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Nuclear Theory·nucl-th

Thursday·May 6, 2021

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 4 May 2021]

    Impact of momentum resolution on factorial moments due to power-law correlations between particles

    Subhasis Samanta🇵🇱 · Tobiasz Czopowicz🇵🇱 · Marek Gazdzicki🇵🇱

    The effect of momentum resolution on factorial moments due to the power-law correlation function is studied. The study is motivated by the search for the critical point of the strongly interacting matter in heavy-ion collisions using the intermittency method. We observe that factorial moments are significantly affected by the finite momentum resolution. The effect is superficially significant compared to intuitive expectations. The results depend on the power of the correlation function and the number of uncorrelated particles.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2105.01763 [pdf]
    J.Phys.G(2021)·9 citations
  2. 02

    [Submitted on 5 May 2021]

    Necessity of selfconsistent calculations for the electromagnetic field in probing the nuclear symmetry energy using pion observables in heavy-ion collisions

    Gao-Feng Wei🇨🇳 · Chang Liu🇨🇳 · Xin-Wei Cao🇨🇳 · Qi-Jun Zhi🇨🇳 · Wen-Jun Xiao🇨🇳 · Chao-Yun Long🇨🇳 · Zheng-Wen Long🇨🇳

    Within an isospin- and momentum-dependent transport model, we investigate the necessity of selfconsistent calculations for the electromagnetic field in probing the nuclear symmetry energy using pion observables in heavy-ion collisions at intermediate energies. To this end, we perform the Ru + Ru collisions at 400 MeV/nucleon with two calculations scenarios for the electromagnetic field including the selfconsistent calculation and the most used Liénard-Wiechert formula, while the latter is a simplified one of the complete Liénard-Wiechert formula by neglecting the radiation field for practical calculations in heavy-ion collisions at intermediate and/or relativistic energies. As a comparison, we also consider the static Coulomb field formula for calculations of the electromagnetic field in heavy-ion collisions. It is shown that the most used simplified Liénard-Wiechert formula is not enough for the electromagnetic field calculation because the absent radiation field in this formula also affects significantly the charged pions as well as their ratio. Moreover, we also examine effects of the electromagnetic field in these scenarios on the double ratio of two isobar reaction systems of Ru + Ru and Zr + Zr at 400 MeV/nucleon. It is shown that the double ratio of two reactions tends to be less affected by the electromagnetic field calculation scenario and thus can still be an effective probe of the nuclear symmetry energy in heavy-ion collisions. Therefore, according to these findings, it is suggested that the selfconsistent calculation for the electromagnetic field should be carefully taken into account when using the pion observables to probe the nuclear symmetry energy in heavy-ion collisions.

    Comments:
    7 pages, 6 figures. Accepted for publication in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2105.01866 [pdf]
    PRC(2021)·4 citations
  3. 03

    [Submitted on 5 May 2021]

    Deep crustal heating for realistic compositions of thermonuclear ashes

    Nikolay N. Shchechilin🇷🇺 · Mikhail E. Gusakov🇷🇺 · Andrey I. Chugunov🇷🇺

    The deep crustal heating, associated with exothermal nuclear reactions, is believed to be a key parameter for describing the thermal evolution of accreting neutron stars. In this paper, we present the first thermodynamically consistent calculations of the crustal heating for realistic compositions of thermonuclear ashes. In contrast to previous studies based on the traditional approach, we account for neutron hydrostatic/diffusion (nHD) equilibrium condition imposed by superfluidity of neutrons in a major part of the inner crust and rapid diffusion in the remaining part of the inner crust. We apply a simplified reaction network to model nuclear evolution of various multi-component thermonuclear burning ashes (superburst, KEPLER, and extreme rp-process ashes) in the outer crust and calculate the deep crustal heating energy release Q, parametrized by the pressure at the outer-inner crust interface, P_{oi}. Using the general thermodynamic arguments, we set a lower limit on Q, Q>0.13-0.2 MeV per baryon (an actual value depends on the ash composition and the employed mass model).

    Comments:
    12 pages, 8 figures. Updated to AME2020. Accepted for publication in MNRAS
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2105.01991 [pdf]
    MNRAS(2021)·23 citations
  4. 04

    [Submitted on 4 May 2021]

    Quantum baryon number fluctuations in subsystems of a hot and dense relativistic gas of fermions

    Arpan Das🇵🇱 · Wojciech Florkowski🇵🇱 · Radoslaw Ryblewski🇵🇱 · Rajeev Singh🇵🇱

    Quantum features of the baryon number fluctuations in subsystems of a hot and dense relativistic gas of fermions are analyzed. We find that the fluctuations in small systems are significantly increased compared to their values known from the statistical physics, and diverge in the limit where the system size goes to zero. The numerical results obtained for a broad range of the thermodynamic parameters expected in heavy-ion collisions are presented. They can be helpful to interpret and shed new light on the experimental data.

    Comments:
    Journal version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2105.02125 [pdf]
    Acta Phys.Polon.B(2022)·12 citations

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first authorsco-authorsvia INSPIRE