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Nuclear Theory·nucl-th

Thursday·October 7, 2021

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 01

    [Submitted on 6 Oct 2021]

    Phenomenological developments for event-by-event fluctuations of conserved charges

    Volodymyr Vovchenko🇺🇸

    A brief overview of the recent developments concerning theoretical description of event-by-event fluctuations in heavy-ion collisions is presented, with an emphasis on the role of exact conservation laws and calculations based on relativistic hydrodynamics.

    Comments:
    11 pages, 3 figures. Proceedings of CPOD 2021
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2110.02446 [pdf]
    PoS(2022)·8 citations
  2. 02

    [Submitted on 6 Oct 2021]

    Thermonuclear 17O(n,gamma)18O reaction rate and its astrophysical implications

    Li-Yong Zhang · Jian-Jun He · Motohiko Kusakabe · Zhen-Yu He · Toshitaka Kajino

    A new thermonuclear O(,)O rate is derived based on a complete calculation of the direct-capture (DC) and resonant-capture contributions, for a temperature region up to 2 GK of astrophysical interest. We have firstly calculated the DC and subthreshold contributions in the energy region up to 1 MeV, and estimated the associated uncertainties by a Monte-Carlo approach. It shows that the present rate is remarkably larger than that adopted in the JINA REACLIB in the temperature region of 0.01 2 GK, by up to a factor of 80. The astrophysical impacts of our rate have been examined in both -process and -process models. In our main -process model which simulates flash-driven convective mixing in metal deficient asymptotic giant branch stars, both O and F abundances in interpulse phases are enhanced dramatically by factors of -- due to the new larger O(,)O rate. It shows, however, that this reaction hardly affects the weak -process in massive stars since the O abundance never becomes significantly large in the massive stars. For the -process nucleosynthesis, we have studied impacts of our rate in both the collapsar and neutron burst models, and found that the effect can be neglected, although an interesting "loophole" effect is found owing to the enhanced new rate, which significantly changes the final nuclear abundances if fission recycling is not involved in the model, however, these significant differences are almost completely washed out if the fission recycling is considered.

    Comments:
    27 pages, 28 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2110.02447 [pdf]
    ApJ(2022)·6 citations
  3. 03

    [Submitted on 5 Oct 2021]

    A compact formula for the quantum fluctuations of energy

    Rajeev Singh🇵🇱

    A formula to calculate the quantum fluctuations of energy in small subsystems of a hot and relativistic gas is derived. We find an increase in fluctuations for subsystems of small sizes, but we agrees with the energy fluctuations in the canonical ensemble if the size is large enough. Not only one can use our expression to find the limit of the concepts of energy density or fluid element in connection to relativistic heavy-ion collisions, but also in other areas of physics where one studies matter with high temperature and velocity.

    Comments:
    Presented at The 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman (HADRON2021), July 26 to 31, 2021 (Online)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2110.02727 [pdf]
    Rev.Mex.Fis.Suppl.(2022)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE