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Nuclear Theory·nucl-th

Friday·June 17, 2022

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    [Submitted on 15 Jun 2022] (cross-list from gr-qc)

    Dynamical evolution of fermion-boson stars with realistic equations of state

    Joseph E. Nyhan🇺🇸 · Ben Kain🇺🇸

    Fermion-boson stars are mixtures of the ordinary nuclear matter of a neutron star and bosonic dark matter. We dynamically evolve fermion-boson stars for the first time using a realistic equation of state for nuclear matter. We use our dynamical solutions to make a detailed study of the evolution of weakly and strongly perturbed static solutions. As examples of our findings, we identify a region of parameter space where weakly perturbed unstable static solutions migrate to a stable configuration and we determine the criteria under which strongly perturbed stable static solutions will always move to a stable configuration instead of collapsing to a black hole.

    Comments:
    12 pages, 6 figures. arXiv admin note: text overlap with arXiv:2201.02274
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2206.07715 [pdf]
    PRD(2022)·17 citations
  2. 07

    [Submitted on 16 Jun 2022] (cross-list from hep-ph)

    Inverse Primakoff Scattering for Axionlike Particle Coupling

    C.-P. Wu🇨🇦 · C.-P. Liu🇹🇼 · Greeshma C.🇮🇳 · L. Singh🇮🇳 · J.-W. Chen🇹🇼 · H.-C. Chi🇹🇼 · M.K. Pandey🇹🇼 · H.T. Wong🇹🇼

    Axionlike particles (ALPs) can be produced in the Sun, and are considered viable candidates for the cosmological dark matter (DM). It can decay into two photons or interact with matter. We identify new inelastic channels of inverse Primakoff processes due to atomic excitation and ionization. Their cross sections are derived by incorporating full electromagnetic fields of atomic charge and current densities, and computed by well-benchmarked atomic many-body methods. Complementing data from the underground XENONnT and surface TEXONO experiments are analyzed. Event rates and sensitivity reaches are evaluated with respect to solar- and DM-ALPs. New parameter space in ALP couplings with the photons versus ALP masses in (1~eV10~keV) not previously accessible to laboratory experiments are probed and excluded with solar-ALPs. However, at regions where DM-ALPs have already decayed, there would be no ALP-flux and hence no interactions at the detectors in direct search experiments. No physics constraints can be derived. Future projects would be able to evade the stability bound and open new observable windows in (100~eV1~MeV) for DM-ALPs.

    Comments:
    1 table, 12 figures, V2 Published Version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2206.07878 [pdf]
    PRD(2023)·9 citations
  3. 08

    [Submitted on 16 Jun 2022] (cross-list from nucl-ex)

    Re-investigation of the interplay of fission modes and non-equilibrium fission processes in heavy actinide nuclei 249Bk and 257Md

    R. Dubey🇵🇱 · G. Kaur🇫🇷 · Abhishek Yadav🇮🇳 · N. Saneesh🇮🇳 · Akhil Jhingan🇮🇳 · P. Sugathan🇮🇳 · Tathagata Banerjee🇮🇹 · K.S. Golda🇮🇳 · Hardev Singh🇮🇳 · Meenu Thakur🇮🇳 · Ruchi Mahajan🇺🇸

    Measurements of mass and angular distributions of fission fragments from actinide nuclei 249Bk and 257Md, produced in fusion reactions 11B and 19F + 238238U, are presented. Experimentally observed mass ratio distributions indicate 'multi-chance fission' through the interplay of fission modes in the fission process, and they agree well with predictions from calculations using the GEF ('GEneral description of Fission observables') model code. Furthermore, to test the signatures of events from non-compound nuclear processes in the fission of 249Bk and 257Md nuclei, Monte Carlo statistical decay model calculations using GEMINI++ were performed for the measured mass distribution at all energies. For comparison purposes, the fission fragment mass distributions of neighboring heavy actinide nuclei, previously measured in the fission of 250Cf and 254Fm nuclei produced by 12C and 16O projectiles on a 238U target, are also presented. The measured angular anisotropy data for the 19F + 238U reaction differ from the results of the Transition State Model at energies below the fusion barrier. As a result of the present study, we suggest considering the interplay between K relaxation time, dynamic dissipation, and their influence on shell correction to understand the evolution of fission dynamics in heavy-ion-induced actinide nuclei

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2206.07903 [pdf]
    PLB(2024)·1 citation
  4. 09

    [Submitted on 16 Jun 2022] (cross-list from astro-ph.HE)

    Properties of pasta phases in catalyzed neutron stars

    H. Dinh Thi🇫🇷 · A. F. Fantina🇫🇷 · F. Gulminelli🇫🇷

    Exotic non-spherical configurations of nuclei, known as ``pasta" phases, are expected to be present at the bottom of the inner crust of a neutron star. We study the properties of these configurations in catalyzed neutron stars within a compressible liquid-drop model approach, with surface parameters optimized to reproduce experimental nuclear masses. Our results show that the properties of the pasta phases exhibit strong model dependence. To estimate the model uncertainties, a Bayesian analysis is performed, combining information from nuclear physics experiments and chiral perturbation theoretical calculations with astrophysical observations. The inferred posterior distributions are discussed, with particular focus on the effect of the low-density energy functional on the predictions.

    Comments:
    Proceedings of the International Workshop on Multi-facets of EOS and Clustering 2021; published in Il Nuovo Cimento C
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2206.07969 [pdf]
    Nuovo Cim.C(2022)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE