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Nuclear Theory·nucl-th

Friday·April 1, 2022

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    [Submitted on 31 Mar 2022]

    Pasta properties of the neutron star within effective relativistic mean-field model

    Vishal Parmar · H. C. Das · Ankit Kumar · Ankit Kumar · M. K. Sharma · P. Arumugam · S. K. Patra

    We study the properties of pasta structures and their influence on the neutron star observables employing the effective relativistic mean-field (E-RMF) model. The compressible liquid drop model is used to incorporate the finite size effects, considering the possibility of nonspherical structures in the inner crust. The unified equation of states are constructed for several E-RMF parameters to study various properties such as pasta mass and thickness in the neutron star's crust. The majority of the pasta properties are sensitive to the symmetry energy in the subsaturation density region. Using the results from Monte Carlo simulations, we estimate the shear modulus of the crust in the context of quasiperiodic oscillations from soft gamma-ray repeaters and calculate the frequency of fundamental torsional oscillation mode in the inner crust. Global properties of the neutron star such as mass-radius profile, the moment of inertia, crustal mass, crustal thickness, and fractional crustal moment of inertia are worked out. The results are consistent with various observational and theoretical constraints.

    Comments:
    16 pages, 10 figures, 3 tables, Published in Phys Rev. D. The unified equation of states are available on GitHub (https://github.com/hcdas/Unfied_pasta_eos)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2203.16827 [pdf]
    PRD(2022)·28 citations
  2. 02

    [Submitted on 31 Mar 2022]

    Quasielastic Charged-Current Neutrino-Nucleus Scattering with Nonrelativistic Nuclear Energy Density Functionals

    Kyungsik Kim🇰🇷 · Hana Gil🇰🇷 · Chang Ho Hyun🇰🇷

    Charged-current neutrino-nucleus scattering is studied in the quasielastic region with the KIDS (Korea-IBS-Daegu-SKKU) nuclear energy density functional. We focus on the uncertainties stemming from the axial mass and the in-medium effective mass of the nucleon. Comparing the result of theory to the state-of-the-art data from MiniBooNE, T2K, and MINERA, we constrain the axial mass and the effective mass that are compatible with the data. We find that the total cross section is insensitive to the effective mass, so the axial mass could be determined independently of the uncertainty in the effective mass. Differential cross sections at different kinematics are, on the other hand, sensitive to the effective mass as well as the axial mass. Within the uncertainty of the axial mass constrained from the total cross section, dependence on the effective mass is examined. As a result we obtain the axial mass and the effective mass that are consistent with the experimental data.

    Comments:
    13 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2203.16841 [pdf]
    PLB(2022)·15 citations
  3. 03

    [Submitted on 31 Mar 2022]

    Assessing the ultracentral flow puzzle in hydrodynamic modeling of heavy-ion collisions

    A. V. Giannini🇧🇷 · M. N. Ferreira🇧🇷 · M. Hippert🇺🇸 · D. D. Chinellato🇧🇷 · G. S. Denicol🇧🇷 · M. Luzum🇧🇷 · J. Noronha🇺🇸 · T. Nunes da Silva🇧🇷 · J. Takahashi🇧🇷

    An outstanding problem in heavy-ion collisions is the inability for models to accurately describe ultra-central experimental flow data, despite that being precisely the regime where a hydrodynamic description should be most applicable. We reassess the status of this puzzle by computing the flow in ultra-central collisions obtained from multiple recent Bayesian models that were tuned to various observables in different collision systems at typical centralities. While central data can now be described with better accuracy than in previous calculations, tension with experimental observation remains and worsens as one goes to ultra-central collisions. Tuning the model parameters cannot remove this tension without destroying the fit at other centralities. As such, new elements are likely needed in the standard modeling of heavy-ion collisions.

    Comments:
    v2: 8 pages, 4 figures. Added new fig. 1; extended discussions in the "results" and "conclusions" sections. Conclusion unchanged. Matches version accepted by PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2203.17011 [pdf]
    PRC(2023)·21 citations
  4. 04

    [Submitted on 31 Mar 2022]

    Evolution of the statistical disintegration of finite nuclei toward high energy

    A.S. Botvina🇩🇪 · N. Buyukcizmeci🇹🇷 · M. Bleicher🇩🇪

    We develop a statistical approach for the description of complex nuclei formation from dynamically produced baryons in high energy heavy-ion reactions. We consider a finite highly-excited expanding nuclear system formed after central nucleus-nucleus collisions. This system is sub-divided into primary equilibrated nucleon clusters. The final nuclei are produced after the decay of these excited clusters. By the successful comparison with the FOPI experimental data we prove the possibility of such a local equilibrium in nuclear matter with the temperature corresponding to the phase coexistence region. The regularities obtained in this new nuclei production mechanism are shown.

    Comments:
    13 pages, 12 figures, to be submitted to Phys. Rev. C 2022. arXiv admin note: text overlap with arXiv:2012.07679
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2203.17092 [pdf]
    PRC(2022)·16 citations
  5. 05

    [Submitted on 31 Mar 2022]

    Effects of a strong phase transition on supernova explosions, compact stars and their mergers

    Andreas Bauswein🇩🇪 · David Blaschke🇵🇱 · Tobias Fischer🇵🇱

    We outline a theoretical approach supporting strong phase transitions from normal nuclear matter to the deconfined quark-gluon plasma, in the equation of state (EOS) for compact star matter. Implications of this hypothesis are discussed for astrophysical applications. Special emphasis is devoted to potentially detectable signatures, which can be directly related with the occurrence of a sufficiently strong phase transition. Therefore, simulations of core-collapse supernovae and binary compact star mergers are considered, including the subsequent emission of gravitational waves and, in the case of supernova, in addition the neutrinos play the role of messengers.

    Comments:
    39 pages, 13 figures, contribution submitted on 20.02.2022 to the Book "Astrophysics in the XXI Century with Compact Stars", edited by Cesar Augusto Zen Vasconcellos and Fridolin Weber, World Scientific
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2203.17188 [pdf]
    Astrophysics in the XXI Century with Comp…·16 citations

Affiliations

first authorsco-authorsvia INSPIRE