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  • Systematics of electric dipole excitations for odd-mass 233−239U isotopes
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-13
    E. Tabar; H. Yakut; E. Kemah; N. Demirci Saygı; G. Hoşgör; H. Quliyev; A.A. Kuliev

    We have investigated the dipole strengths from low-lying energy region to giant dipole resonance (GDR) energy region for the 233−239U isotopes in the framework of the Translational and Galilean Invariant-Quasiparticle Nuclear Model (TGI-QPNM) and the total E1 photo-absorption cross sections have been calculated for the nuclei of interest. In the present manuscript, we present the results for the E1

    更新日期:2021-01-22
  • Role of mass asymmetry on the peak energy of intermediate mass fragments production and its influence towards isospin effects
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-22
    Sakshi Sharma; Rohit Kumar; Rajeev K. Puri

    Using the isospin-dependent quantum molecular dynamics model, we study the peak intermediate mass fragments production and corresponding center-of-mass energy in various mass asymmetric reactions. The study is spanned over different mass asymmetries for total system mass 92, 162 and 240. We propose the peak energy as a powerful probe to constrain the low-density behavior of symmetry energy. This peak

    更新日期:2021-01-22
  • X17: A new force, or evidence for a hard γ + γ process?
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-21
    Benjamin Koch

    It is investigated whether the “X17 puzzle” might be explained by a nuclear decay chain and a conversion of the two resulting highly energetic γs into an electron-positron pair. It is found that the corresponding kinematics fits perfectly to the experimental result. Also the conversion rates of this process are reasonable. However, the assumed nuclear chain reaction is not favored in the established

    更新日期:2021-01-22
  • Saturation properties of hot asymmetric nuclear matter using M3Y effective nucleon-nucleon interaction
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-21
    W.M. Seif; A.S. Hashem; R.N. Hassanien

    Understanding the nuclear equation of state (EOS) is important for a broad range of applications ranging from nuclear structure to nuclear astrophysics. In this paper we apply a non-relativistic Hartree-Fock scheme to study the temperature dependence of the EOS of hot isospin-asymmetric nuclear matter (ANM), based on M3Y-type semi-realistic nucleon-nucleon interactions. We focus on the temperature

    更新日期:2021-01-22
  • Mixing angles of ΞQ−ΞQ′ in heavy quark effective theory
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-12
    Yoshimitsu Matsui

    The Heavy Quark Effective Theory provides a systematic method to estimate a mixing angles of hadron states in a heavy quark, such as charm quark (c) and bottom quark (b). Using this method, we can estimate the mixing angles of the baryons ΞQ−ΞQ′. The mixing angles between ΞQ and ΞQ′ are given by |θb|=4.51∘±0.79∘ for the Q=b case and |θc|=8.12∘±0.80∘ for the Q=c case.

    更新日期:2021-01-19
  • Predictions for the α decay of proton-rich nuclei in the range of 86⩽Z⩽98
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-12
    Haitao Yang; Zhongxia Zhao; Xiaopan Li; Haiyan Yang; Xiaojun Bao

    The α decay half-lives of odd-A and odd-odd nuclei ranging in 65⩽Z⩽112 are investigated by employing the modified universal decay law and the unified fission model, both of them take into account the contribution of centrifugal potential. The good agreement with the experimental data indicates that the modified universal decay law and the unified fission model are useful tools to investigate these

    更新日期:2021-01-18
  • Strong couplings of heavy mesons with kaon meson in three point QCD sum rules
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-14
    M. Ali Asgarian

    The strong interaction between heavy and kaon mesons can consistently described by coupling constant in an effective lagrangian. Here, the improved strong coupling constants of gBs0B1K and gBs1B1K vertices in the framework of the three-point QCD sum rules are calculated. The coupling constants are calculated, when both the B1 and K states are off-shell. In this calculation, the contributions of the

    更新日期:2021-01-18
  • Re-examination of astrophysical S-factor of proton capture Be9(p,γ)10B in stellar matter
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-10
    Abdul Kabir; Jameel-Un Nabi

    The astrophysical S-factor for proton capture on 9Be at astrophysical is considered in this work by using a modified potential model approach. The total cross-section is taken as the sum of both direct and resonance transitions. Based on the computed total astrophysical S-factor we calculate the nuclear reaction rates within the selected range of temperatures. The calculated values of S-factor and

    更新日期:2021-01-18
  • Pseudospin and spin symmetry in the relativistic generalized Woods-Saxon potential including Coulomb-like tensor potential
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-28
    J. Akbar; A. Suparmi; C. Cari

    The Dirac Equation is solved approximately for relativistic generalized Woods-Saxon potential including Coulomb-like tensor potential in exact pseudospin and spin symmetry limits. The bound states energy eigenvalues are found by using wavefunction boundary conditions, and corresponding radial wavefunctions are obtained in terms of hypergeometric function. Some numerical examples are given for the dependence

    更新日期:2021-01-07
  • QCD hidden-color hexadiquark in the core of nuclei
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-30
    Jennifer Rittenhouse West; Stanley J. Brodsky; Guy F. de Téramond; Alfred S. Goldhaber; Iván Schmidt

    Hidden-color configurations are a key prediction of QCD with important physical consequences. In this work we examine a QCD color-singlet configuration in nuclei formed by combining six scalar [ud] diquarks in a strongly bound SU(3)C channel. The resulting hexadiquark state is a charge-2, spin-0, baryon number-4, isospin-0, color-singlet state. It contributes to alpha clustering in light nuclei and

    更新日期:2021-01-07
  • The rates of charmonium dissociation and recombination in heavy-ion collisions at sNN=5.02 TeV using Bateman equation
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-28
    Abdulla Abdulsalam

    The charmonium states with their different binding energies and radii dissolve at different temperatures of the medium produced in relativistic heavy-ion collisions. Relative yields of charmonium and thus their survival have potential to map the properties of Quark Gluon Plasma. In this study, we estimate the combined effect of color screening, gluon-induced dissociation and recombination on charmonium

    更新日期:2021-01-07
  • Level scheme of 164Dy obtained from 163Dy(nth,2γ) experiment
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-07
    Nguyen Kim Uyen; Kyung Yuk Chae; Nguyen Ngoc Duy; Soo Mi Cha; Minsik Kwag; Kim Duhyun; Le Tan Phuc; Nguyen Quang Hung; Pham Dinh Khang; Nguyen Xuan Hai; Ho Huu Thang; Nguyen Ngoc Anh

    This work presents the nuclear level scheme (NLS) of 164Dy nucleus obtained from the 163Dy(nth,2γ) experiment. The latter has used a γ−γ coincidence spectrometer to measure the two-step gamma cascades corresponding to the decays from the compound state to 9 low-lying states of 164Dy, whose energies are 0.0, 73.393, 242.234, 761.815, 828.215, 915.991, 976.916, 1039.309, and 1122.774 keV. Based on the

    更新日期:2021-01-07
  • Cluster model calculations of the 11C(p,γ)12N reaction rate and comparative overview
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-04
    S.B. Dubovichenko; N.A. Burkova; A.V. Dzhazairov-Kakhramanov; B. Beisenov

    Within the framework of the modified potential cluster model with the classification of orbital states according to Young diagrams, the astrophysical S-factor of the proton radiative capture on 11C is calculated. The calculations take into account all resonances up to 3.5 MeV and are performed at energies up to 5 MeV. Based on the obtained total cross sections, the reaction rate in the temperature

    更新日期:2021-01-06
  • Perspectives in small systems: Heavy quarks and HBT radii
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-29
    Debasish Das

    Recent observations of QGP-like phenomena in small collision systems like p+p and p+A collisions have questioned our understanding of the basic paradigms of high energy heavy-ion physics. A brief discussion of these new aspects in small systems which in turn influence our understanding of hard probes like heavy quarks has been provided. Furthermore, a closer observation of the two-particle Hanbury-Brown

    更新日期:2021-01-04
  • Investigation of the cold valley paths for the synthesis of isotopes of Ubh in optimum orientations
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-28
    Dalip Singh Verma; Kushmakshi

    Cold valley paths have been investigated for the synthesis of isotopes of superheavy element Unbihexium using quantum mechanical fragmentation theory, which suggests the fusion of fission fragments belonging to the cold valleys in the potential energy surfaces with at least one spherical closed shell nucleus as the reaction partner for the nuclear synthesis. For the suitability of the cold valley fission

    更新日期:2021-01-04
  • Antikaon-induced K1(1270)+ meson production on nuclei near threshold
    Nucl. Phys. A (IF 1.695) Pub Date : 2021-01-04
    E.Ya. Paryev

    We study the inclusive strange axial-vector meson K1(1270)+ production in K−A reactions at near-threshold laboratory incident antikaon momenta within a nuclear spectral function approach, which describes incoherent direct K1(1270)+ meson production in K− meson–proton K−p→K1(1270)+Ξ− production processes and accounts for three different options for its in-medium mass shift (or for its effective scalar

    更新日期:2021-01-04
  • Nuclear-state population transfer using composite stimulated Raman adiabatic passage
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-17
    N. Mansourzadeh-Ashkani; M. Saadati-Niari; F. Zolfagharpour; B. Nedaee-Shakarab

    Nuclear-state population transfer in three-level Λ-like nuclei that interact with two X-ray laser pulses using composite stimulated Raman adiabatic passage (CSTIRAP) technique is investigated theoretically. Due to the fact that the frequency of existing X-ray lasers is less than the frequency of gamma rays, so in this method the nuclei are accelerated and interact with two X-ray laser pulses with different

    更新日期:2020-12-23
  • Δ resonances in Ca+Ca, Ni+Ni and Au+Au reactions from 1 AGeV to 2 AGeV: Consistency between yields, mass shifts and decoupling temperatures
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-03
    Tom Reichert; Paula Hillmann; Marcus Bleicher

    The Ultra-relativistic Quantum Molecular Dynamics (UrQMD) transport approach is used to calculate Δ(1232) yields in Ca+Ca, Ni+Ni and Au+Au collisions between 1 AGeV and 2 AGeV. We compare and validate two different methods to extract the yields of Δ(1232) resonances in such low energy nuclear collisions: Firstly, the π− spectra at low pT are used to infer the Δ(1232) yield in A+A collisions, a method

    更新日期:2020-12-18
  • X0,1(2900) and (D−K+) invariant mass from QCD Laplace sum rules at NLO
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-03
    R. Albuquerque; S. Narison; D. Rabetiarivony; G. Randriamanatrika

    We revisit, improve and complete some recent estimates of the 0+ and 1− open charm (c¯d¯)(us) tetraquarks and the corresponding molecules masses and decay constants from QCD spectral sum rules (QSSR) by using QCD Laplace sum rule (LSR) within stability criteria where the factorised perturbative NLO corrections and the contributions of quark and gluon condensates up to dimension-6 in the OPE are included

    更新日期:2020-12-14
  • Quadrupole coherence enhancement in 46Ti: Mixing of f7/2 and p3/2 orbital
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-04
    Aman Rohilla; G.S. Li; Y.H. Qiang; M.L. Liu; X.H. Zhou; J.G. Wang; S. Guo; B. Ding; W.Q. Zhang; S. Huang; Y. Zheng; Y.D. Fang; S.K. Ghorui; T.X. Li; W. Hua; H. Cheng

    The 46Ti nucleus has been studied employing the nuclear reaction 12C(36Ar, 2p)46Ti for the first time at a bombarding beam energy of 145 MeV. Lifetimes have been determined employing the Doppler Shift Attenuation Method (DSAM) in low-lying positive-parity levels of yrast band with Kπ=0+. Data were acquired in a γ−γ coincidence measurement with the recently upgraded γ-ray detection array at the Institute

    更新日期:2020-12-11
  • Theoretical study of nuclear collective phenomena and broken SU(3) symmetry of even-even 238−244Pu isotopes
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-10
    H.S. El-Gendy

    Theoretical nuclear study of the even-even Plutonium Isotopes Pu238−244 was carried out. The positive-parity rotational state band was calculated in the framework of the interacting Boson model-1 (IBM-1) and modified soft rotor formula (MSRF), while the negative-parity band was calculated in the framework of the new modified negative-parity formula (NMF). Furthermore, the energy levels for the β- and

    更新日期:2020-12-11
  • On the width of the K−D atom ground state
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-03
    N. Barnea; E. Friedman; A. Gal

    Experiments at DAΦNE-Frascati and at J-PARC are scheduled to produce K−D atoms and observe their X-ray cascade down to the 1S ground state (g.s.), thereby measuring its strong-interaction width and shift away from a purely Coulomb state. A width Γ1S≲1 keV will ensure good resolution of the X-ray transitions feeding the 1S g.s. Here we study the expected K−D 1S g.s. width from the perspective of global

    更新日期:2020-12-09
  • Alpha decay half lives of spherical even-even nuclei: Role of repulsive core
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-12-01
    F. Ghorbani; S.A. Alavi; V. Dehghani

    By adding repulsive nuclear potential, in Gaussian shape and double-folding form with different values of repulsive surface diffuseness parameter, to the attractive double-folding nuclear potential (M3Y) the effect of repulsive core on alpha decay half-lives and decay parameters of some even-even alpha emitters were analyzed. Calculations were accomplished using WKB approximation by considering Bohr-Sommerfeld

    更新日期:2020-12-07
  • Two diffraction cones of elastic scattering and structural symmetry conjecture
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-25
    A.P. Samokhin

    The energy dependence of the differential cross-section of elastic proton-proton scattering in the ISR–LHC energy range is discussed for fixed values of momentum transfer in the region of the forward diffraction cone, in the region beyond the second maximum of dσ/dt and in the vicinity of the dip-bump structure. As can be seen from the currently available experimental data, the differential cross-section

    更新日期:2020-12-01
  • Localization of peripheral reactions and sensitivity to the imaginary potential
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-19
    Imane Moumene; Angela Bonaccorso

    The aim of the present study is to make for the first time in the literature a systematic and quantitative assessment of the evaluation of the imaginary part of the optical potential calculated within the folding model and its consequences on the localization of surface reactions. Comparing theoretical and experimental reaction cross sections, for some light projectiles on a 9Be target, it has recently

    更新日期:2020-11-26
  • Folding model approach to the elastic p+12,13C scattering at low energies and radiative capture 12,13C(p,γ) reactions
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-11
    Nguyen Le Anh; Nguyen Hoang Phuc; Dao T. Khoa; Le Hoang Chien; Nguyen Tri Toan Phuc

    The proton radiative capture 12,13C(p,γ) reactions at astrophysical energies, key processes in the CNO cycle, are revisited in the potential model with the proton-nucleus potential for both the scattering and bound states obtained in the folding model, using a realistic density dependent nucleon-nucleon interaction. For the consistency, this same folding model is also used to calculate the optical

    更新日期:2020-11-25
  • Analysis of the 3He(α,γ)7Be and 3H(α,γ)7Li astrophysical direct capture reactions in a modified potential-model approach
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-17
    E.M. Tursunov; S.A. Turakulov; A.S. Kadyrov

    Astrophysical S factors and reaction rates of the direct radiative capture processes He3(α,γ)7Be and H3(α,γ)7Li, as well as the primordial abundance of the Li7 element, are estimated in the framework of a modified two-body potential model. It is shown that suitable modification of phase-equivalent α−3He potentials in the d waves can improve the description of the astrophysical S factor for the direct

    更新日期:2020-11-19
  • Microscopic description of structural, surface, and decay properties of Z=124, 126 superheavy nuclei
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-13
    Tasleem Ahmad Siddiqui; Abdul Quddus; Shakeb Ahmad; S.K. Patra

    A systematic investigation has been carried out for even-even isotopic series of two superheavy nuclei with Z=124 and Z=126 in the region 160≤N≤220, and 162≤N≤218, respectively, within the framework of covariant density functional theory (CDFT). Based on the potential energy curves calculated using the explicit density-dependent meson-exchange (DD-ME) and point-coupling (DD-PC) models, many sensitive

    更新日期:2020-11-18
  • Decay spectroscopy of 117,118Sn
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-11
    Sangeeta Das; Anik Adhikari; S.S. Alam; Sathi Sharma; Suman Aich; Arkabrata Gupta; Y. Sapkota; Ananya Das; A. Saha; S.K. Dey; Dibyadyuti Pramanik; Abhijit Bisoi; Indrani Ray; Tumpa Bhattacharjee; C.C. Dey; S. Sarkar; M. Saha Sarkar

    The low-lying states of 117,118Sn have been studied from the decay of 117g,118mSb, and 117mSn. These long-lived species were populated through the reaction 4He + natIn at Elab = 32 MeV. Singles, as well as γ-γ coincidence data, were acquired. The uncertainties in the placement of some of the γ-rays in the excitation spectra of 118Sn observed by previous workers have been removed. A γ-ray (984 keV)

    更新日期:2020-11-12
  • Cluster structure of 20Ne: Evidence for D3h symmetry
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-06
    R. Bijker; F. Iachello

    We study the cluster structure of 20Ne and show that the available experimental data can be well described by a bi-pyramidal structure with D3h symmetry. Strong evidence for the occurrence of this symmetry comes from the observation of all nine expected vibrational modes (3 singly degenerate and 3 doubly degenerate) and of six (singly degenerate) double vibrational modes. 20Ne appears to be another

    更新日期:2020-11-06
  • Cross sections for the production of radionuclides via natCu(p,X) spallation reactions for proton energies from 250 MeV to 2 GeV
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-05
    Patrick N. Peplowski

    Spallation cross sections for 250 MeV to 2 GeV protons bombarding thin targets of natural copper were determined via the foil activation technique. This energy range is important for cosmogenic radionuclide production in interplanetary space via bombardment by galactic cosmic-ray protons. Cross sections are reported for the production of 60Co, 58Co, 57Co, 56Co, 56Ni, 59Fe, 54Mn, 52Mng, 51Cr, 48V, 47Sc

    更新日期:2020-11-06
  • Relativistic rank-one separable kernel for helium-3 charge form factor
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-28
    Serge Bondarenko; Valery Burov; Sergey Yurev

    Elastic electron-helium-3 scattering is studied in the relativistic impulse approximation. The amplitudes for the three-nucleon system are obtained by solving the relativistic generalization of the Faddeev equations with a separable rank-one kernel of the nucleon-nucleon interaction. The contribution of partial-wave states with nonzero orbital moment of a nucleon pair is investigated. The static approximation

    更新日期:2020-11-04
  • The energies and ANCs for 5Li resonances deduced from experimental p-α scattering phase shifts using the effective-range and Δ methods
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-20
    Yu.V. Orlov

    Recently a new Δ method for deducing the energy and asymptotic normalization coefficient (ANC) from phase-shift data has been formulated and applied to resonance states. This differs from the conventional effective-range function (ERF) method by fitting only the Δl function included in the nuclear part of the effective radius function Kl(k2), which is determined by the Coulomb-nuclear scattering phase

    更新日期:2020-11-04
  • Proposed new classification among coexistence nuclei
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-26
    H.T. Fortune

    I propose a new classification of coexistence nuclei that involves E2 transition matrix elements connecting the ground state, 21 and 22 (or 23) states. A dimensionless ratio, based only on experimental information, is defined, and most coexistence nuclei are found to lie within one of only two narrow bands of this ratio.

    更新日期:2020-11-04
  • The study of the gluon distribution function and reduced cross section behavior using the proton structure function
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-11-03
    G.R. Boroun; B. Rezaei

    The behavior of the gluon distribution function and the reduced cross section considered from the proton structure function and its derivatives at low values of x. These behaviors studied and compared with the experimental data. These results are augmented by including an additional higher-twist term in the description of the nonlinear correction. This additional term, modified nonlinear correction

    更新日期:2020-11-03
  • Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-29
    U.K. Singh; R. Sharma; P.K. Sharma; M. Kaushik; S.K. Jain; G. Saxena

    Transfermium nuclei (101≤Z≤110) are investigated thoroughly to describe structural properties viz. deformation, radii, shapes, magicity, etc. as well as their probable decay chains. These properties are explored using relativistic mean-field (RMF) approach and compared with other theories along with available experimental data. Neutron numbers N=152 and 162 have come forth with a deformed shell gap

    更新日期:2020-10-30
  • Proton and neutron skins and symmetry energy of mirror nuclei
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-20
    M.K. Gaidarov; I. Moumene; A.N. Antonov; D.N. Kadrev; P. Sarriguren; E. Moya de Guerra

    The neutron skin of nuclei is an important fundamental property, but its accurate measurement faces many challenges. Inspired by charge symmetry of nuclear forces, the neutron skin of a neutron-rich nucleus is related to the difference between the charge radii of the corresponding mirror nuclei. We investigate this relation within the framework of the Hartree-Fock-Bogoliubov method with Skyrme interactions

    更新日期:2020-10-29
  • Exclusive vector meson production in electron – ion collisions at the EIC, LHeC and FCC–eh
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-14
    Victor P. Gonçalves; Daniel E. Martins; Celso R. Sena

    The exclusive vector meson production in electron – ion collisions for the energies of the future colliders is investigated. We present predictions for the coherent and incoherent ϕ and J/ψ production in eAu collisions considering the possible states of nucleon configurations in the nuclear wave function and taking into account of the non - linear corrections to the QCD dynamics. The cross sections

    更新日期:2020-10-29
  • Study of medium modified jet shape observables in Pb-Pb collisions at sNN=2.76TeV using EPOS and JEWEL event generators
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-27
    Sumit Kumar Saha; Debojit Sarkar; Subhasis Chattopadhyay; Ashik Ikbal Sheikh; Sidharth Kumar Prasad

    The jet-medium interaction in high energy heavy ion collisions is an important phenomenon to characterize the hot and dense medium produced in such collisions. The study of medium-induced modifications to the substructure of inclusive charged jets indicates a redistribution of energy inside the jet cone and provides insight into the energy loss mechanisms of jets in the medium. We investigate the in-medium

    更新日期:2020-10-29
  • Finite-temperature quarkyonic matter with an excluded volume model
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-19
    Srimoyee Sen; Neill C. Warrington

    We introduce a theoretical framework to analyze the thermal properties of a recently proposed “excluded volume” model of quarkyonic matter. This entails proposing finite temperature distribution functions and entropy functionals constrained by internal theoretical consistency. We use the formalism developed here to analyze the effect of temperature on the quark onset as a function of baryon density

    更新日期:2020-10-29
  • Nuclear matter properties of finite nuclei using relativistic mean field formalism
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-09
    S.K. Biswal; M.K.Abu El Sheikh; N. Biswal; N. Yusof; H.A. Kassim; S.K. Patra; M. Bhuyan

    In this theoretical study, we establish a correlation between the neutron skin thickness and the nuclear symmetry energy for the even–even isotones for magic neutron N = 20, 40, 82, and 126 within self-consistent relativistic mean-field formalism for non-linear NL3⁎ and density-dependent DD-ME2 parameter sets. The local density approximation is used to formulate the symmetry energy, and its co-efficient

    更新日期:2020-10-16
  • Spectral fluctuations and thermalization in the f5p-shell space
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-08
    Adel K. Hamoudi; Altaf A. Al-Rahmani; Haydar A. Abd Alabas

    Chaos against thermalization, which was earlier investigated in the sd-shell space, is examined in the f5p-shell space. The two-body residual interaction of f5pvh with realistic single-particle energies have been utilized for carrying out f5p-shell space calculations. The present study demonstrates that the spectral fluctuations computed with realistic single-particle energies are in accordance with

    更新日期:2020-10-12
  • Sensitivity of the mean field dynamics within quantum molecular dynamics
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-10
    Yong-Zhong Xing; Wei-Chen Fu; Xiao-Bin Liu; Fei-Ping Lu; Hong-Fei Zhang; Yu-Ming Zheng

    Started from the static state with certain macroscopic stable and instable conditions, we have studied the behavior of the deterministic chaos by propagating the systems under only the action of the consistent mean field describing the real nuclear reaction at intermediate energy without the randomness caused by the random collisions between nucleons. The disassembly of the system including evaporation

    更新日期:2020-10-11
  • Helicity-dependent extension of the McLerran–Venugopalan model
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-05
    Florian Cougoulic; Yuri V. Kovchegov

    We construct a generalization of the McLerran–Venugopalan (MV) model including helicity effects for a longitudinally polarized target (a proton or a large nucleus). The extended MV model can serve as the initial condition for the helicity generalization of the JIMWLK evolution equation constructed in our previous paper, as well as for calculation of helicity-dependent observables in the quasi-classical

    更新日期:2020-10-08
  • Charged charm stars
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-10-05
    Victor P. Gonçalves; Lucas Lazzari

    The study of the general properties and stability of charm stars with a net electric charge is performed within the MIT bag model framework. We consider two different models for the electric charge distribution and demonstrate that both imply stellar configurations with larger masses and that satisfy the equilibrium condition. The dynamical stability against radial oscillations is investigated. Our

    更新日期:2020-10-07
  • A way forward towards the improvement of tensor force in pf-shell
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-16
    Kanhaiya Jha; Pawan Kumar; Shahariar Sarkar; P.K. Raina; Sezgin Aydin

    In many shell model interactions, the tensor force monopole matrix elements are observed to retain systematic trends originating in the bare tensor force. In this work, however, we note for GX-interactions of pf-shell that the seven out of ten T = 1 tensor force monopole matrix elements do not share these systematic. We ameliorate this disparity making use of Yukawa-type tensor force and spin-tensor

    更新日期:2020-09-29
  • Higher-rank discrete symmetries in the IBM. III Tetrahedral shapes
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-24
    P. Van Isacker; A. Bouldjedri; S. Zerguine

    In the context of the sf-IBM, the interacting boson model with s and f bosons, the conditions are derived for a rotationally invariant and parity-conserving Hamiltonian with up to two-body interactions to have a minimum with tetrahedral shape in its classical limit. A degenerate minimum that includes a shape with tetrahedral symmetry can be obtained in the classical limit of a Hamiltonian that is transitional

    更新日期:2020-09-29
  • Critical potentials and fluctuations phenomena with quartic, sextic, and octic anharmonic oscillator potentials
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-16
    M.M. Hammad; M.M. Yahia; H.A. Motaweh; S.B. Doma

    This is an investigation of the energy levels of three classes of two-dimensional anharmonic oscillator potentials characterized by free-, one-, and two- parameters with quartic, sextic, and octic anharmonicity. The wave functions and energy eigenvalues are found through the discretization using the nine-point finite-difference method. It is proved that the free-parameter potentials provide a “bridge”

    更新日期:2020-09-21
  • The collective excitation of nuclear matter in a bosonized Landau Fermi liquid model
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-09
    Bao-Xi Sun

    The collective excitation of nuclear matter is analyzed in a bosonized Landau Fermi liquid model. When the nonlinear self-interacting terms of scalar mesons are included in Walecka model, the collective excitation energy of nuclear matter can be obtained self-consistently, and the calculation results are consistent with the corresponding experimental data of the nucleus P208b when the quantum number

    更新日期:2020-09-21
  • Study of decay modes in transfermium isotopes
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-14
    U.K. Singh; P.K. Sharma; M. Kaushik; S.K. Jain; Dashty T. Akrawy; G. Saxena

    In the unknown territory of transfermium nuclei, the relativistic mean-field (RMF) theory has been applied to probe decay modes which include α-decay, spontaneous fission (SF), and a less explored weak-decay. These decay modes are analyzed on equal footing for 101≤Z≤109 and as a consequence, the half-lives for weak-decay are indeed found comparable for several isotopes. Our prediction of decay modes

    更新日期:2020-09-20
  • Nucleon momentum distribution extracted from the experimental scaling function
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-07
    M.V. Ivanov; A.N. Antonov; J.A. Caballero

    The connection between the scaling function, directly extracted from the analysis of electron scattering data, and the nuclear spectral function or nuclear momentum density is investigated at depth. The dependence of the scaling function on the two independent variables in the scattering process, the transfer momentum (q) and the scaling variable (y), is taken into account, and the analysis is extended

    更新日期:2020-09-16
  • Initial nuclear effects in the improved HIJING code and the production of charged pions, kaons and (anti)protons at STAR BES
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-08
    Nuha Felemban

    The improved Heavy Ion Jet Interaction Generator (HIJING) code is introduced to explore possible initial nuclear effects on the bulk observables of charged pions, kaons and (anti)protons observed in Au+Au collisions at sNN=7.7, 11.5, 19.6, 27 and 39 GeV. The standard HIJING code is extended by (i) different baryon production mechanisms, and (ii) Regge collective cascade recipe. We find that the centrality

    更新日期:2020-09-11
  • Fission partition a reflection of shell closures: Decay of 220,224U⁎ at eight excitation energies
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-05
    Dalip Singh Verma

    Decay modes of the compound systems formed in 86Kr + 134,138Ba → 220,224U⁎ reactions at eight excitation energies have been compared to explore the influence of shell closures and excitation energy. The mass distributions of the cross-sections have been calculated for the two compound systems by keeping their excitation energies the same. The production cross-section for the light particles, intermediate

    更新日期:2020-09-10
  • Higher-rank discrete symmetries in the IBM. II Octahedral shapes: Dynamical symmetries
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-09-01
    A. Bouldjedri, S. Zerguine, P. Van Isacker

    The symmetries of the sdg-IBM, the interacting boson model with s, d and g bosons, are studied as regards the occurrence of shapes with octahedral symmetry. It is shown that no sdg-IBM Hamiltonian with a dynamical symmetry displays in its classical limit an isolated minimum with octahedral shape. However, a degenerate minimum that includes a shape with octahedral symmetry can be obtained from a Hamiltonian

    更新日期:2020-09-01
  • Decoding the QCD critical behaviour in A + A collisions
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-08-26
    N.G. Antoniou, N. Davis, F.K. Diakonos, G. Doultsinos, N. Kalntis, A. Kanargias, A.S. Kapoyannis, V. Ozvenchuk, C.N. Papanicolas, A. Rybicki, E. Stiliaris

    In a systematic search for the QCD critical point in nuclear collisions, at the CERN SPS, it was found that intermittency measurements in the freeze-out state of central Si+Si collisions, at the maximum SPS energy, provide us with an indication of sizeable critical fluctuations. Also, rather recently, a weaker effect was traced in preliminary data of the Ar+Sc reaction for 10–20% most central collisions

    更新日期:2020-08-26
  • Vertices of the scalar and axial vector charmed mesons with vector kaon: Three-point QCD sum rules
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-08-20
    M. Ali Asgarian, M. Janbazi, E. Kazemi, F. Kamgar, M.R. Seyedhabashi

    In this article, the three-point QCD sum rules are used to compute the strong coupling constants of vertices containing strange charmed mesons with the K⁎. The coupling constants are calculated when both charm and K⁎ states are off-shell. In this calculation, the contributions of the quark-quark, quark-gluon, and gluon-gluon condensates corrections are considered. Considering the SUf(3) symmetry, the

    更新日期:2020-08-20
  • A theoretical analysis of the cross sections of 18,19,20O + 12C fusion reactions by using different density distributions
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-08-20
    Gokhan Kocak, Murat Aygun

    In this study, we examine the cross sections of 18,19,20O + 12C fusion reactions at energies near and below Coulomb barrier within the optical model. To propose alternative density distributions for theoretical studies of fusion reactions of oxygen isotopes (18,19,20O) and carbon target, we evaluate three different density distributions of 18,19,20O and 12C nuclei. Moreover, we apply two different

    更新日期:2020-08-20
  • Dynamics of critical fluctuations: Theory – phenomenology – heavy-ion collisions
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-08-20
    Marcus Bluhm, Alexander Kalweit, Marlene Nahrgang, Mesut Arslandok, Peter Braun-Munzinger, Stefan Floerchinger, Eduardo S. Fraga, Marek Gazdzicki, Christoph Hartnack, Christoph Herold, Romain Holzmann, Iurii Karpenko, Masakiyo Kitazawa, Volker Koch, Stefan Leupold, Aleksas Mazeliauskas, Bedangadas Mohanty, Alice Ohlson, Nicolas Wink

    This report summarizes the presentations and discussions during the Rapid Reaction Task Force “Dynamics of critical fluctuations: Theory – phenomenology – heavy-ion collisions”, which was organized by the ExtreMe Matter Institute EMMI and held at GSI, Darmstadt, Germany in April 2019. We address the current understanding of the dynamics of critical fluctuations in QCD and their measurement in heavy-ion

    更新日期:2020-08-20
  • The interplay between the nuclear level density and the separation energy of rotating superheavy nucleus Z = 119 at low temperature regime
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-08-19
    P. Preetha, S. Santhosh Kumar

    The temperature dependence of the level density parameter and the neutron separation energy are determined under statistical assumptions with regard to the excitation energy using the statistical model code developed in FORTRAN language. The quadrupole deformation parameter and the inverse level density parameter are coinciding well with the experimental results concerning the available literatures

    更新日期:2020-08-19
  • Neutrino beams at ultra high energy proton colliders on the basis of focusing single crystals
    Nucl. Phys. A (IF 1.695) Pub Date : 2020-08-18
    Yu.A. Chesnokov, V.A. Maisheev

    The problem of creation of high energy neutrino beams on the basis of modern and future circular proton accelerators with the help of traditional technology seems to be expensive and difficult. In our previous article we proposed a new method for generation of neutrino beams for 6.5 TeV protons at the LHC based on the use of focusing bent single crystals. However, in last years there have been publications

    更新日期:2020-08-18
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