Nuclear Theory·nucl-th

Wednesday·September 21, 2022

9 papers—3 primary·6 cross-listed

01
Collective-model description of shape coexistence and intruder states in cadmium isotopes based on a relativistic energy density functional
K. Nomura · K.E. Karakatsanis
Low-energy structure of even-even $^{108 - 116}$ Cd isotopes is analyzed using a collective model that is based on the nuclear density functional theory. Spectroscopic properties are computed by solving the triaxial quadrupole collective Hamiltonian, with parameters determined by the constrained self-consistent mean-field calculations within the relativistic Hartree-Bogoliubov method employing a universal energy density functional and a pairing force. The collective Hamiltonian reproduces the observed quadrupole phonon states of vibrational character, which are based on the moderately deformed equilibrium minimum in the mean-field potential energy surface. In addition, the calculation yields a low-lying excited $0^{+}$ band and a $γ$ -vibrational band that are associated with a deformed local minimum close in energy to the ground state, consistently with the empirical interpretation of these bands as intruder bands. Observed energy spectra, $B (E 2)$ , and $ρ^{2} (E 0)$ values are, in general, reproduced reasonably well.
nucl-thnucl-exPRC(2022)·9 citations
02
Hyperonic equation of state at finite temperature for neutron stars
Hristijan Kochankovski · Angels Ramos · Laura Tolos
We review the composition and the equation of state of the hyperonic core of neutron stars at finite temperature within a relativistic mean-field approach. We make use of the new FSU2H* model, which is built upon the FSU2H scheme by improving on the Xi potential according to the recent analysis on the Xi atoms, and we extend it to include finite temperature corrections. The calculations are done for a wide range of densities, temperatures and charge fractions, thus exploring the different conditions that can be found in protoneutron stars, binary mergers remnants and supernovae explosions. The inclusion of hyperons has a strong effect on the composition and the equation of state at finite temperature, which consequently would lead to significant changes in the properties and evolution of hot neutron stars.
nucl-thastro-ph.HEEPJ Web Conf.(2022)·1 citation
03
Muon capture on deuteron using local chiral potentials
L. Ceccarelli🇮🇹 · A. Gnech🇺🇸 · L.E. Marcucci🇮🇹 · M. Piarulli🇺🇸 · M. Viviani🇮🇹
The muon capture reaction $μ^{-} + d \to n + n + ν_{μ}$ in the doublet hyperfine state is studied using nuclear potentials and consistent currents derived in chiral effective field theory, which are local and expressed in coordinate-space (the so-called Norfolk models). Only the largest contribution due to the $^{1} S_{0}$ $nn$ scattering state is considered. Particular attention is given to the estimate of the theoretical uncertainty, for which four sources have been identified: (i) the model dependence, (ii) the chiral order convergence for the weak nuclear current, (iii) the uncertainty in the single-nucleon axial form factor, and (iv) the numerical technique adopted to solve the bound and scattering $A = 2$ systems. This last source of uncertainty has turned out essentially negligible. The $^{1} S_{0}$ doublet muon capture rate $Γ^{D} (^{1} S_{0})$ has been found to be $Γ^{D} (^{1} S_{0}) = 255.8 (0.6) (4.4) (2.9)$ s $^{- 1}$ , where the three errors come from the first three sources of uncertainty. The value for $Γ^{D} (^{1} S_{0})$ obtained within this local chiral framework is compared with previous calculations and found in very good agreement.
nucl-thFront.Phys.(2023)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE

Collective-model description of shape coexistence and intruder states in cadmium isotopes based on a relativistic energy density functional

Hyperonic equation of state at finite temperature for neutron stars

Muon capture on deuteron using local chiral potentials

Affiliations