Nuclear Theory·nucl-th

Tuesday·July 25, 2023

18 papers—6 primary·12 cross-listed

01
[Submitted on 21 Jul 2023]
Hard probes in isobar collisions as a probe of the neutron skin
Wilke van der Schee🇨🇭 · Yen-Jie Lee🇺🇸 · Govert Nijs🇺🇸 · Yi Chen🇺🇸
We present an estimate of the yield of hard probes expected for collisions of the isobars $_{44}^{96}$ Ru and $_{40}^{96}$ Zr at collision energies reachable at RHIC and the LHC\@. These yields are proportional to the number of binary nucleon-nucleon interactions, which is characteristically different due to the presence of the large neutron skin in $_{40}^{96}$ Zr. This provides an independent opportunity to measure the difference between the neutron skin of $_{44}^{96}$ Ru and $_{40}^{96}$ Zr, which can provide an important constraint on the Equation of State of cold neutron-rich matter.
Comments:
5 pages, 6 figures and an appendix. Comments are welcome
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2307.11836 [pdf]
PLB(2024)·12 citations
02
[Submitted on 21 Jul 2023]
$T = 1$ Pairing Along the $N = Z$ Line
B. Alex Brown · Michio Honma · Ragnar Stroberg
Pairing energies for the addition of two neutrons on even-even nuclei with $N = Z$ are studied. The $Z$ dependence is attributed to the number and type of orbitals that are occupied in the valence shell-model space. Properties in the region from $Z = 60 - 100$ depend on the location of the $0 g_{9/2}$ orbital.
Comments:
3 pages and 2 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2307.11861 [pdf]
0 citations
03
[Submitted on 23 Jul 2023]
Generalised description of Neutron Star matter with nucleonic Relativistic Density Functional
Prasanta Char🇧🇪 · Chiranjib Mondal🇫🇷 · Francesca Gulminelli🇫🇷 · Micaela Oertel🇫🇷
In this work, we propose a meta-modelling technique to nuclear matter on the basis of a relativistic density functional with density-dependent couplings. Identical density dependence for the couplings both in the isoscalar and isovector sectors is employed. We vary the coupling parameters of the model to capture the uncertainties of the empirical nuclear matter parameters at saturation. Then, we construct a large ensemble of unified equations of state in a consistent manner both for clusterized and uniform matter in $β$ -equilibrium at zero temperature. Finally, we calculate neutron star properties to check the consistency with astrophysical observations within a Bayesian framework. Out of the different sets of astrophysical data employed, constraint on tidal deformability from the GW170817 event was found to be the most stringent in the posteriors of different neutron star properties explored in the present study. We demonstrate in detail the impact of the isovector incompressibility ( $K_{sy m}$ ) on high-density matter that leads to a considerable variation in the composition of neutron star matter. A couple of selected models with extreme values of $K_{sy m}$ , which satisfy various modern nuclear physics and neutron star astrophysics constraints, are uploaded in the \textsc{CompOSE} \cite{Typel:2013rza} database for use by the community.
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2307.12364 [pdf]
PRD(2023)·41 citations
04
[Submitted on 24 Jul 2023]
Singlet Deuteron, Dineutron and Neutral Nuclei
S.B. Borzakov
The existence of the dineutron was predicted over 70 years ago. At present, a number of experimental works confirm this assumption. By virtue of the principle of isotopic invariance, a singlet deuteron must also exist. The possibility of describing the neutron-proton interaction in the state at low energies as the excitation of a quasi-stationary level (singlet deuteron) lying below the deuteron decay threshold is discussed. The position, neutron and radiative widths of the level are determined by the scattering length, the effective radius, and the cross section for the radiative capture of neutrons by protons. Experiments to search for this level are discussed. The discovery of the singlet deuteron would be confirmation of the existence of the dineutron.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2307.12719 [pdf]
0 citations
05
[Submitted on 24 Jul 2023]
Recent astrophysical observations reproduced by a short-range correlated van der Waals-type model?
E. H. Rodrigues🇧🇷 · M. Dutra🇧🇷 · O. Lourenço🇧🇷
We perform an improvement in a van der Waals-type model by including it effects of short-range correlations (SRC). Attractive and repulsive parts of the nucleon-nucleon interaction are assumed to be density-dependent functions, more specifically, we adopt the Carnahan-Starling (CS) method for the latter, and a suitable expression for the former in order to reproduce the structure of the Clausius (C) real gas model. The parametrizations of the resulting model, named as CCS-SRC model, are shown to be capable of reproducing the flow constraint at the high-density regime of symmetric nuclear matter for incompressibility values inside the range of $K_{0} = (240 \pm 20)$ MeV. In the context of stellar matter, our findings point out a good agreement of the CCS-SRC model with recent astrophysical observational data, namely, mass-radius contours and dimensionless tidal deformability regions and values, coming from gravitational waves data related to the GW170817 and GW190425 events, and from the NASA's Neutron star Interior Composition Explorer (NICER) mission. Furthermore, the values for the symmetry energy slope of the model ( $L_{0}$ ) are in agreement with a recent range found for this quantity, claimed to be consistent with results reported by the updated lead radius experiment (PREX-2) collaboration. In this case, higher values of $L_{0}$ are favored, while the opposite scenario does not allow simultaneous compatibility between the model and the astrophysical data.
Comments:
9 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2307.12817 [pdf]
MNRAS(2023)·3 citations
06
[Submitted on 24 Jul 2023]
Possibility of generating the $_{Λ_{c}}^{3}$ H in the quark-delocalization color-screening model
Siyu Wu🇨🇳 · Qian Wu🇨🇳 · Hongxia Huang🇨🇳 · Xurong Chen🇨🇳 · Jialun Ping🇨🇳 · Qian Wang🇨🇳
We probe the existence of the $_{Λ_{c}}^{3}$ H where the $N Λ_{c}$ potentials are derived from the quark-delocalization color-screening model (QDCSM). The $N Λ_{c}$ system is studied and the $N Λ_{c}$ scattering length so as the effective range are obtained in the QDCSM. We construct effective Gaussian-type $N Λ_{c}$ potentials which reproduce the $N Λ_{c}$ scattering data given by the QDCSM. By solving the $N N Λ_{c}$ three body Schrödinger equation with the Gaussian expansion method, we calculate the energies of the $_{Λ_{c}}^{3}$ H with isospin $I = 0$ , $J^{P} = 1/ 2^{+}$ and $I = 0$ , $J^{P} = 3/ 2^{+}$ under different color screening parameter $μ$ . The $J^{P} = 1/ 2^{+}$ and $J^{P} = 3/ 2^{+}$ states are both bound when the color screening parameter $μ$ is set to 1.0 or 1.2, where the $J^{P} = 1/ 2^{+}$ state is bound by $0.08 \sim 0.85$ MeV and the $J^{P} = 3/ 2^{+}$ state is bound by $0.15 \sim 1.31$ MeV with respect to the deuteron- $Λ_{c}$ threshold.
Comments:
7 pages, 6 gigures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2307.12842 [pdf]
PRC(2024)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE

Hard probes in isobar collisions as a probe of the neutron skin

T=1 Pairing Along the N=Z Line

Generalised description of Neutron Star matter with nucleonic Relativistic Density Functional

Singlet Deuteron, Dineutron and Neutral Nuclei

Recent astrophysical observations reproduced by a short-range correlated van der Waals-type model?

Possibility of generating the Λc​3​H in the quark-delocalization color-screening model

Affiliations

$T = 1$ Pairing Along the $N = Z$ Line

Possibility of generating the $_{Λ_{c}}^{3}$ H in the quark-delocalization color-screening model