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Nuclear Theory·nucl-th

Friday·February 12, 2021

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 10 Feb 2021]

    Nuclear Excitation by Electron Capture in Excited Ions

    Simone Gargiulo · Ivan Madan · Fabrizio Carbone

    A nuclear excitation following the capture of an electron in an empty orbital has been recently observed for the first time. So far, the evaluation of the cross section of the process has been carried out widely using the assumption that the ion is in its electronic ground state prior to the capture. We show that by lifting this restriction new capture channels emerge resulting in a boost of more than three orders of magnitude to the electron capture resonance strength.

    Comments:
    Accepted for Publication in Physical Review Letters
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2102.05718 [pdf]
    PRL(2022)·21 citations
  2. 02

    [Submitted on 11 Feb 2021]

    Dependence on beam energy and nuclear equation of state dependence of anisotropic flow and particle production in low-energy heavy-ion collisions

    Sumit Kumar Kundu🇮🇳 · Yoshini Bailung🇮🇳 · Sudhir Pandurang Rode🇮🇳 · Partha Pratim Bhaduri🇮🇳 · Ankhi Roy🇮🇳

    We analyse various flow coefficients of anisotropic momentum distribution of final state particles in mid-central ( 5--9 ) Au + Au collisions in the beam energy range GeV. Different variants of the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model, namely the pure transport (cascade) mode and the hybrid mode, are employed for this investigation. In the hybrid UrQMD model, the ideal hydrodynamical evolution is integrated with the pure transport calculation for description of the evolution of the fireball. We opt for the different available equations of state (EoS) replicating the hadronic as well as partonic degrees of freedom together with possible phase transitions, viz. hadron gas, chiral + deconfinement EoS and bag model EoS, to investigate their effect on the properties of the final state particles. We also attempt to gain insights about the dynamics of the medium by studying different features of particle production such as particle ratios and net-proton rapidity distribution. The results and conclusions drawn here would be useful to understand the response of various observables to the underlying physics of the model as well as to make comparisons with the upcoming measurements of the future experiments at Facility for Antiproton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA).

    Comments:
    14 pages, 12 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2102.05967 [pdf]
    PRC(2021)·5 citations
  3. 03

    [Submitted on 11 Feb 2021]

    Urca Cooling in Neutron Star Crusts and Oceans: Effects of Nuclear Excitations

    Long-Jun Wang🇨🇳 · Liang Tan🇨🇳 · Zhipan Li🇨🇳 · G. Wendell Misch🇺🇸 · Yang Sun🇨🇳

    The excited-state structure of atomic nuclei can modify nuclear processes in stellar environments. In this work, we study the influence of nuclear excitations on Urca cooling (repeated back-and-forth beta decay and electron capture in a pair of nuclear isotopes) in the crust and ocean of neutron stars. We provide for the first time an expression for Urca process neutrino luminosity which accounts for excited states of both members of an Urca pair. We use our new formula with state-of-the-art nuclear structure inputs to compute neutrino luminosities of candidate Urca cooling pairs. Our nuclear inputs consist of the latest experimental data supplemented with calculations using the projected shell model. We show that, in contrast with previous results that only consider the ground states of both nuclei in the pair, our calculated neutrino luminosities for different Urca pairs vary sensitively with the environment temperature and can be radically different from those obtained in the one transition approximation.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2102.06010 [pdf]
    PRL(2021)·27 citations
  4. 04

    [Submitted on 11 Feb 2021]

    Trinucleon form factors with relativistic multirankseparable kernels

    Serge Bondarenko🇷🇺 · Valery Burov🇷🇺 · Sergey Yurev🇷🇺

    This paper studies elastic electron-trinucleon scattering in the relativistic impulse approximation. The amplitudes for a trinucleon have been obtainedby solving the relativistic generalization of the Faddeev equations with amultirank separable kernel of the nucleon-nucleon interactions. The staticapproximation and additional relativistic corrections for the trinucleon electromagnetic form factors have been calculated for the momentum transfersquared up to 50 fm^-2

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2102.06061 [pdf]
    NPA(2021)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE