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Nuclear Theory·nucl-th

Friday·June 14, 2024

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    [Submitted on 13 Jun 2024]

    MURCA driven Bulk viscosity in neutrino trapped baryonic matter

    Sreemoyee Sarkar🇮🇳 · Rana Nandi🇮🇳

    We examine bulk viscosity, taking into account trapped neutrinos in baryonic matter, in the context of binary neutron star mergers. Following the merging event, the binary star can yield a remnant compact object with densities up to nuclear saturation density and temperature upto MeV resulting in the retention of neutrinos. We employ two relativistic mean field models, NL3 and DDME2, to describe the neutrino-trapped baryonic matter. The dissipation coefficient is determined by evaluating the Modified URCA interaction rate in the dense baryonic medium, and accounting for perturbations caused by density oscillations. We observe the resonant behavior of bulk viscosity as it varies with the temperature of the medium. The bulk viscosity peak remains within the temperature range of MeV, depending upon the underlying equation of states and lepton fractions. This temperature range corresponds to the relevant domain of binary neutron star mergers. We also note that in presence of neutrinos in the medium the bulk viscosity peak shifts towards higher temperature and the peak value of bulk viscosity also changes. The time scale of viscous dissipation is dictated by the beta-off-equilibrium susceptibilities derived from the nuclear equation of state. The resulting viscous decay time scale ranges from milliseconds, which aligns with the order of magnitude of the post-merger object's survival time in some specific scenarios.

    Comments:
    27 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2406.08978 [pdf]
    EPJC(2024)·4 citations
  2. 02

    [Submitted on 13 Jun 2024]

    Elastic scattering on a quantum computer

    Muhammad Yusf🇺🇸 · Ling Gan · Cameron Moffat · Gautam Rupak

    Scattering probes the internal structure of quantum systems. We calculate the two-particle elastic scattering phase shift for a short-ranged interaction on a quantum computer. Short-ranged interactions with a large scattering length or shallow bound state describe a universality class that is of interest in atomic, condensed matter, nuclear, and particle physics. The phase shift is calculated by relating the ground state energy of the interacting particles in a harmonic trap. The relaxation method is used as the variational quantum eigensolver for the ground state calculation. Schmidt decomposition is used to reduce quantum circuits nominally requiring tens of qubits to 2-qubit circuits, thus reducing the noise in quantum measurements. Calculations in multi-particle systems with many-body interactions would benefit from this reduction of qubits in noisy quantum processors.

    Comments:
    9 pages, 2 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2406.09231 [pdf]
    PRC(2025)·13 citations
  3. 03

    [Submitted on 13 Jun 2024]

    Final-state interactions in neutrino-induced proton knockout from argon in MicroBooNE

    A. Nikolakopoulos🇺🇸 · A. Ershova🇫🇷 · R. González-Jiménez🇪🇸 · J. Isaacson🇺🇸 · A. M. Kelly🇺🇸 · K. Niewczas🇧🇪 · N. Rocco🇺🇸 · F. Sánchez🇨🇭

    Neutrino event generators make use of intranuclear cascade models (INCs), to predict the kinematics of hadrons produced in neutrino-nucleus interactions. We perform a consistent comparison of different INCs, by using the same set of events as input to the NEUT, NuWro, Achilles and INCL INCs. The inputs correspond to calculations of the fully differential single-proton knockout cross section, either in the distorted-wave impulse approximation (DWIA) or plane-wave impulse approximation (PWIA), both including realistic nuclear hole spectral functions. We compare the INC results to DWIA calculations with an optical potential, used extensively in the analysis of (e,e'p) experiments. We point out a systematic discrepancy between both approaches. We apply the INC results to recent MicroBooNE data. We assess the influence of the choice of spectral function, finding that large variations in realistic spectral functions are indistinguishable with present data. The data is underpredicted, with strength missing in the region where two-nucleon knockout and resonance production contribute. However, the data is underpredicted also in regions of low transverse missing momentum, where one-nucleon knockout dominates. The inclusion of the interference with two-body currents could lead to additional strength in this region.

    Comments:
    26 pages including appendices, comments welcome
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2406.09244 [pdf]
    PRC(2024)·17 citations
  4. 04

    [Submitted on 13 Jun 2024]

    Surface and curvature tensions of relativistic models

    Mariana Dutra · Odilon Lourenço · Débora P. Menezes

    In the present paper, we show a simple method to obtain fittings for the surface and curvature tensions. The method uses the nuclear mass of a spherical fully ionized atom and a simple expression for the binding energy such that a least square fit is found when confronted with the Atomic Mass Evaluation (AME) 2020. The fittings are then used to evaluate the pasta phase free energy per particle, which is confronted with the one obtained with a Thomas-Fermi fitting. The results are very encouraging and suggest that this recipe can be safely used whenever the surface and curvature tensions are necessary.

    Comments:
    7 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2406.09284 [pdf]
    J.Phys.G(2025)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE