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Nuclear Theory·nucl-th

Thursday·October 14, 2021

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 01

    [Submitted on 13 Oct 2021]

    Axially-deformed solution of the Skyrme-Hartree-Fock-Bogoliubov equations using the transformed harmonic oscillator basis (IV) hfbtho (v4.0): A new version of the program

    P. Marevic · N. Schunck · E. M. Ney · R. Navarro Pérez · M. Verriere · J. O'Neal

    We describe the new version 4.0 of the code hfbtho that solves the nuclear Hartree-Fock-Bogoliubov problem by using the deformed harmonic oscillator basis in cylindrical coordinates. In the new version, we have implemented the restoration of rotational, particle number, and reflection symmetry. The restoration of rotational symmetry does not require using bases closed under rotation. Furthermore, the SeaLL1 functional was added and the calculation of the Coulomb potential was improved. Finally, the code has been refactored to facilitate maintenance and future developments.

    Comments:
    21 pages, 7 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2110.06424 [pdf]
    Comput.Phys.Commun.(2022)·51 citations
  2. 02

    [Submitted on 13 Oct 2021] (cross-list from astro-ph.HE)

    A Nuclear Equation of State Inferred from Stellar r-process Abundances

    Erika M. Holmbeck · Richard O'Shaughnessy · Vera Delfavero · Krzysztof Belczynski

    Binary neutron star mergers (NSMs) have been confirmed as one source of the heaviest observable elements made by the rapid neutron-capture (r-) process. However, modeling NSM outflows -- from the total ejecta masses to their elemental yields -- depends on the unknown nuclear equation of state (EOS) that governs neutron-star structure. In this work, we derive a phenomenological EOS by assuming that NSMs are the dominant sources of the heavy element material in metal-poor stars with r-process abundance patterns. We start with a population synthesis model to obtain a population of merging neutron star binaries and calculate their EOS-dependent elemental yields. Under the assumption that these mergers were responsible for the majority of r-process elements in the metal-poor stars, we find parameters representing the EOS for which the theoretical NSM yields reproduce the derived abundances from observations of metal-poor stars. For our proof-of-concept assumptions, we find an EOS that is slightly softer than, but still in agreement with, current constraints, e.g., by the Neutron Star Interior Composition Explorer, with ~km and of ~M(statistical uncertainties, neglecting modeling systematics).

    Comments:
    11 pages, 8 figures
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2110.06432 [pdf]
    ApJ(2022)·7 citations
  3. 03

    [Submitted on 13 Oct 2021] (cross-list from nucl-ex)

    Temperature and Density Conditions for Alpha Clustering in Excited Self-Conjugate Nuclei

    Bernard Borderie · Adriana Raduta · Enrico De Filippo · Elena Geraci · Nicolas Le Neindre · Giuseppe Cardella · Gaetano Lanzalone · Ivano Lombardo · Olivier Lopez · Concettina Maiolino · Angelo Pagano · Massimo Papa and 3 other authors

    Starting from experimental studies on alpha-clustering in excited self-conjugate nuclei (from O to Si), temperature and density conditions for such a clustering are determined. Measured temperatures have been found in the range of 5.5 - 6.0 MeV whereas density values of 0.3 - 0.4 times the saturation density are deduced, i.e., 0.046 to 0.062 . Such a density domain is also predicted by constrained self-consistent mean field calculations. These results constitute a benchmark for alpha clustering from self-conjugate nuclei in relation to descriptions of stellar evolution and supernovae.

    Comments:
    7 pages, 3 figures. arXiv admin note: text overlap with arXiv:1602.05827, arXiv:1603.01114
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2110.06583 [pdf]
    Symmetry(2021)·0 citations
  4. 04

    [Submitted on 13 Oct 2021] (cross-list from hep-ph)

    Fixed particle number constraint in a simple model of a thermal expanding system and collisions at the LHC

    M.D. Adzhymambetov🇺🇦 · S.V. Akkelin🇺🇦 · Yu.M. Sinyukov🇺🇦

    Two-boson momentum correlations at fixed particle number constraint are studied in a simple analytically solvable model of a thermal expanding system. We show that the increase of expansion rate, as well as increase of particle multiplicity, enhances the ground-state contribution to particle momentum spectra and leads to suppression of the Bose-Einstein momentum correlations. The relations of these findings to the multiplicity-dependent measurements of the Bose-Einstein momentum correlations in high-multiplicity collision events at the LHC are discussed.

    Comments:
    21 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2110.06824 [pdf]
    PRD(2022)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE