Nuclear Theory·nucl-th

Friday·March 24, 2023

8 papers—5 primary·3 cross-listed

01
[Submitted on 23 Mar 2023]
Effects of magnetic field on the evolution of energy density fluctuations
Shreyansh S. Dave🇮🇳 · Subrata Pal🇮🇳
We study the effects of a static and uniform magnetic field on the evolution of energy density fluctuations present in a medium. By numerically solving the relativistic Boltzmann-Vlasov equation within the relaxation time approximation, we explicitly show that magnetic field can affect the characteristics of energy density fluctuations at the timescale the system achieves local thermodynamic equilibrium. A detailed momentum mode analysis of fluctuations reveals that magnetic field increases the damping of mode oscillations, especially for the low momentum modes. This leads to a reduction in the ultraviolet (high momentum) cutoff of fluctuations and also slows down the dissipation of relatively low momentum fluctuation modes. We discuss the phenomenological implications of our study on various sources of fluctuations in relativistic heavy-ion collisions.
Comments:
12 pages, 10 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2303.13068 [pdf]
PRD(2023)·1 citation
02
[Submitted on 23 Mar 2023]
Examination of promising reactions with $^{241}$ Am and $^{244}$ Cm targets for the synthesis of new superheavy elements within the dinuclear system model with a dynamical potential energy surface
Xiang-Quan Deng · Shan-Gui Zhou
Two actinide isotopes, $^{241}$ Am and $^{244}$ Cm, produced and chemically purified by the HFIR/REDC complex at ORNL are candidates for target materials of heavy-ion fusion reaction experiments for the synthesis of new superheavy elements (SHEs) with $Z > 118$ . In the framework of the dinuclear system model with a dynamical potential energy surface (DNS-DyPES model), we systematically study the $^{48}$ Ca-induced reactions that have been applied to synthesize SHEs with $Z = 112$ --118, as well as the hot-fusion reactions with $^{241}$ Am and $^{244}$ Cm as targets which are promising for synthesizing new SHEs with $Z = 119$ --122. Detailed results including the maximal evaporation residue cross section and the optimal incident energy for each reaction are presented and discussed.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2303.13107 [pdf]
PRC(2023)·20 citations
03
[Submitted on 23 Mar 2023]
Ground state and fission properties of even- $A$ uranium isotopes from multidimensionally-constrained relativistic mean field model
Xiang-Quan Deng · Shan-Gui Zhou
The multidimensionally-constrained covariant density functional theories (MDC-CDFTs) have been developed to study the influence of octupole and triaxial deformations on the ground state and fission properties. In this paper, we present a brief review of the applications of MDC-CDFTs and discuss the results of a systematical study of even- $A$ uranium isotopes with the MDC-RMF model which is one of MDC-CDFTs with pairing correlations treated by using the BCS approach. We examine in detail the two-dimensional potential energy surfaces $E (β_{20}, β_{30})$ of these U isotopes and discuss the ground state and fission properties as well as third and fourth minima on the potential energy surfaces. The emphasis is put on the effects of octupole and triaxial deformations.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2303.13118 [pdf]
IJMPE(2023)·3 citations
04
[Submitted on 23 Mar 2023]
The least-squares analysis of the moments of the charge distribution in the mean-field models
Toshio Suzuki
Comparing the moments of the charge distribution in the mean-field models with experimental values from electron scattering, each value of the related moments of the point proton and neutron distributions is estimated in $^{40}$ Ca, $^{48}$ Ca and $^{208}$ Pb by the least-squares analysis(LSA).
Comments:
37 pages, 25 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2303.13135 [pdf]
PTEP(2024)·3 citations
05
[Submitted on 23 Mar 2023]
Transparency of the $γ (n, p) π^{-}$ reaction in nuclei
Swapan Das🇮🇳
The transparency of the hadrons produced in the $γ (n, p) π^{-}$ reaction in nuclei is calculated using the Glauber model modified by including the Fermi motion of the nucleon in the nucleus. Since the calculated results underestimates the measured transparency for $^{4}$ He nucleus, the Glauber model is further modified by incorporating the short-range correlation of the nucleon and the color transparency of the hadron in the nucleus. The nuclear transparency of the $γ (n, p) π^{-}$ reaction is calculated for $θ_{π^{-}}$ (c.m.) = 50 $^{\circ}$ , 70 $^{\circ}$ and 90 $^{\circ}$ . The calculated results are compared with the data reported for $^{4}$ He nucleus.
Comments:
First version: 11 pages, 2 figures. The reference of the final version is given below
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2303.13214 [pdf]
PRC(2023)·3 citations
06
[Submitted on 17 Mar 2023] (cross-list from hep-lat)
Three relativistic neutrons in a finite volume
Zachary T. Draper🇺🇸 · Maxwell T. Hansen🇬🇧 · Fernando Romero-López🇺🇸 · Stephen R. Sharpe🇺🇸
We generalize the relativistic field-theoretic (RFT) three-particle finite-volume formalism to systems of three identical, massive, spin- $1/2$ fermions, such as three neutrons. This allows, in principle, for the determination of the three-neutron interaction from the finite-volume spectrum of three-neutron states, which can be obtained from lattice QCD calculations.
Comments:
47 pages including references, 1 figure
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2303.10219 [pdf]
JHEP(2023)·44 citations
07
[Submitted on 21 Mar 2023] (cross-list from hep-ph)
Shedding light on shadow generalized parton distributions
Eric Moffat🇺🇸 · Adam Freese🇺🇸 · Ian Cloët🇺🇸 · Thomas Donohoe🇺🇸 · Leonard Gamberg🇺🇸 · Wally Melnitchouk🇺🇸 · Andreas Metz🇺🇸 · Alexei Prokudin🇺🇸 · Nobuo Sato🇺🇸
The feasibility of extracting generalized parton distributions (GPDs) from deeply-virtual Compton scattering (DVCS) data has recently been questioned because of the existence of an infinite set of so-called ''shadow GPDs'' (SGPDs). These SGPDs depend on the process and manifest as multiple solutions (at a fixed scale $Q^{2}$ ) to the inverse problem that needs to be solved to infer GPDs from DVCS data. SGPDs therefore pose a significant challenge for extracting GPDs from DVCS data. With this motivation we study the extent to which QCD evolution can provide constraints on SGPDs. This is possible because the known classes of SGPDs begin to contribute to observables after evolution, and can then be constrained (at the input scale $Q_{0}^{2}$ ) by data that has a finite $Q^{2}$ range. The impact that SGPDs could have on determining the total angular momentum, pressure and sheer force distributions, and tomography is also discussed. Our key finding is that scale evolution, coupled with data over a wide range of skewness $ξ$ and $Q^{2}$ , can constrain the class of SGPDs that we studied and potentially make possible the extraction of GPDs from DVCS data over a limited range in the GPD variables.
Comments:
15 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2303.12006 [pdf]
PRD(2023)·51 citations
08
[Submitted on 23 Mar 2023] (cross-list from physics.atom-ph)
Nuclear polarizability effects in $^{3}$ He $^{+}$ hyperfine splitting
Vojtěch Patkóš · Vladimir A. Yerokhin · Krzysztof Pachucki
The nuclear polarizability effects in hyperfine splitting of light atomic systems are not well known. The only system for which they were previously calculated is the hydrogen atom, where these effects were shown to contribute about 5\% of the total nuclear correction. One generally expects the polarizability effects to become more pronounced for composite nuclei. In the present work we determine the nuclear polarizability correction to the hyperfine splitting in He $^{+}$ by comparing the effective Zemach radius deduced from the experimental hyperfine splitting with the Zemach radius obtained from the electron scattering. We obtain a surprising result that the nuclear polarizability of the helion yields just 3\% of the total nuclear correction, which is smaller than for the proton.
Comments:
5 pages, corrected misprint in Eq. (23)
Subjects:
Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th)
arXiv:
2303.13335 [pdf]
PRA(2023)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE