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Nuclear Theory·nucl-th

Wednesday·November 4, 2020

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    [Submitted on 2 Nov 2020]

    Dark matter admixed neutron star properties in the light of gravitational wave observations: a two fluid approach

    Arpan Das🇵🇱 · Tuhin Malik🇮🇳 · Alekha C. Nayak🇮🇳

    We consider the effect of density dependent dark matter on the neutron star mass, radius, and tidal deformability. Nuclear matter (normal matter) as well as the fermionic dark matter sector is considered in a mean field model. We adopt the two fluid formalism to investigate the effect of dark matter on the neutron star properties. In the two fluid picture, there is no direct interaction between the dark matter and the nuclear matter. Rather these two sectors interact only through gravitational interaction. The nuclear matter sector is described by the meson interaction in the "FSU2R" parameterization. In the dark matter sector, we use the Bayesian parameter optimization technique to fix the unknown parameters in the dark matter equation of state. In the two fluid picture, we solve the coupled Tolman-Oppenheimer-Volkoff (TOV) equations to obtain the mass and radius of dark matter admixed neutron stars (DANSs). We also estimate the effect of the density dependent dark matter sector on the tidal deformability of dark matter admixed neutron stars (DANSs).

    Comments:
    17 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2011.01318 [pdf]
    PRD(2022)·85 citations
  2. 02

    [Submitted on 2 Nov 2020]

    Complete and incomplete fusion of Li projectiles on heavy targets

    M.R. Cortes · J. Rangel · J.L. Ferreira · J. Lubian · L.F. Canto

    We present a detailed discussion of a recently proposed method to evaluate complete and incomplete fusion cross sections for weakly bound systems. The method is applied to collisions of Li projectiles on different heavy targets, and the results are compared with the available data. The overall agreement between experiment and theory is fairly good.

    Comments:
    18 pages, 18 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2011.01327 [pdf]
    PRC(2020)·32 citations
  3. 03

    [Submitted on 3 Nov 2020]

    Relativistic non-resistive viscous magnetohydrodynamics from the kinetic theory:a relaxation time approach

    Ankit Kumar Panda🇮🇳 · Ashutosh Dash🇮🇳 · Rajesh Biswas🇮🇳 · Victor Roy🇮🇳

    We derive the relativistic non-resistive, viscous second-order magnetohydrodynamic equations for the dissipative quantities using the relaxation time approximation. The Boltzmann equation is solved for a system of particles and antiparticles using Chapman-Enskog like gradient expansion of the single-particle distribution function truncated at second order. In the first order, the transport coefficients are independent of the magnetic field. In the second-order, new transport coefficients that couple magnetic field and the dissipative quantities appear which are different from those obtained in the 14-moment approximation \cite{Denicol:2018rbw} in the presence of a magnetic field. However, in the limit of the weak magnetic field, the form of these equations are identical to the 14-moment approximation albeit with a different values of these coefficients. We also derive the anisotropic transport coefficients in the Navier-Stokes limit.

    Comments:
    20 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Fluid Dynamics (physics.flu-dyn); Plasma Physics (physics.plasm-ph)
    arXiv:
    2011.01606 [pdf]
    JHEP(2021)·60 citations
  4. 04

    [Submitted on 2 Nov 2020]

    Wigner-Wilkins neutron/nucleus scattering kernel quantum-mechanically derived

    J. A. Grzesik

    We undertake herein to derive the Wigner-Wilkins [W-W] neutron/nucleus scattering kernel, a foundation stone in neutron thermalization theory, on the basis of a self-contained calculation in quantum mechanics. Indeed, a quantum-mechanical derivation of the W-W kernel is available in the literature, cited below, but it is, in our opinion, robbed of conviction by being couched in terms of an excessive generality. Here, by contrast, we proceed along a self-contained route relying on the Fermi pseudopotential and a first-order term in a time-dependent Born approximation series. Our calculations are fully explicit at every step and, in particular, we tackle in its every detail a final integration whose result is merely stated in the available literature. Furthermore, and perhaps the most important point of all, we demonstrate that the quantum-mechanical W-W kernel outcome is identical down to the last iota with its classical antecedent, classical not only by virtue of historical precedence but also by being based on classical Newtonian mechanics.

    Comments:
    v3--missing eq. no. (38) supplied; v2 eq. nos. (38) on, and all refs. thereto, advanced by 1; stray right parenth in 1st line args of eqs (35-40) (new enum) removed; 1st line args in eqs (37-38) (new enum) more perspicuously arranged; v4--ref. 10 framed in sharper focus; two minor textual infelicities repaired
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2011.01743 [pdf]
    Nucl.Sci.Eng.(2023)·0 citations
  5. 05

    [Submitted on 3 Nov 2020]

    Potential roots of the deep sub-barrier heavy-ion fusion hindrance phenomenon

    P.W. Wen🇷🇺 · C.J. Lin🇨🇳 · R.G. Nazmitdinov🇷🇺 · S.I. Vinitsky🇷🇺 · O. Chuluunbaatar🇷🇺 · A.A. Gusev🇷🇺 · A.K. Nasirov🇷🇺 · H.M. Jia🇨🇳 · A. Gozdz🇵🇱

    We analyse the origin of the unexpected deep sub-barrier heavy-ion fusion hindrance in 64Ni+100Mo and 28Si+64Ni recations. Our analysis is based on the improved coupled-channels approach, implemented by means of the finite element method. With the aid of the Woods-Saxon potential the experimental cross sections and the S-factors of these reactions are remarkably well reproduced. We found that the account on the non-diagonal matrix elements of the coupling matrix, traditionally neglected in the conventional coupled-channels approaches in setting the left boundary conditions inside the potential pocket, and its minimal value are crucially important for the interpretation experimental data. Within our approach we found a good agreement with the experimental data for the S-factor of the fusion reaction 12C+12C, which has no a pronounced maximum for this system.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2011.01806 [pdf]
    PRC(2021)·16 citations
  6. 06

    [Submitted on 3 Nov 2020]

    Electric dipole moments of three-nucleon systems in the pionless effective field theory

    Zichao Yang🇺🇸 · Emanuele Mereghetti🇺🇸 · Lucas Platter🇺🇸 · Matthias R. Schindler🇺🇸 · Jared Vanasse🇺🇸

    We calculate the electric dipole moments (EDMs) of three-nucleon systems at leading order in pionless effective field theory. The one-body contributions that arise from permanent proton and neutron EDMs and the two-body contributions that arise from CP-odd nucleon-nucleon interactions are taken into account. Neglecting the Coulomb interaction, we consider the triton and He, and also investigate them in the Wigner-SU(4) symmetric limit. We also calculate the electric dipole form factor and find numerically that the momentum dependence of the electric dipole form factor in the Wigner limit is, up to an overall constant (and numerical accuracy), the same as the momentum dependence of the charge form factor.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2011.01885 [pdf]
    PRC(2021)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE