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Nuclear Theory·nucl-th

Monday·September 23, 2024

3 papers—2 primary·1 cross-listed

All3Primary2Cross-lists1
  1. 01

    [Submitted on 20 Sept 2024]

    Theoretical study of the correlation function

    Yuki Kamiya🇩🇪 · Asanosuke Jinno🇯🇵 · Tetsuo Hyodo🇯🇵 · Akira Ohnishi🇯🇵

    We study - () momentum correlation functions in the high-energy nuclear collisions to investigate the nature of the interactions. We employ the folding potential based on the lattice QCD interactions to compute the correlation function. The potential supports a Coulomb-assisted bound state in the channel, while the channel is unbound. To examine the sensitivity of the correlation function to the nature of the interaction, we vary the potential strength simulating stronger and weaker interactions. The result of the correlation function is sensitive to the existence of the bound state in the channel, and the characteristic behavior of the bound state remains also in the correlation with the Coulomb interaction. The effect of the repulsive core of the potential can be found in the correlation from the small source as the distinctive dip in the intermediate momentum region.

    Comments:
    7 pages, 6 figures, published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2409.13207 [pdf]
    PRC(2026)·15 citations
  2. 02

    [Submitted on 20 Sept 2024]

    Re examination of the effect of Pairing Gaps on Gamow Teller Strength Distributions and beta decay Rates

    Jameel Un Nabi · Muhammad Riaz · Arslan Mehmood

    Beta decay is one of the key factors to understand the r process and evolution of massive stars. The Gamow Teller (GT) transitions drive the beta decay process. We employ the proton neutron quasiparticle random phase approximation (on QRPA) model to calculate terrestrial and stellar beta decay rates for 50 top ranked nuclei possessing astrophysical significance according to a recent survey. The model parameters of the on QRPA model affect the predicted results of beta decay. The current study investigates the effect of nucleon nucleon pairing gaps on charge changing transitions and the associated beta decay rates. Three different values of pairing gaps, namely TF, 3TF and 5TF, were used in our investigation. It was concluded that both GT strength distributions and half lives are sensitive to pairing gap values. The 3TF pairing gap scheme, in our chosen nuclear model, resulted in best prediction with around 80 percent of the calculated half-lives within a factor 10 of the measured ones. The 3TF pairing scheme also led to calculation of biggest beta decay rates in stellar matter.

    Comments:
    32 pages 8 Tables 7 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2409.13264 [pdf]
    Universe(2024)·5 citations
  3. 03

    [Submitted on 20 Sept 2024] (cross-list from hep-ph)

    Can charm fluctuation be a better probe to study QCD critical point?

    Kangkan Goswami🇮🇳 · Kshitish Kumar Pradhan🇮🇳 · Dushmanta Sahu🇮🇳 · Jayanta Dey🇮🇳 · Raghunath Sahoo🇮🇳

    We study the diffusion properties of an interacting hadron gas and evaluate the diffusion coefficient matrix for the baryon, strange, electric, and charm quantum numbers. For the first time, this study sheds light on the charm current and estimates the diffusion matrix coefficient for the charmed states by treating them as a part of the quasi-thermalized medium. We explore the diffusion matrix coefficient as a function of temperature and center-of-mass energy. A van der Waals-like interaction is assumed between the hadrons, including attractive and repulsive interactions. The calculation of diffusion coefficients is based on relaxation time approximation to the Boltzmann transport equation. A good agreement with available model calculations is observed in the hadronic limit. To conclude the study, we discuss, with a detailed explanation, that charm fluctuation is expected to be a better tool for probing the QCD critical point.

    Comments:
    Same as the published version in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2409.13255 [pdf]
    PRD(2025)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE