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Nuclear Theory·nucl-th

Thursday·March 20, 2025

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 18 Mar 2025] (cross-list from physics.atom-ph)

    Electron capture of superheavy nuclei with realistic lepton wave functions

    A. Ravlić · P. Schwerdtfeger · W. Nazarewicz

    The superheavy nuclei push the periodic table of the elements and the chart of the nuclides to their limits, providing a unique laboratory for studies of the electron-nucleus interactions. The most important weak decay mode in known superheavy nuclei is electron capture (EC). In the standard calculations of EC, the lepton wave functions are usually considered in the lowest-order approximation. In this work, we investigate the sensitivity of EC rates on the choice of the electron wave functions by (i) assuming the single-particle approximation for the electron wave functions, and (ii) carrying out Dirac-Hartree-Fock (DHF) calculations. The nuclear response is generated based on the state-of-the-art quasiparticle random phase approximation employing relativistic nuclear energy density functional theory. We show that using the improved lepton wave functions reduces the EC rates up to 40\% in the superheavy nucleus oganesson (). Interestingly, because of screening effects, the difference between the EC rates obtained with the DHF and single-particle calculations is fairly small.

    Comments:
    12 pages, 8 figures, submitted to Phys. Rev. A
    Subjects:
    Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th)
    arXiv:
    2503.14613 [pdf]
    PRC(2025)·4 citations
  2. 05

    [Submitted on 19 Mar 2025] (cross-list from astro-ph.SR)

    Using Lithium and Beryllium to Study Structure and Evolution of Rotating Stars

    Wuming Yang · Haibo Yuan · Yaqian Wu · Shaolan Bi · Zhijia Tian

    The chemical composition of the Sun is still a highly controversial issue. No solar model has yet been able to simultaneously reproduce the solar lithium and beryllium abundances, along with helioseismic results, including the rotation profile. Lithium and beryllium are fragile elements that are highly sensitive to the physical conditions, as well as to transport and mixing processes within and below the convective zone (CZ). Uncovering the transport mechanisms responsible for the depletion of Li and Be in the Sun is crucial for using them as tools to understand stellar interiors and the associated transport and mixing processes. We constructed rotating solar models based on Magg's abundance scale, incorporating the effects of convective overshoot and magnetic fields. The rotating model exhibits superior sound speed and density profile and successfully reproduces the observed ratios and . It also matches the seismically inferred CZ depth, surface helium abundance, and rotation profile, as well as the detected Li and Be abundances and neutrino fluxes within . The depletion of Li is dominated by convective overshoot and rotational mixing, while Be depletion is primarily driven by gravitational settling and rotational mixing. The presence of the tachocline accelerates Li depletion but slows down Be depletion. These distinct depletion mechanisms result in the surface abundances of Li and Be evolving differently over time.

    Comments:
    Accepted for publication in ApJ
    Subjects:
    Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2503.14804 [pdf]
    1 citation
  3. 06

    [Submitted on 19 Mar 2025] (cross-list from hep-ph)

    Study of hadron interactions and compositeness

    Tetsuo Hyodo🇯🇵

    Plenty of hadrons have been established experimentally, yet the nonperturbative nature of the strong interaction complicates a comprehensive understanding of their internal structure, particularly for exotic hadrons that extend beyond conventional mesons and baryons. One prominent candidate for the internal structure of exotic hadrons is the hadronic molecule, a loosely bound system of hadrons analogous to atomic nuclei. Understanding such systems requires precise knowledge of hadron interactions, which traditional scattering experiments struggle to provide, especially in the low-energy region. Recent advances, including precise baryon-baryon interaction measurements, femtoscopy techniques that probe momentum correlations between particles, and first-principles lattice QCD calculations, have significantly improved our understanding of hadron interactions. Here, we review these recent developments, demonstrate the successful application of femtoscopy to antikaon-nucleon interactions, utilize the concept of compositeness to quantify the hadronic molecular component of the Lambda(1405), and discuss both experimental and theoretical prospects, including future studies at J-PARC.

    Comments:
    9 pages, 3 figures, Talk given at the 4th J-PARC symposium (J-PARC2024), Oct. 14-18, 2024, Mito, Japan
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2503.15376 [pdf]
    3 citations

Affiliations

first authorsco-authorsvia INSPIRE