Nuclear Theory·nucl-th

Friday·February 18, 2022

8 papers—4 primary·4 cross-listed

01
[Submitted on 17 Feb 2022]
Effects of triaxiality and pairing interaction on fission barriers of actinide nuclei studied by density-dependence relativistic mean-field theory
Taiki Kouno · Chikako Ishizuka · Kazuki Fujio · Tsunenori Inakura · Satoshi Chiba
We employ density-dependent relativistic mean-field theory to study how the triaxiality and pairing interaction affect the inner fission barriers of actinide nuclei. It was found that triaxiality reduced the inner fission barriers and improved agreement with experimental values for many actinides. However, about 1-2 MeV discrepancy to the experimental values still remained for some of the considered nuclei. Such a discrepancy could be made further smaller by increasing the BCS pairing strength parameter. In this work, we demonstrated that adjusting the paring strength was effective to reproduce the experimental inner fission barriers as well as "pairing rotational energy" and binding energy in a consistent manner for nuclei where the effect of the triaxiality on the inner fission barriers was significant.
Comments:
13 pages, 6 figures, 3 tables, IJMPE accepted
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2202.08654 [pdf]
IJMPE(2022)·1 citation
02
[Submitted on 17 Feb 2022]
Is first-order relativistic hydrodynamics in general frame stable and causal for arbitrary interaction?
Rajesh Biswas🇮🇳 · Sukanya Mitra🇮🇳 · Victor Roy🇮🇳
We derive a first-order, stable and causal, relativistic hydrodynamic theory from the microscopic kinetic equation using the gradient expansion technique in a general frame. The general frame is introduced from the arbitrary matching conditions for hydrodynamic fields. The interaction is introduced in the relativistic Boltzmann equation through the momentum-dependent relaxation time approximation (MDRTA) with the proposed collision operator that preserves the conservation laws. We demonstrate here for the first time that not only the general frame choice, but also the momentum dependence of microscopic interaction rate, captured through MDRTA, is imperative for producing the essential field corrections that give rise to a causal and stable first-order relativistic theory.
Comments:
6 pages, 3 figures, Accepted for publication in Physical Review D Letter
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2202.08685 [pdf]
PRD(2022)·27 citations
03
[Submitted on 17 Feb 2022]
Effects of isoscalar- and isovector-scalar meson mixing on neutron star structure
Fan Li🇨🇳 · Bao-Jun Cai🇨🇳 · Ying Zhou🇨🇳 · Wei-Zhou Jiang🇮🇹 · Lie-Wen Chen🇨🇳
Based on the accurately calibrated interaction FSUGold, we show that including isovector scalar $δ$ meson and its coupling to isoscalar scalar $σ$ meson in the relativistic mean field (RMF) model can soften the symmetry energy $E_{sym} (n)$ at intermediate densities while stiffen the $E_{sym} (n)$ at high densities. We find this new RMF model can be simultaneously compatible with (1) the constraints on the equation of state of symmetric nuclear matter at suprasaturation densities from flow data in heavy-ion collisions, (2) the neutron skin thickness of $^{208}$ Pb from the PREX-II experiment, (3) the largest mass of neutron star (NS) reported so far from PSR J0740+6620, (4) the limit of $Λ_{1.4} \leq 580$ for the dimensionless tidal deformability of the canonical 1.4 $M_{⊙}$ NS from the gravitational wave signal GW170817, (5) the mass-radius relation of PSR J0030+0451 and PSR J0740+6620 measured by NICER, and thus remove the tension between PREX-II and GW170817 observed in the conventional RMF model.
Comments:
9 pages, 2 figures, 2 tables. Results of finite nuclei added. Accepted version to appear in ApJ
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2202.08705 [pdf]
ApJ(2022)·49 citations
04
[Submitted on 17 Feb 2022]
Pure gauge theories and spatial periodicity
Thomas D. Cohen🇺🇸
Properties of pure gauge theories in thermal equilibrium as calculated via standard functional integral treatments are mathematically identical to ground state properties of a theory with spatially-periodic boundary conditions imposed on the gauge fields. Such a theory has states that have no analog in a theory in which only physical observables associated with gauge-invariant operators are required to be periodic, rather than the gauge fields themselves; these states are in topological sectors that do not exist in the unconstrained theory. The topology arises because the boundary conditions in the functional integral are gauge invariant on a cylinder but not in the unconstrained theory.
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2202.08745 [pdf]
1 citation
05
[Submitted on 16 Feb 2022] (cross-list from hep-ph)
DIS physics at the EIC and LHeC and connections to the future LHC and $ν$ A programs
T. J. Hobbs🇺🇸
Deeply-inelastic scattering (DIS) stands to enter a golden age with the prospect of precision programs at the Electron-Ion Collider (EIC) and Large Hadron-electron Collider (LHeC). While these programs will be of considerable importance to resolving longstanding issues in (non)perturbative QCD as well as hadronic and nuclear structure, they will also have valuable implications for a wider range of physics at the Energy and Intensity Frontiers, including at the High-Luminosity LHC (HL-LHC) and future $ν A$ facilities. In this plenary contribution, we highlight a number of salient examples of the potential HEP impact from the complementary EIC and LHeC programs drawn from their respective Yellow Report and Whitepaper. Interested readers are encouraged to consult the extensive studies and literature from which these examples are taken for more detail.
Comments:
10 pages, 5 figures; based on plenary talk presented at DIS 2021
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2202.08286 [pdf]
SciPost Phys.Proc.(2022)·2 citations
06
[Submitted on 17 Feb 2022] (cross-list from hep-ph)
Leading twist GTMDs at nonzero skewness and Wigner distributions in boost-invariant longitudinal position space
Tanmay Maji🇨🇳 · Chandan Mondal🇨🇳 · Daekyoung Kang🇨🇳
We investigate the leading twist quark generalized transverse momentum distributions (GTMDs) at nonzero skewness in a light-front quark-diquark model for the nucleon motivated by soft-wall AdS/QCD. The boost-invariant longitudinal coordinate, $σ = \frac{1}{2} b^{-} P^{+}$ , is identified as the Fourier conjugate of the skewness. The Fourier transform of the GTMDs with respect to the skewness variable $ξ$ can be employed to provide the Wigner distributions in the boost-invariant longitudinal position space $σ$ , the coordinate conjugate to light-front time, $τ = t + z / c$ . The Wigner distributions in the longitudinal position space exhibit diffraction patterns, which are analogous to the diffractive scattering of a wave in optics.
Comments:
19 pages, 10 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2202.08635 [pdf]
PRD(2022)·24 citations
07
[Submitted on 17 Feb 2022] (cross-list from hep-ph)
In-medium hadronization of heavy quarks and its effect on charmed meson and baryon distributions in heavy-ion collisions
Andrea Beraudo🇮🇹 · Arturo De Pace🇮🇹 · Marco Monteno🇮🇹 · Marzia Nardi🇮🇹 · Francesco Prino🇮🇹
We present a new model for the description of heavy-quark hadronization in relativistic heavy-ion collisions in the presence of a reservoir of lighter thermal particles with which recombination can occur leading to the formation of color-singlet clusters. Color neutralization is assumed to occur locally, within the same fluid cell occupied by the heavy quark and it proceeds via the recombination of the latter with light antiquarks (quarks) or diquarks (anti-diquarks), which are assumed to be present in the medium with thermal abundance as effective degrees of freedom around the QCD crossover temperature $T_{c}$ . Typically the resulting color-singlet clusters have quite low invariant mass, in most of the cases below 4 GeV, and in this case they are assumed to undergo an isotropic 2-body decay in their local rest-frame. Heavier clusters are instead fragmented as Lund strings. The possibility of recombination with light diquarks enhances the yields of charmed baryons, in qualitative agreement with recent measurements. The assumption of local color neutralization leads to a strong space-momentum correlation, which provides a substantial enhancement of the collective flow of the final-state charmed hadrons, affecting both their momentum and their angular distributions
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2202.08732 [pdf]
EPJC(2022)·44 citations
08
[Submitted on 17 Feb 2022] (cross-list from physics.atom-ph)
Effect of the neutron quadrupole distribution in the TaO $^{+}$ cation
Gleb Penyazkov · Leonid V. Skripnikov · Alexander V. Oleynichenko · Andréi V. Zaitsevskii
We estimate the effect of the tensor parity nonconserving (PNC) interaction in the $^{181}$ TaO $^{+}$ molecular cation. It can be used to probe the unknown quadrupole distribution of the neutrons inside the Ta nucleus. To this end, we evaluate the constant which characterizes this interaction using the relativistic Fock space coupled cluster theory for electronic structure modelling. The $^{3} Δ_{1}$ state of the TaO $^{+}$ cation which can be used to measure the PNC effect is found to be the ground one in agreement with the previous theoretical study.
Subjects:
Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th); physics.chem-ph (physics.chem-ph)
arXiv:
2202.08741 [pdf]
Chem.Phys.Lett.(2022)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE