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Nuclear Theory·nucl-th

Tuesday·January 26, 2021

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 23 Jan 2021]

    The Hussein-McVoy formula for inclusive breakup revisited. A Tribute to Mahir Hussein

    M. Gómez Ramos🇩🇪 · J. Gómez-Camacho🇪🇸 · Jin Lei🇨🇳 · A. M. Moro🇪🇸

    In 1985, Hussein and McVoy [Nuc. Phys. A445 (1985) 124] elucidated a formula for the evaluation of the nonelastic breakup ("stripping") contribution in inclusive breakup reactions. The formula, based on the spectator core model, acquires a particularly simple and appealing form in the eikonal limit, to the extent that it has become the standard procedure to analyze single-nucleon knockout reactions at intermediate energies. In this contribution, a critical assessment of this formula is presented and its connection with other, noneikonal expressions discussed. Some calculations comparing the different formulae are also presented for the one-nucleon removal of O+Be reaction at several incident energies.

    Comments:
    To be published in EPJA in the special issue "Cluster Structure and Dynamics of Nuclei - A Tribute to Mahir Hussein"
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2101.09497 [pdf]
    0 citations
  2. 02

    [Submitted on 25 Jan 2021]

    Electromagnetic fields from the extended Kharzeev-McLerran-Warringa model in relativistic heavy-ion collisions

    Yi Chen🇨🇳 · Xin-Li Sheng🇨🇳 · Guo-Liang Ma🇨🇳

    Based on the Kharzeev-McLerran-Warringa (KMW) model that estimates strong electromagnetic (EM) fields generated in relativistic heavy-ion collisions, we generalize the formulas of EM fields in the vacuum by incorporating the longitudinal position dependence, the generalized charge distributions and retardation correction. We further generalize the formulas of EM fields in the pure quark-gluon plasma (QGP) medium by incorporating a constant Ohm electric conductivity and also during the realistic early-time stages QGP evolution by using a time-dependent electric conductivity. Using the extended KMW model, we observe a slower time evolution and a more reasonable impact parameter dependence of the magnetic field strength than those from the original KMW model in the vacuum. The inclusion of medium effects by using the lattice data helps to further prolong the time evolution of magnetic field, such that the magnetic field strength during the realistic QGP evolution at thermal freeze-out time can meet the bound constrained from experimentally measured difference in global polarizations of and hyperons in Au+Au collisions at top RHIC energy. These generalized formulations in the extended KMW model will be potentially useful for many EM fields relevant studies in heavy-ion collisions, especially at lower colliding energies and for various species of colliding nuclei.

    Comments:
    24 pages, 7 figures; final published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2101.09845 [pdf]
    NPA(2021)·27 citations
  3. 03

    [Submitted on 25 Jan 2021]

    Correlation between initial spatial anisotropy and final momentum anisotropies in relativistic heavy ion collisions

    Sanchari Thakur🇮🇳 · Sumit Kumar Saha🇮🇳 · Pingal Dasgupta🇨🇳 · Rupa Chatterjee🇮🇳 · Subhasis Chattopadhyay🇮🇳

    The particle momentum anisotropy () produced in relativistic nuclear collisions is considered to be a response of the initial geometry or the spatial anisotropy of the system formed in these collisions. The linear correlation between and quantifies the efficiency at which the initial spatial eccentricity is converted to final momentum anisotropy in heavy ion collisions. We study the transverse momentum, collision centrality, and beam energy dependence of this correlation for different charged particles using a hydrodynamical model framework. The () correlation is found to be stronger for central collisions and also for n=2 compared to that for n=3 as expected. However, the transverse momentum () dependent correlation coefficient shows interesting features which strongly depends on the mass as well as of the emitted particle. The correlation strength is found to be larger for lighter particles in the lower region. We see that the relative fluctuation in anisotropic flow depends strongly in the value of specially in the region GeV unlike the correlation coefficient which does not show significant dependence on .

    Comments:
    10 pages, 15 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2101.09998 [pdf]
    NPA(2021)·5 citations
  4. 04

    [Submitted on 25 Jan 2021]

    Energy per particle of nuclear and neutron matter from subleading chiral three-nucleon interactions

    N. Kaiser🇩🇪

    We derive from the subleading contributions to the chiral three-nucleon interaction [published in Phys.~Rev.~C77, 064004 (2008) and Phys.~Rev.~C84, 054001 (2011)] their first-order contributions to the energy per particle of isospin-symmetric nuclear matter and pure neutron matter in an analytical way. For the variety of short-range and long-range terms that constitute the subleading chiral 3N-force the pertinent closed 3-ring, 2-ring, and 1-ring diagrams are evaluated. While 3-ring diagrams vanish by a spin-trace and the results for 2-ring diagrams can be given in terms of elementary functions of the ratio Fermi-momentum over pion mass, one ends up in most cases for the closed 1-ring diagrams with one-parameter integrals. The same treatment is applied to the subsubleading chiral three-nucleon interactions as far as these have been constructed up to now.

    Comments:
    24 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2101.10311 [pdf]
    PRC(2021)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE