Nuclear Theory·nucl-th

Friday·August 23, 2024

6 papers—2 primary·4 cross-listed

01
Exploring isospin-nonconserving effects in the upper $f p$ shell with new mass measurements
H.F. Li · X. Xu · Y. Sun · K. Kaneko · X. Zhou · M. Zhang · W.J. Huang · X.H. Zhou · Yu.A. Litvinov · M. Wang · Y.H. Zhang
Nuclear mass measurements have recently been extended conspicuously to proton-rich region in the upper $f p$ shell. The new data are utilized to study isospin symmetry breaking phenomena}using Coulomb displacement energy (CDE) and triplet displacement energy (TDE) as probes. The new mass data, either measured for the first time or with greatly improved accuracy, removed several previously found ``anomalies" in the systematical behavior in the $f p$ shell. Remarkably, more regular odd-even staggering patterns can be established in both CDE and TDE, calling for a uniform explanation in terms of isospin-nonconserving (INC) forces across the $s d$ , $f_{7/2}$ , and upper $f p$ shells. By extending the large-scale shell-model calculation [Phys. Rev. Lett. \textbf{110}, 172505 (2013)] to the upper $f p$ -shell region, we found that, in order to describe the new data, the same INC force is required as previously used for the $f_{7/2}$ shell. Especially, we propose the $T = 1$ TDE for those triplet nuclei, that have $pp$ , $nn$ , and $p n$ pairs on top of a common even-even $N = Z$ core, to be a good indicator for the isotensor component of isospin violating interactions, which is estimated here to be 150 keV.
nucl-thPRC(2024)·4 citations
02
Non-extensive (3+1)-dimensional hydrodynamics for relativistic heavy-ion collisions
Jia-Hao Shi🇨🇳 · Zhi-Ying Qin🇨🇳 · Jin-Peng Zhang🇨🇳 · Jian Cao🇨🇳 · Ze-Fang Jiang🇨🇳 · Wen-Chao Zhang🇨🇳 · Hua Zheng🇨🇳
A non-extensive (3+1)-dimensional hydrodynamic model for multi-particle production processes, NEX-CLVisc, is developed in the framework of CLVisc where the viscous corrections are turned off. It assumes that the non-extensive effects consistently exist in the initial conditions set by the optical Glauber model, the equation of state and the hadron kinetic freeze-out procedure. The model is then applied to simulate the pseudo-rapidity ( $η$ ) distribution, the transverse momentum ( $p_{T}$ ) spectra and the $p_{T}$ -differential elliptic flow ( $v_{2}$ ) of charged particles in Pb-Pb collisions at $s_{NN} =$ 2.76 TeV and 5.02 TeV, respectively. It is found that the model can reasonably well reproduce the experimental data of the $η$ distribution and the charged-particle spectra in a $p_{T}$ range up to 6-8 GeV/c. When compared with the ideal hydrodynamic model, the $p_{T}$ -differential $v_{2}$ of charged particles is suppressed in the NEX-CLVisc model, which is similar to that observed in the hydrodynamic model with a shear viscous correction. Moreover, due to the lack of the viscous corrections and the event-by-event fluctuation, the model can only describe the $p_{T}$ -differential $v_{2}$ up to 3-4 GeV/c, which is smaller than its applicable range for the particle $p_{T}$ spectra.
nucl-thPRD(2025)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE

Exploring isospin-nonconserving effects in the upper fp shell with new mass measurements

Non-extensive (3+1)-dimensional hydrodynamics for relativistic heavy-ion collisions

Affiliations

Exploring isospin-nonconserving effects in the upper $f p$ shell with new mass measurements