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Nuclear Theory·nucl-th

Thursday·October 24, 2024

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 22 Oct 2024]

    A Machine Learning Approach to Trapped Many-Fermion Systems

    Paulo F. Bedaque · Hersh Kumar · Andy Sheng

    We apply a variational Ansatz based on neural networks to the problem of spin- fermions in a harmonic trap interacting through a short distance potential. We showed that standard machine learning techniques lead to a quick convergence to the ground state, especially in weakly coupled cases. Higher couplings can be handled efficiently by increasing the strength of interactions during "training".

    Comments:
    8 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); cond-mat.dis-nn (cond-mat.dis-nn); Quantum Physics (quant-ph)
    arXiv:
    2410.17383 [pdf]
    PRC(2025)·3 citations
  2. 02

    [Submitted on 22 Oct 2024]

    Subshell gaps and onsets of collectivity from proton and neutron pairing gap correlations

    José Nicolás Orce

    Throughout the nuclear chart, particle-hole correlations give rise to giant resonances and, together with the proton-neutron interaction, deformation and rotational bands. In order to shed light on many-body correlations in open-shell nuclei, I explore macroscopic properties that could manifest from the collective behavior of protons and neutrons. Intuitively, the correlation of proton and neutron Cooper pairs can be inferred from the respective pairing gaps, that can precisely be extracted from the AME 2020 atomic mass evaluation through odd-even atomic mass differences. This work shows that the combination of large and close-lying proton and neutron pairing gaps is sensitive to onsets of collectivity and subshell gaps in superfluid nuclei, away from major shell closures. Trends of reduced transition probabilities or B(E2) values -- which describe the collective overlap between the wave functions of initial and final nuclear states -- are revealed in overall agreement with data. Specially interesting is the peak of collectivity in the tin isotopes at Sn, instead of at midshell, as expected by large-scale shell-model calculations; a situation that has astounded the nuclear physics community for quite some time.

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2410.17436 [pdf]
    Atom.Data Nucl.Data Tabl.(2025)·1 citation
  3. 03

    [Submitted on 22 Oct 2024]

    Production of double strange hypernuclei and exotic nuclei in central Au+Au collisions at =3 GeV

    N. Buyukcizmeci🇹🇷 · T. Reichert🇩🇪 · A.S. Botvina🇩🇪 · M. Bleicher🇩🇪

    We extend the theoretical approach which includes the dynamical and statistical stages for the description of the nucleosynthesis in central collisions of relativistic ions. Previously, this approach was successfully applied to describe experimental data on both normal nuclei and single strange hypernuclei production in the GSI and RHIC-BES energy range. We predict the multiplicities of double strange hypernuclei up to H and further intermediate mass nuclei up to Be for Au+Au central collisions at =3 GeV, recently explored by the STAR experiments. These new nuclei can be identified by the measurement of the correlated particles coming after their decay. Such observations are a crucial test for the nucleosynthesis mechanism.

    Comments:
    7 pages, 4 figures, submitted to Eur. Phys. J. A
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2410.17449 [pdf]
    EPJA(2025)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE