• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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 • 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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 • 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
• 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
Contents have been reproduced by permission of the publishers.

down
wechat
bug