi, D. Curien, G. de Angelis, F. Didierjean, D. T. Doherty, Zs. Dombradi, G. Duchêne, J. Dudek, B. Fernandez-Dominguez, B. Fornal, A. Gadea, L. P. Gaffney, J. Gerl, K. Gladnishki, A. Goasduff, M. Górska, P. T. Greenlees, H. Hess, D. G. Jenkins

    New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4\(\pi \) instrument. AGATA is a high-resolution \(\gamma \)-ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring \(\gamma \) rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual

    更新日期:2020-05-19
  • Identical pion intensity interferometry at $$\sqrt{s_{\mathrm{NN}}}=2.4~\hbox {GeV}$$sNN=2.4GeV
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-19
    J. Adamczewski-Musch, O. Arnold, C. Behnke, A. Belounnas, A. Belyaev, J. C. Berger-Chen, J. Biernat, A. Blanco, C. Blume, M. Böhmer, P. Bordalo, S. Chernenko, L. Chlad, C. Deveaux, J. Dreyer, A. Dybczak, E. Epple, L. Fabbietti, O. Fateev, P. Filip, P. Fonte, C. Franco, J. Friese, I. Fröhlich, T. Galatyuk, J. A. Garzón, R. Gernhäuser, M. Golubeva, R. Greifenhagen, F. Guber, M. Gumberidze, S. Harabasz

    High-statistics \(\pi ^-\pi ^-\) and \(\pi ^+\pi ^+\) femtoscopy data are presented for Au + Au collisions at \(\sqrt{s_\mathrm{NN}} = 2.4~\hbox {GeV}\), measured with HADES at SIS18/GSI. The experimental correlation functions allow the determination of the space-time extent of the corresponding emission sources via a comparison to models. The emission source, parametrized as three-dimensional Gaussian

    更新日期:2020-05-19
  • Probing of incomplete fusion dynamics in $${}^{{14}}\text {N} + {}^{{124}}\text {Sn}$$14N+124Sn system and its correlation with various entrance channel effects
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-18
    Amritraj Mahato, D. Singh, Pankaj K. Giri, Sneha B. Linda, Harish Kumar, Suhail A. Tali, M. Afzal Ansari, R. Kumar, S. Muralithar, R. P. Singh

    Measurements of excitation functions were done for the evaporation residues populated in \({}^{{14}}\text {N}+{}^{{124}}\text {Sn}\) system at low energy. The present analysis shows the appearance of incomplete fusion by the breakup of non-\(\upalpha \) cluster structured projectile \(^{{14}}\text {N}\) into \(\upalpha + {}^{{10}}\text {B}\). A correlation between the combined effects of total asymmetry

    更新日期:2020-05-18
  • Analysis of the reaction cross sections of $$^{15,16}C+^{12}C$$15,16C+12C and $$^{15,16}C+^{27}Al$$15,16C+27Al at intermediate energies using microscopic optical potential and Glauber model
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-18
    M. Rashdan

    The reaction cross sections of \(^{15,16}C+^{12}C\) and \(^{15,16}C+^{27}Al\) are calculated at intermediate energies using microscopic complex optical potential (OP) derived from Brueckner G-matrix. Glauber model (GM) with and without in-medium effects are also used for comparison. Different models for the density distributions such as deformed Fermi density, whose deformation parameters and radii

    更新日期:2020-05-18
  • Theoretical study of spin observables in $$\varvec{pd}$$pd elastic scattering at energies $$\varvec{T_p = 800}$$Tp=800 – $$\varvec{1000}$$1000 MeV
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-18
    Maria N. Platonova, Vladimir I. Kukulin

    Various spin observables (analyzing powers and spin-correlation parameters) in pd elastic scattering at \(T_p = 800\)–1000 MeV are analyzed within the framework of the refined Glauber model. The theoretical model uses as input spin-dependent NN amplitudes obtained from the most recent partial-wave analysis and also takes into account the deuteron D wave and charge-exchange effects. Predictions of the

    更新日期:2020-05-18
  • Prompt $$\upgamma $$γ -ray results of two deterministic modelings of prompt emission in fission
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-18
    Anabella Tudora

    The paper includes prompt \(\upgamma \)-ray results provided by two deterministic modelings of prompt emission developed at the University of Bucharest. The very good description of experimental prompt \(\upgamma \)-ray data as a function of A and TKE by the multi-parametric matrices as primary results of both modelings assures a supplementary validation of the models themselves. The very good agreement

    更新日期:2020-05-18
  • Dispersive corrections in elastic electron-nucleus scattering: an investigation in the intermediate energy regime and their impact on the nuclear matter
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-18
    P. Guèye, A. A. Kabir, P. Giuliani, J. Glister, B. W. Lee, R. Gilman, D. W. Higinbotham, E. Piasetzky, G. Ron, A. J. Sarty, S. Strauch, A. Adeyemi, K. Allada, W. Armstrong, J. Arrington, H. Arenaövel, A. Beck, F. Benmokhtar, B. L. Berman, W. Boeglin, E. Brash, A. Camsonne, J. Calarco, J. P. Chen, S. Choi, E. Chudakov, L. Coman, B. Craver, F. Cusanno, J. Dumas, C. Dutta, R. Feuerbach, A. Freyberger

    Measurements of elastic electron scattering data within the past decade have highlighted two-photon exchange contributions as a necessary ingredient in theoretical calculations to precisely evaluate hydrogen elastic scattering cross sections. This correction can modify the cross section at the few percent level. In contrast, dispersive effects can cause significantly larger changes from the Born approximation

    更新日期:2020-05-18
  • Investigation of relativistic symmetry from different fields with the similarity renormalization group
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-18
    Qiang Xu, Li-Feng Luo

    Influences from different fields of mesons and photons on the relativistic symmetry are reinvestigated with the similarity renormalization group method (SRG). The energy splittings of pseudospin doublet and spin doublet are extracted from the SRG calculations. From the point view of the SRG method, \(\omega \) field is revealed to exert great effect on the pseudsospin symmetry by nonrelativistic term

    更新日期:2020-05-18
  • Yrast band in the heavy N = Z nucleus $$^{88}$$88 Ru: $$\alpha $$α -cluster approach
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-18
    Peter Mohr

    The yrast band in the heavy \(N = Z\) nucleus \(^{88}\)Ru is studied in the framework of the \(\alpha \)-cluster model in combination with double-folding potentials. It is found that the excitation energies of the yrast band in \(^{88}\)Ru can be nicely described within the \(\alpha \)-cluster approach using a smooth and mildly L-dependent adjustment of the potential strength. This result is similar

    更新日期:2020-05-18
  • Ground-state and isomeric-state cross-sections for $$^{{74}}$$74 Se(n,2n) $$^{{73}}$$73 Se reaction in the 13–15 MeV energy region
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-04
    Junhua Luo, Li Jiang

    Activation technique was applied for the measurement of ground-state and isomeric-state cross-sections in the \(^{{74}}\)Se(n,2n)\(^{{73}}\)Se reaction within the 13–15 MeV neutron energy range to resolve inconsistencies in the existing database. \(\gamma \) rays with energy of 253.7 keV from the decay of the \(^{{73\text {m}}}\)Se isomeric-state and energy of 361.2 keV from the \(^{{73\text {g}}}\)Se

    更新日期:2020-05-04
  • A mixing interpolation method to mimic pasta phases in compact star matter
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-05-04
    David Blaschke, David Alvarez-Castillo

    We present a new method to interpolate between two matter phases that allows for a description of mixed phases and can be used, e.g., for mimicking transitions between pasta structures occurring in the crust as well as in the inner core of compact stars. This interpolation method is based on assuming switch functions that are used to define a mixture of subphases while fulfilling constraints of thermodynamic

    更新日期:2020-05-04
  • Particle productions and anisotropic flows from the AMPT model for Cu+Au collisions at $$\sqrt{s_{NN}}=200$$sNN=200 GeV
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-27
    Yuncun He, Zi-Wei Lin

    We use the string melting version of a multi-phase transport (AMPT) model to study Cu+Au collisions at \(\sqrt{s_{NN}}=200\) GeV. The rapidity distributions of identified hadrons show asymmetric dependences on rapidity. In addition, elliptic and triangular flows at mid-rapidity from the AMPT model for pions, kaons, and protons agree reasonably with the experimental data up to \(p_{T}\sim 1\) GeV/c

    更新日期:2020-04-27
  • Role of vector channel in different classes of (non) magnetized neutron stars
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-27
    Luiz L. Lopes, Debora P. Menezes

    We study how the magnetic field and non-standard vector channels affect hadronic, quark and hybrid stars. In the hadronic phase, we use the QHD model, with its standard \(\sigma \omega \rho \) mesons, and compare the results with the ones obtained with the inclusion of the strangeness hidden \(\phi \) meson. In the quark phase, we use the standard SU(3) NJL and compare the results with the version

    更新日期:2020-04-27
  • The ideal hydrodynamic limit and non-Abelian gauge symmetries
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-24
    Giorgio Torrieri

    We show that the ideal fluid local equilibrium limit, defined as the existence of a flow frame \(u_\mu \) which characterises the direction of both a conserved entropy current and conserved charge currents is incompatible with non-Abelian gauge theory if local color charge density is non-zero. Instead, the equation of state becomes dependent on \(u_\mu \) via modes which are roughly equivalent to ghost

    更新日期:2020-04-24
  • Probing ab initio emergence of nuclear rotation
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-23
    Mark A. Caprio, Patrick J. Fasano, Pieter Maris, Anna E. McCoy, James P. Vary

    Structural phenomena in nuclei, from shell structure and clustering to superfluidity and collective rotations and vibrations, reflect emergent degrees of freedom. Ab initio theory describes nuclei directly from a fully microscopic formulation. We can therefore look to ab initio theory as a means of exploring the emergence of effective degrees of freedom in nuclei. For the illustrative case of emergent

    更新日期:2020-04-23
  • Renormalization of pionless effective field theory in the A-body sector
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-23
    M. Drissi, T. Duguet, V. Somà

    Current models of inter-nucleon interactions are built within the frame of Effective Field Theories (EFTs). Contrary to traditional nuclear potentials, EFT interactions require a renormalization of their parameters in order to derive meaningful estimations of the observables. In this paper, a renormalization procedure is designed in connection with many-body approximations applicable to large-\(\mathrm

    更新日期:2020-04-23
  • A look at multiparticle production via modified combinants
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-21
    Han Wei Ang, Aik Hui Chan, Mahumm Ghaffar, Maciej Rybczyński, Grzegorz Wilk, Zbigniew Włodarczyk

    As shown recently, one can obtain additional information from the measured charged particle multiplicity distributions, P(N), by investigating the so-called modified combinants, \(C_j\), extracted from them. This information is encoded in the observed specific oscillatory behaviour of \(C_j\), which phenomenologically can be described only by some combinations of compound distributions based on the

    更新日期:2020-04-22
  • A consistency test of EFT power countings from residual cutoff dependence
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-21
    Harald W. Grießhammer

    I summarise a method to quantitatively assess the consistency of power-counting proposals in Effective Field Theories which are non-perturbative at leading order. It uses the fact that the Renormalisation Group evolution of an observable predicts the functional form of its residual cutoff dependence on the breakdown scale of an Effective Field Theory (EFT), on the low-momentum scales, and on the order

    更新日期:2020-04-22
  • Measurement of prompt fission neutron and gamma spectra in the fast neutron induced fission of $$^{232}$$232 Th
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-21
    Sukanya De, G. Mishra, R. G. Thomas, Ajay Kumar, A. Mitra, B. K. Nayak

    Measurements of prompt fission neutrons and gamma rays spectra have been carried out in the fast neutron induced fission of \(^{232}\)Th at an average neutron energy of 2.6 MeV. The energy spectrum of neutrons is obtained from the time-of-flight spectrum measured using EJ301 detectors with respect to a twin section trigger fission chamber, while the energy spectrum of prompt gamma rays is obtained

    更新日期:2020-04-22
  • Fluctuations, criticality and nonequilibrium effect of the QCD matter
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-20
    Guo-yun Shao, Xue-yan Gao, Wei-bo He

    The multiplicity distributions of net-baryon number fluctuation in the first-order chiral phase transition associated with the nonequlibrium effect are investigated within the improved Polyakov–Nambu–Jona–Lasinio model. Compared with the idealized first-order transition in equilibrium, the calculation indicates that the density fluctuations in the metastable and unstable regions are more violent, which

    更新日期:2020-04-22
  • Mid-rapidity dependence of pion production in $$p-p$$p-p and $$A-A$$A-A collisions.
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-16
    A. I. Malakhov, G. I. Lykasov

    The calculation of inclusive spectra of pions produced in pp and AA collisions as functions of the rapidity y is presented within the self-similarity approach. It is shown that at not too large rapidities y one can obtain an analytical form of the self-similarity function \(\varPi (y,p_t)\) dependent on y and on the hadron transverse momentum \(p_t\). A satisfactory description of the data on rapidity

    更新日期:2020-04-22
  • Energies and radii of light nuclei around unitarity
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-15
    Sebastian König

    Light nuclei fall within a regime of universal physics governed by the fact that the two-nucleon scattering lengths are large compared to the typical nuclear interaction range set by one-pion exchange. This places nuclear physics near the so-called unitarity limit in which the scattering lengths are exactly infinite. Effective field theory provides a powerful theoretical framework to capture this separation

    更新日期:2020-04-22
  • Isospin dependence of fragment yields in peripheral heavy ion collisions
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-08
    H. Imal, N. Buyukcizmeci, R. Ogul, A. S. Botvina

    We have theoretically investigated isospin dependence in peripheral isospin asymmetric \(^{112}\)Sn + \(^{124}\)Sn and \(^{124}\)Sn + \(^{112}\)Sn reaction systems at 50 MeV/nucleon projectile energy. Mass, charge and isotope yields emitted from the excited quasiprojectile sources are obtained within a statistical approach. In order to interpret the experimental data, the N/Z ratio, isotope yield,

    更新日期:2020-04-22
  • Combining phase-space and time-dependent reduced density matrix approach to describe the dynamics of interacting fermions
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-08
    Thomas Czuba, Denis Lacroix, David Regnier, Ibrahim Ulgen, Bulent Yilmaz

    The possibility to apply phase-space methods to many-body interacting systems might provide accurate descriptions of correlations with a reduced numerical cost. For instance, the so-called stochastic mean-field phase-space approach, where the complex dynamics of interacting fermions is replaced by a statistical average of mean-field like trajectories is able to grasp some correlations beyond the mean-field

    更新日期:2020-04-22
  • Neutron matter at the interface(s)
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-08
    Mateusz Buraczynski, Nawar Ismail, Alexandros Gezerlis

    Neutron matter is interesting both as an extension of terrestrial nuclear physics and due to its significance for the study of neutron stars. In this work, after some introductory comments on nuclear forces, nuclear ab initio theory, and nuclear phenomenology, we employ two techniques, Quantum Monte Carlo (QMC) and Energy Density Functionals, to practically handle an extended system composed of strongly

    更新日期:2020-04-22
  • Heavy hadron molecules in effective field theory: the emergence of exotic nuclear landscapes
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-07
    Manuel Pavon Valderrama

    Heavy hadron molecules were first theorized from a crude analogy with the deuteron and the nuclear forces binding it, a conjecture which was proven to be on the right track after the discovery of the X(3872). However, this analogy with nuclear physics has not been seriously exploited beyond a few calculations in the two- and three-body sectors, leaving a great number of possible theoretical consequences

    更新日期:2020-04-22
  • The BGOOD experimental setup at ELSA
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-06
    S. Alef, P. Bauer, D. Bayadilov, R. Beck, M. Becker, A. Bella, J. Bieling, S. Böse, A. Braghieri, K.-Th. Brinkmann, P. L. Cole, R. Di Salvo, D. Elsner, A. Fantini, O. Freyermuth, F. Frommberger, G. Gervino, F. Ghio, S. Goertz, A. Gridnev, E. Gutz, D. Hammann, J. Hannappel, W. Hillert, O. Jahn, R. Jahn, J. R. Johnstone, R. Joosten, T. C. Jude, H. Kalinowsky, V. Kleber, F. Klein, K. Kohl, K. Koop, N

    The BGOOD experiment at the ELSA facility in Bonn has been commissioned within the framework of an international collaboration. The experiment pursues a systematic investigation of non-strange and strange meson photoproduction, in particular t-channel processes at low momentum transfer. The setup uniquely combines a central almost \(4\pi \) acceptance BGO crystal calorimeter with a large aperture forward

    更新日期:2020-04-22
  • Equivalence of the phenomenological Tsallis distribution to the transverse momentum distribution of q -dual statistics
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-06
    A. S. Parvan

    In the present work, we have found that the phenomenological Tsallis distribution (which nowadays is largely used to describe the transverse momentum distributions of hadrons measured in pp collisions at high energies) is consistent with the basis of the statistical mechanics if it belongs to the q-dual nonextensive statistics instead of the Tsallis one. We have defined the q-dual statistics based

    更新日期:2020-04-22
  • Shape isomers in Pt, Hg and Pb isotopes with $${\hbox {N}}\le 126$$N≤126
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-06
    K. Pomorski, B. Nerlo-Pomorska, A. Dobrowolski, J. Bartel, C. M. Petrache

    Deformation-energy surfaces of 54 even-even isotopes of Pt, Hg and Pb nuclei with neutron numbers up to 126 are investigated within a macroscopic-microscopic model based on the Lublin-Strasbourg-Drop macroscopic energy and shell plus pairing-energy corrections obtained from a Yukawa-folded mean-field potential at the desired deformation. A new, rapidly converging Fourier shape parametrization is used

    更新日期:2020-04-22
  • Spin assignments for $$^{23}\hbox {Mg}$$23Mg levels and the astrophysical $$^{22}\hbox {Na}(p,\gamma )^{23}\hbox {Mg}$$22Na(p,γ)23Mg reaction
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-06
    M. S. Kwag, K. Y. Chae, S. Ahn, D. W. Bardayan, K. A. Chipps, J. A. Cizewski, M. E. Howard, R. L. Kozub, K. Kwak, B. Manning, M. Matos, P. D. O’Malley, S. D. Pain, W. A. Peters, S. T. Pittman, A. Ratkiewicz, M. S. Smith, S. Strauss

    The \(^{22}\hbox {Na}(p,\gamma )^{23}\hbox {Mg}\) reaction is responsible for destruction of the long-lived radionuclide \(^{22}\hbox {Na}\) produced during nova explosions. Since the reaction proceeds through resonances from levels in \(^{23}\hbox {Mg}\) above the proton threshold at 7.581 MeV, the properties of these levels such as excitation energies, spins, and parities are crucial ingredients

    更新日期:2020-04-22
  • Firm spin and parity assignments for high-lying, low-spin levels in stable Si isotopes
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-06
    J. Sinclair, M. Scheck, S. W. Finch, Krishichayan, U. Friman-Gayer, W. Tornow, G. Battaglia, T. Beck, R. Chapman, M. M. R. Chishti, Ch. Fransen, R. Gonzales, E. Hoemann, J. Isaak, R. V. F. Janssens, D. A. Jaroszynski, S. Johnson, M. D. Jones, J. M. Keatings, N. Kelly, J. Kleemann, D. Little, B. Löher, K. R. Mashtakov, M. Müscher, D. O’Donnell, O. Papst, E. E. Peters, D. Savran, M. Schilling, R. Schwengner

    A natural silicon target was investigated in a \(^{\text {nat}}\)Si(\(\mathbf {\gamma },\gamma ^{\prime }\)) photon-scattering experiment with fully linearly-polarised, quasi-monochromatic \(\mathbf {\gamma }\) rays in the entrance channel. The mean photon energies used were \(\langle {E}_{\gamma }\rangle =\) 9.33, 9.77, 10.17, 10.55, 10.93, and 11.37 MeV, and the relative energy spread (full width

    更新日期:2020-04-22
  • Multiplicity dependence of strange and multi-strange hadrons in p–p, p–Pb and Pb–Pb collisions at LHC energies using Tsallis–Weibull formalism
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-03
    Pritam Chakraborty, Tulika Tripathy, Subhadip Pal, Sadhana Dash

    The transverse momentum (\(p_{T}\)) distribution of strange hadrons (\(K_{S}^{0}\) and \(\varLambda \)) and multi-strange hadrons( \(\varXi \) and \(\varOmega \)) measured in p–p, p–Pb, and Pb–Pb collisions at LHC energies has been studied for different multiplicity classes using Tsallis–Weibull (or q-Weibull) formalism. The distribution describes the measured \(p_{T}\) spectra for all multiplicity

    更新日期:2020-04-22
  • Nuclear neck-density determination at Fermi energy with CHIMERA detector
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-02
    A. Pagano, E. De Filippo, E. Geraci, E. V. Pagano, P. Russotto, K. Siwek-Wilczyńska, L. Acosta, L. Auditore, T. Cap, G. Cardella, M. B. Chatterjee, M. Colonna, B. Gnoffo, F. Favela, G. Lanzalone, C. Maiolino, N. S. Martorana, M. Papa, S. Pirrone, G. Politi, E. Piasecki, L. Quattrocchi, F. Rizzo, A. Trifirò, M. Trimarchi

    Binary collisions of either stable or radioactive heavy ions at Fermi energies allow to study the nuclear reaction mechanisms under dynamical conditions of non-equilibrium and the formation of transient pieces of nuclear matter of very short mean life times at sub-normal density. An important role in the evolutionary phase of the collision is played by the gradient of the nuclear density affecting

    更新日期:2020-04-22
  • Negative heat capacity for hot nuclei using formulation from the microcanonical ensemble INDRA Collaboration
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-04-01
    B. Borderie, S. Piantelli, E. Bonnet, R. Bougault, A. Chbihi, J. E. Ducret, J. D. Frankland, E. Galichet, D. Gruyer, M. Henri, M. La Commara, N. Le Neindre, I. Lombardo, O. Lopez, L. Manduci, M. Pârlog, R. Roy, G. Verde, M. Vigilante

    By using freeze-out properties of multifragmenting hot nuclei produced in quasifusion central \(^{129}\hbox {Xe}+^{nat}\hbox {Sn}\) collisions at different beam energies (32, 39, 45 and 50 AMeV) which were estimated by means of a simulation based on experimental data collected by the \(4\pi \) INDRA multidetector, heat capacity in the thermal excitation energy range 4–12.5 AMeV was calculated from

    更新日期:2020-04-22
  • Uncertainty quantification and falsification of chiral nuclear potentials
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-03-30
    R. Navarro Pérez, E. Ruiz Arriola

    Are chiral theories at present describing experimental NN scattering data satisfactorily? Will the chiral approach offer a framework where fitting and selecting the existing np and pp data can be done without theoretical bias? While predictive power in theoretical nuclear physics has been a major concern in the study of nuclear structure and reactions, the Effective Field Theory (EFT) based on chiral

    更新日期:2020-04-22
  • Search for beta-delayed proton emission from $$^{11}$$11 Be
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-03-30
    K. Riisager, M. J. G. Borge, J. A. Briz, M. Carmona-Gallardo, O. Forstner, L. M. Fraile, H. O. U. Fynbo, A. Garzon Camacho, J. G. Johansen, B. Jonson, M. V. Lund, J. Lachner, M. Madurga, S. Merchel, E. Nacher, T. Nilsson, P. Steier, O. Tengblad, V. Vedia

    We report on an attempt to reproduce the observation of \(\beta ^-\)-delayed proton emission from \(^{11}\)Be through detection of the final state nucleus \(^{10}\)Be with accelerator mass spectrometry. Twelve samples were collected at the ISOLDE facility at CERN at different separator settings, allowing tests of different sources of contamination to be carried out. The observed amounts of \(^{10}\)Be

    更新日期:2020-04-22
  • Potential of prompt $$\gamma $$γ -ray emission studies in fast-neutron induced fission: a first step
    Eur. Phys. J. A (IF 2.481) Pub Date : 2020-03-25
    L. Qi, C. Schmitt, M. Lebois, A. Oberstedt, S. Oberstedt, J. N. Wilson, A. Al-Adili, A. Chatillon, D. Choudhury, A. Gatera, G. Georgiev, A. Göök, B. Laurent, A. Maj, I. Matea, S. J. Rose, B. Wasilewska, F. Zeiser

    Abstract Prompt \(\gamma \)-ray spectra emitted in fast-neutron induced fission of \(^{239}\)Pu have been recently measured by using the LICORNE directional neutron source at E\(_n\) = 1.8 MeV. The results are used in parallel with the measurements of fast-neutron induced fission of \(^{238}\)U and spontaneous fission of \(^{252}\)Cf to assess the potential of such reactions and observables, in contributing

    更新日期:2020-03-28
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