PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·September 30, 2020

14 papers—5 primary·9 cross-listed

All14Primary5Cross-lists9
  1. 01

    [Submitted on 28 Sept 2020]

    Bayesian inference of dense matter EOS encapsulating a first-order hadron-quark phase transition from observables of canonical neutron stars

    Wen-Jie Xie🇨🇳 · Bao-An Li🇺🇸

    [Purpose:] We infer the posterior probability distribution functions (PDFs) and correlations of nine parameters characterizing the EOS of dense neutron-rich matter encapsulating a first-order hadron-quark phase transition from the radius data of canonical NSs reported by LIGO/VIRGO, NICER and Chandra Collaborations. We also infer the quark matter (QM) mass fraction and its radius in a 1.4 M NS and predict their values in more massive NSs. [Method:] Meta-modelings are used to generate both hadronic and QM EOSs in the Markov-Chain Monte Carlo sampling process within the Bayesian statistical framework. An explicitly isospin-dependent parametric EOS for the matter in NSs at equilibrium is connected through the Maxwell construction to the QM EOS described by the constant speed of sound (CSS) model of Alford, Han and Prakash. [Results:] (1) The most probable values of the hadron-quark transition density and the relative energy density jump there are and at 68\% confidence level, respectively. The corresponding probability distribution of QM fraction in a 1.4 M NS peaks around 0.9 in a 10 km sphere. Strongly correlated to the PDFs of and , the PDF of the QM speed of sound squared peaks at , and the total probability of being less than 1/3 is very small. (2) The correlations between PDFs of hadronic and QM EOS parameters are very weak. [Conclusions:] The available astrophysical data considered together with all known EOS constraints from theories and terrestrial nuclear experiments prefer the formation of a large volume of QM even in canonical NSs.

    Comments:
    Added Fig.5 and the associated discussions/references regarding effects of the Seidov condition for first-order phase transition. Physical Review C in press
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex)
    arXiv:
    2009.13653 [pdf]
    PRC(2021)·74 citations
  2. 02

    [Submitted on 29 Sept 2020]

    Novel feature of doubly bubble nuclei in 50Z(N)82 region along with magicity and weakly bound structure

    M. Kumawat · G. Saxena · M. Kaushik · S. K. Jain · J. K. Deegwal · Mamta Aggarwal

    In this work, we identify a unique and novel feature of central density depletion in both proton and neutron named as doubly bubble nuclei in 50Z(N)82 region. The major role of 2d-3s single-particle (s.p.) states in the existence of halo and bubble nuclei is probed. The occupancy in s.p. state 3s leads to the extended neutron density distribution or halo while the unoccupancy results in the central density depletion. By employing the Relativistic Mean-Field (RMF) approach along with NL3* parameter, the separation energies, single-particle energies, pairing energies, proton, and neutron density profiles along with deformations of even-even nuclei are investigated. Our results are in concise with few other theories and available experimental data. Emergence on new shell closure and the magicity of conventional shell closures are explored systematically in this yet unknown region.

    Comments:
    13 figures, 18 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2009.13835 [pdf]
    IJMPE(2020)·2 citations
  3. 03

    [Submitted on 29 Sept 2020]

    Critical temperature of deconfinement in a constrained space using a bag model at vanishing baryon density

    Zonghou Han · Baoyi Chen · Yunpeng Liu

    The geometry of fireballs in relativistic heavy ion collisions is approximated by a static box, which is infinite in two directions while finite in the other direction. The critical temperature of deconfinement phase transition is calculated explicitly in the MIT bag model at vanishing baryon density. It is found that the critical temperature shifts to a value higher than that in an unconstrained space.

    Comments:
    8 pages, 4 figures, typos corrected and language improved (thanks to referees and editors), accepted by Chinese Physics Letters
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2009.13841 [pdf]
    Chin.Phys.Lett.(2020)·9 citations
  4. 04

    [Submitted on 29 Sept 2020]

    Radial profile of heavy quarks in jets in high-energy nuclear collisions

    Sa Wang🇨🇳 · Wei Dai🇨🇳 · Ben-Wei Zhang🇨🇳 · Enke Wang🇨🇳

    In high energy nuclear collisions, heavy flavor tagged jets are useful hard probes to study the properties of the quark-gluon plasma (QGP). In this talk, we present the first theoretical prediction of the meson radial distributions in jets relative to the jet axis both in p+p and Pb+Pb collisions at TeV, it shows a nice agreement with the available experimental data. The in-medium jet evolution in the study is described by a Monte Carlo transport model which has been incorporated with the initial events as input provided by the next-to-leading order (NLO) plus parton shower (PS) event generator SHERPA. In such evolution process, both elastic and inelastic parton energy loss in the hot and dense medium are taken into account. Within this same simulation framework, we predict different modification patterns of the radial profile of charm and bottom quarks in jets in Pb+Pb collisions: jet quenching effect will lead the charm quarks diffuse to lager radius while lead the bottom quarks distributed closer to jet axis.

    Comments:
    4 pages, 4 figures, Parallel talk presented at Hard Probes 2020
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2009.13959 [pdf]
    PoS(2021)·3 citations
  5. 05

    [Submitted on 29 Sept 2020]

    Light clusters in warm stellar matter: calibrating the cluster couplings

    Tiago Custódio🇵🇹 · Alexandre Falcão🇵🇹 · Helena Pais🇵🇹 · Constança Providência🇵🇹 · Francesca Gulminelli🇫🇷 · Gerd Röpke🇩🇪

    The abundances of light clusters within a formalism that considers in-medium effects are calculated using several relativistic mean-field models, with both density-dependent and density-independent couplings. Clusters are introduced as new quasiparticles, with a modified coupling to the scalar meson field. A comparison with experimental data from heavy ion collisions allows settling the model dependence of the results and the determination of the couplings of the light clusters to the meson fields. We find that extra experimental constraints at higher density are needed to convincingly pin down the density associated to the melting of clusters in the dense nuclear medium. The role of neutron rich clusters, such as He, in asymmetric matter is discussed.

    Comments:
    10 pages, 8 figures, and 1 table; accepted for publication in the EPJA Topical Issue "Light Clusters in Nuclei and Nuclear Matter: Nuclear Structure and Decay, Heavy Ion Collisions, and Astrophysics"
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2009.14035 [pdf]
    EPJA(2020)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE