Nuclear Theory·nucl-th

Thursday·February 10, 2022

9 papers—6 primary·3 cross-listed

01
[Submitted on 9 Feb 2022]
Matter radii and skins of $^{6, 8}$ He from reaction cross section of proton+ $^{6, 8}$ He scattering based on the Love-Franey $t$ -matrix model (published in Results in Physics)
Tomotsugu Wakasa · Maya Takechi · Shingo Tagami · Masanobu Yahiro
For $^{4, 6, 8}$ He, Tanihata et al. determined matter radii $r_{m} (σ_{I}) = 1.57 (4), 2.48 (3), 2.52 (3)$ ~fm from interaction cross sections $σ_{I}$ for $^{4, 6, 8}$ He scattering on Be, C Al targets at 790~MeV/nucleon. Lu et al. measured the atomic isotope shifts (AIS) for $^{4, 6, 8}$ He and determined proton radii $r_{p} (AIS)$ for $^{4, 6, 8}$ He. As for p+ $^{4, 6, 8}$ He scattering, reaction cross sections $σ_{R} (exp)$ are available at 700~MeV with high accuracy. Our aim is to determine matter radii $r_{m}$ and skins $r_{skin}$ for $^{6, 8}$ He from the $σ_{R} (exp)$ and the $r_{p} (AIS)$ . {\bf Method:} Our model is the Love-Franey $t$ -matrix folding model, since the model is better than the optical limit of Glauber model. Our results for $^{6, 8}$ He are $r_{m} (exp) = 2.48 (3), 2.53 (2)$ ~fm and $r_{skin} =$ 0.78(3), 0.82(2)~fm. For $^{6, 8}$ He, our results $r_{m} (σ_{R})$ agree with those of Tanihata {\it et al.}. For $^{8}$ He, the distance between $^{4}$ He and the center of mass of valence four neutrons is 2.367~fm.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2202.04229 [pdf]
0 citations
02
[Submitted on 9 Feb 2022]
$Ξ$ hypernuclei $_{Ξ}^{15}$ C, $_{Ξ}^{12}$ Be and $Ξ N$ two-body interaction
Yusuke Tanimura🇯🇵 · Hiroyuki Sagawa🇯🇵 · Tingting Sun🇨🇳 · Emiko Hiyama🇯🇵
We study the energy spectra of $Ξ$ hypernuclei $_{Ξ}^{15}$ C and $_{Ξ}^{12}$ Be with a relativistic mean field (RMF) model with meson exchange $Ξ N$ interactions. The RMF parameters are optimized to reproduce the average energy of KINKA and IRRAWADDY events for the ground state and also the average energy of KISO and IBUKI events for the excited state in $_{Ξ}^{15}$ C. The potential depth of average $Ξ N$ mean field potential is found to be about $- 12$ MeV in the nuclear matter limit. We further introduce the two-body $s$ - and $p$ -wave interactions between valence nucleons and $Ξ$ particle. We found that the $s$ -wave interaction deduced from the HAL LQCD results is rather weak to obtain the energy difference between IRRAWADDY and KINKA events. The $p$ -wave interaction is added and fitted to reproduce the energy difference. The resulting interaction together with the $s$ -wave one gives a reasonable energy simultanously for the IBUKI event as an excited $Ξ_{p}$ state. The model is further applied to predict the energy spectrum of $_{Ξ}^{12}$ Be.
Comments:
7 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2202.04276 [pdf]
PRC(2022)·12 citations
03
[Submitted on 9 Feb 2022]
Nuclear Spectroscopy with Heavy Ion Nucleon Knockout and (p,2p) Reactions
Jianguo Li · Carlos A. Bertulani · Furong Xu
Knockout reactions with heavy ion targets in inverse kinematics, as well as "quasi-free" (p,2p) and (p,pn) reactions are useful tools for nuclear spectroscopy. We report calculations on \textit{ab-initio} many-body wavefunctions based on the no-core shell model to study the nucleon removal reactions in light nuclei, including beryllium, carbon, and oxygen isotopic chains, and explore the importance of using an \textit{ab-initio} method. Our study helps clarifying how the extraction of spectroscopic factors from the experiments depend on the details of the many-body wavefunctions being probed. We show that recent advances with the ab-initio method can provide more insights on the spectroscopy information extracted from experiments.
Comments:
11 pages, 1 figure
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2202.04354 [pdf]
PRC(2022)·18 citations
04
[Submitted on 9 Feb 2022]
Probing the Impact of WIMP Dark Matter on Universal Relations, GW170817 Posterior and Radial Oscillations
Pinku Routaray🇮🇳 · Abdul Quddus🇮🇳 · Kabir Chakravarti🇮🇳 · Bharat Kumar🇮🇳
In this study, we investigate the impact of Weakly Interacting Massive Particles (WIMPs) dark matter (DM) on $C - Λ$ universal relations, GW170817 posterior and radial oscillations of neutron stars (NSs) by considering the interactions of uniformly trapped neutralinos as a DM candidate with the hadronic matter through the exchange of the Higgs boson within the framework of the Next-to-Minimal Supersymmetric Standard Model (NMSSM). The hadronic equation of state (EOS) is modeled using the relativistic mean-field (RMF) formalism with IOPB-I, G3, and QMC-RMF series parameter sets. Presence of DM softens the EOS at both the background and the perturbation levels that implies a small shift to the left in the posterior accompanied by a much larger jump in the left of the mass-radius curves with increasing DM mass. It is observed that EOSs with DM also satisfy the $C - Λ$ universality relations among their-selves but get slightly shifted to the right in comparison to that without considering DM. Additionally, we find that the inclusion of DM allows the mass-radius ( $M - R$ ) curves to remain consistent with observational constraints for HESS J1731-347, indicating the possibility of classifying it as a dark matter-admixed neutron star (DMANS). Moreover, we explore the impact of DM on the radial oscillations of pulsating stars and investigate the stability of NSs. The results demonstrate a positive correlation between the mass of DM and the frequencies of radial oscillation modes.
Comments:
8 pages
Subjects:
Nuclear Theory (nucl-th); General Relativity and Quantum Cosmology (gr-qc)
arXiv:
2202.04364 [pdf]
MNRAS(2023)·24 citations
05
[Submitted on 7 Feb 2022]
Self-consistent energy density functional approaches to the crust of neutron stars
Takashi Nakatsukasa (Univ. Tsukuba)
In order to study structure of the crust in neutron stars, we develop a finite-temperature Skyrme-Hartree-Fock method in the full three-dimensional coordinate space using the Fermion operator expansion method. It provides us with a possible order-N approach to non-uniform neutron-star matters.
Comments:
3 pages, 1 figure, NIC-XVI Conference proceedings
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2202.04448 [pdf]
EPJ Web Conf.(2022)·0 citations
06
[Submitted on 9 Feb 2022]
Symmetries in subatomic six-quark fermions
J.D. Vergados🇬🇷 · D. Strottman🇺🇸
The evidence of the existence of tetra-quark meson and penta-quark fermion systems has revived interest in the hunt of other multi-quark systems. We explore the possibility of six-quark cluster configurations with the two nucleon spin-isospin quantum numbers existing in the nuclear medium. The investigation of such clusters is feasible if one exploits all the symmetries involved, in particular orbital, color-spin $S U (6)_{cs}$ and isospin SU(2). We investigate whether such clusters contribute to neutrinoless double-beta decay mediated by heavy neutrinos or other exotic particles, since in conventional nuclear physics the relevant nuclear matrix elements are suppressed due to the presence of the nuclear hard core.
Comments:
48 pages, 2 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2202.04563 [pdf]
0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Matter radii and skins of 6,8He from reaction cross section of proton+6,8He scattering based on the Love-Franey t-matrix model (published in Results in Physics)

Ξ hypernuclei Ξ15​C, Ξ12​Be and ΞN two-body interaction

Nuclear Spectroscopy with Heavy Ion Nucleon Knockout and (p,2p) Reactions

Probing the Impact of WIMP Dark Matter on Universal Relations, GW170817 Posterior and Radial Oscillations

Self-consistent energy density functional approaches to the crust of neutron stars

Symmetries in subatomic six-quark fermions

Affiliations

Matter radii and skins of $^{6, 8}$ He from reaction cross section of proton+ $^{6, 8}$ He scattering based on the Love-Franey $t$ -matrix model (published in Results in Physics)

$Ξ$ hypernuclei $_{Ξ}^{15}$ C, $_{Ξ}^{12}$ Be and $Ξ N$ two-body interaction