Nuclear Theory·nucl-th

Tuesday·January 9, 2024

10 papers—3 primary·7 cross-listed

01
Systematic shell-model study of $^{99 - 129}$ Cd isotopes and isomers in neutron-rich $^{127 - 131}$ In isotopes
Deepak Patel · Praveen C. Srivastava · Noritaka Shimizu · Yutaka Utsuno
Systematic shell-model calculations are presented for odd-mass Cd isotopes with $N = 51 - 81$ utilizing a combination of a $G$ -matrix interaction and a semiempirical one. The excited energy spectra and electromagnetic transition probabilities are compared with the recently available experimental data. We have found that the observed quadrupole moments in the $11/ 2_{1}^{-}$ states that linearly change with the neutron number are well accounted for by the dominance of prolate shapes throughout the Cd isotope chain. We have also described the properties of several isomeric states in neutron-rich $^{127 - 131}$ In isotopes that were recently observed in Jyväskylä.
nucl-thnucl-exPRC(2024)·5 citations
02
High-order Shakhov-like extension of the relaxation time approximation in relativistic kinetic theory
Victor E. Ambruş · David Wagner
In this paper we present a relativistic Shakhov-type generalization of the Anderson-Witting relaxation time model for the Boltzmann collision integral. The extension is performed by modifying the path on which the distribution function $f_{k}$ is taken towards local equilibrium $f_{0 k}$ , by replacing $f_{k} - f_{0 k}$ via $f_{k} - f_{S k}$ . The Shakhov-like distribution $f_{S k}$ is constructed using $f_{0 k}$ and the irreducible moments $ρ_{r}^{μ_{1} \dots μ_{ℓ}}$ of $f_{k}$ and reduces to $f_{0 k}$ in local equilibrium. Employing the method of moments, we derive systematic high-order Shakhov extensions that allow both the first- and the second-order transport coefficients to be controlled independently of each other. We illustrate the capabilities of the formalism by tweaking the shear-bulk coupling coefficient $λ_{Π π}$ in the frame of the Bjorken flow of massive particles, as well as the diffusion-shear transport coefficients $ℓ_{V π}$ , $ℓ_{π V}$ in the frame of sound wave propagation in an ultrarelativistic gas. Finally, we illustrate the importance of second-order transport coefficients by comparison with the results of the stochastic BAMPS method in the context of the one-dimensional Riemann problem.
nucl-thphysics.flu-dynPRD(2024)·6 citations
03
Characterizing the initial and final state effects in isobaric collisions at energies available at the BNL Relativistic Heavy Ion Collider
Niseem Magdy🇺🇸
The Multi-Phase Transport model (AMPT) is employed to predict Symmetric Correlations (SC), Asymmetric Correlations (ASC), Normalized Symmetric Correlations (NSC), and Normalized Asymmetric Correlations (NASC) in $^{96} R u +^{96} R u$ and $^{96} Z r +^{96} Z r$ collisions at 200~GeV. Our study offers insights into the behavior of SC, ASC, NSC, and NASC, considering various nuclear structure scenarios to account for differences between the two isobars. Additionally, we emphasize the importance of detailed experimental measurements as they will serve as a critical constraint for refining the predictions of theoretical models.
nucl-thnucl-exPRC(2024)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE

Systematic shell-model study of 99−129Cd isotopes and isomers in neutron-rich 127−131In isotopes

High-order Shakhov-like extension of the relaxation time approximation in relativistic kinetic theory

Characterizing the initial and final state effects in isobaric collisions at energies available at the BNL Relativistic Heavy Ion Collider

Affiliations

Systematic shell-model study of $^{99 - 129}$ Cd isotopes and isomers in neutron-rich $^{127 - 131}$ In isotopes