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Nuclear Theory·nucl-th

Thursday·July 18, 2024

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 16 Jul 2024]

    Breakup dynamics of a neutron-halo projectile on heavy target at deep sub-barrier energies

    B. Mukeru · T. Sithole · Lauro Tomio

    By studying the total fusion and breakup cross-sections in the interaction of the neutron-halo projectile on the lead target Pb, it is shown that, even for the neutron-halo projectile, the breakup channel remains the most dominant reaction channel at sub-barrier energies, following a characteristic behavior that was also previously verified for the case of the proton-halo projectile . This feature is found to emanate from the enhancement of the breakup cross-section, due to the continuum-continuum couplings coming exclusively from its Coulomb component. We further speculate that the enhancement of the Coulomb breakup cross-section at sub-barrier incident energies by the continuum-continuum couplings could be associated with the projectile breaking up on the outgoing trajectory, provided these couplings can be proven to delay the breakup process.

    Comments:
    8 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2407.12129 [pdf]
    J.Phys.G(2024)·0 citations
  2. 02

    [Submitted on 16 Jul 2024]

    On a possible H hypernucleus with HAL QCD interaction

    Igor Filikhin🇺🇸 · Roman Ya. Kezerashvili🇺🇸 · Branislav Vlahovic🇺🇸

    Within the framework of the Faddeev formalism in configuration space, we investigate bound states in the system with total isospin and . The recently proposed lattice HAL QCD potential in the channel does not support either or bound states. The HAL QCD potential in the channel suggests the bound states for and systems. However, the binding energies are highly sensitive to variations of the enhancement factor , and the system is extremely strongly bound in the state . Considering a spin-averaged potential % for the state yields a bound state for H hypernucleus with the binding energy (BE) 14.9 MeV when . The evaluation of the BE for the , three-body state results in 5.47 MeV. %Also, We evaluated the BE for the , three-body state as 5.47 MeV. Additionally, calculations using our approach confirm the bound states for the ( and ) system previously predicted with the Yukawa-type potential motivated by the QCD van der Waals attractive force, mediated by multi-gluon exchanges.

    Comments:
    6 Pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2407.12190 [pdf]
    PRD(2024)·17 citations
  3. 03

    [Submitted on 17 Jul 2024]

    Bulk viscosity of two-color superconducting quark matter in neutron star mergers

    Mark Alford🇺🇸 · Arus Harutyunyan🇦🇲 · Armen Sedrakian🇵🇱 · Stefanos Tsiopelas🇵🇱

    We study the bulk viscosity of moderately hot and dense, neutrino-transparent color superconducting quark matter arising from weak-interaction-driven direct URCA processes. The quark matter is modeled using the Nambu--Jona-Lasinio model improved to account for vector and 't Hooft interactions as well as antisymmetric pairing among the red/green up and down quarks. The unpaired excitations are the strange quarks and the blue up or down quarks. We compute the relaxation rates associated with and -quark decay and electron capture processes on quark for blue color. The resulting bulk viscosity for density oscillations in the 1--10\,kHz range shows a resonant peak at , and the damping time may drop below 10 ms. This is short enough to affect the postmerger evolution and is very similar to the damping predicted in nuclear matter.

    Comments:
    v2: 6 pages + 4 figures main text, 2 pages + 2 figures supplemental material. Matches version published in Phys. Rev. D. Letters
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2407.12493 [pdf]
    PRD(2024)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE