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Nuclear Theory·nucl-th

Tuesday·April 26, 2022

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 22 Apr 2022]

    Event-by-event anti-deuteron multiplicity fluctuation in Pb+Pb collisions at TeV

    Kai-Jia Sun🇨🇳 · Che Ming Ko🇺🇸

    Using the nucleon coalescence model based on kinetic freeze-out nucleons from the hybrid model of MUSIC hydrodynamics and UrQMD hadronic transport, we study the production of anti-deuteron and its event-by-event fluctuation in Pb+Pb collisions at TeV. We find a clear suppression of the anti-deuteron to antiproton yield ratio in peripheral collisions, which is in accordance with the measurements from the ALICE Collaboration. Also found is a Poissonian event-by-event fluctuation of the anti-deuteron multiplicity distribution in all collision centralities, which is different from the prediction of a simple coalescence model calculation that assumes all antiproton and antineutron pairs to have the same probability to form anti-deuterons. We further find a small negative correlation between the anti-deuteron and antiproton multiplicity distributions as a result of the baryon conservation.

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2204.10879 [pdf]
    PLB(2023)·10 citations
  2. 02

    [Submitted on 23 Apr 2022]

    The relationship of the neutron-skin thickness to the symmetry energy and its slope

    Toshio Suzuki

    The neutron-skin thickness of asymmetric semi-infinite nuclear matter is shown to be a function of Coulomb energy, the asymmetry-energy coefficient(), the slope() of the asymmetry energy, and the incompressibility coefficient, in addition to he Fermi momentum and the asymmetry parameter. The relational formula is derived on the basis of the Hugenholtz-Van Hove theorem in the mean-field approximation for nuclear matter. Using the formula as a guide, the neutron-skin thickness() in Pb is examined. The linear correlation between and appears as a kind of spurious ones through the model-dependent correlation of with which is included in the main components of the formula.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2204.11013 [pdf]
    PTEP(2022)·11 citations
  3. 03

    [Submitted on 24 Apr 2022]

    Exploring the ground state bulk and decay properties of the nuclei in superheavy island

    Nishu Jain · Raj Kumar · M. Bhuyan

    The -decay half-lives of 204 superheavy nuclei covering the range have been investigated using the relativistic mean-field model (RMF) for NL3 parameter set. The ground state bulk properties such as binding energy, quadrupole deformation parameter ( ), and root-mean-square charge radii for these nuclei are analyzed. Four different semi-empirical formulae, namely, the universal decay law (UDL), the Viola-Seaborg (VSS) formula, the modified universal decay law (MUDL), and the modified Brown formula (MBrown), are used to obtain the -decay half-lives for the considered nuclei. To examine the applicability of relativistic mean-field model within NL3 parametrization, the -decay energies, and the half-lives of a few known superheavy nuclei within the range 102 Z 118 are calculated and the results are compared with the experimental data along with the theoretical predictions. The -decay energies (-values) are estimated from the binding energies of the parent, and daughter from the RMF (NL3) parameter set. The calculated results are compared with macroscopic-microscopic Finite-Range-Droplet-Model (FRDM), Global Nuclear Mass Model (WS3, WS4), Weizsacker-Skyrme mass model (WS) predictions, and the experimental data, wherever available. The possible standard deviations are also estimated for experimental and various theoretical predictions. We find a good consistency for the experimental-to-UDL, FRDM-to-UDL, and WS4-to-UDL estimates of the decay energy and corresponding half-life. The present analysis provides the theoretical predictions within the microscopic model for the upcoming experiments on the superheavy region.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2204.11173 [pdf]
    NPA(2022)·5 citations
  4. 04

    [Submitted on 25 Apr 2022]

    Pairing enhancement in a two-neutron transfer process through the continuum

    Gagandeep Singh · Lorenzo Fortunato · Andrea Vitturi

    Enhancement, due to constructive interference through the many possible reaction channels, occurs in two-neutron transfer reactions from a bound system to a weakly-bound system (+2), whenever the intermediate system is unbound and consists of a continuum with a resonant state. We elucidate this phenomenon in the case of He, modeled as two neutrons in the orbitals of an intermediate He nucleus, comparing the realistic case of an unbound (+1) system with an artificially bound case. A properly modeled continuum in these calculations is found to be crucial and leads to significant enhancement due to pairing correlations.

    Comments:
    9 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2204.11739 [pdf]
    PLB(2022)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE