Nuclear Theory·nucl-th

Wednesday·August 12, 2020

12 papers—4 primary·8 cross-listed

01
$α$ -decay properties of even-even superheavy nuclei
O.N.Ghodsi · M.Hassanzad
In this paper, we have calculated the $α$ -decay half-lives of superheavy nuclei with $106 \leq Z \leq 126$ and a neutron number of $150 \leq N \leq 200$ within proximity potentials and deformed-spherical Coulomb potentials by using $W S 4$ $α$ -decay energy and the semi-classical Wentzel-Kramers-Brillouin approximation for penetration probability. Besides, we have included the preformation factor within the cluster-formation model. We have investigated magic numbers and submagic numbers in the mentioned region; with high probability 162, 178, and 184 are predicted as neutron magic numbers. We also have confirmed that there is good agreement between our predicted half-lives and the ones obtained from semiempirical relationships such as Royer, VSS, UDL, and SemFIS2.
nucl-thPRC(2020)·22 citations
02
The possibility of the secondary object in GW190814 as a neutron star
Kaixuan Huang · Jinniu Hu · Ying Zhang · Hong Shen
A compact object was observed with a mass $2.50 - 2.67 M_{⊙}$ by LIGO Scientific and Virgo collaborations (LVC) in GW190814, which provides a great challenge to the investigations into the supranuclear matter. To study this object, properties of neutron star are systematically calculated within the latest density-dependent relativistic mean-field (DDRMF) parameterizations, which are determined by the ground state properties of spherical nuclei. The maximum masses of neutron star calculated by DD-MEX and DD-LZ1 sets can be around $2.55 M_{⊙}$ with quite stiff equations of state generated by their strong repulsive contributions from vector potentials at high densities. Their maximum speeds of sound $c_{s} / c$ are smaller than $0.8$ at the center of neutron star and the dimensionless tidal deformabilities at $1.4 M_{⊙}$ are less than $800$ . Furthermore, the radii of $1.4 M_{⊙}$ also satisfy the constraint from the observation of mass-radius simultaneous measurements (NICER). Therefore, we conclude that one cannot exclude the possibility of the secondary object in GW190814 as a neutron star composed of hadron matter from DDRMF models.
nucl-thastro-ph.HEApJ(2020)·84 citations
03
Study of ground state properties of carbon isotopes with deformed relativistic Hartree-Bogoliubov theory in continuum
Xiang-Xiang Sun · Jie Zhao · Shan-Gui Zhou
Ground state properties of carbon isotopes, including root-mean-square radii, neutron separation energies, single particle spectra, and shapes are systematically studied with the deformed relativistic Hartree-Bogoliubov theory in continuum. The calculations with the effective interaction PK1 reproduce the available data reasonably well. The shell evolution in this isotopic chain is investigated by examining the single particle spectra. The inversion of neutron orbitals $ν 2 s_{1/2}$ and $ν 1 d_{5/2}$ compared with the order of neutron orbitals in stable nuclei is revealed in $^{15 - 20, 22} C$ when these nuclei are constrained to spherical shape. Neutron halos in $^{15, 19, 22}$ C are studied in detail and their halo structures are mainly caused by the inversion of ( $ν 2 s_{1/2}, ν 1 d_{5/2}$ ) and deformation effects. In particular, $^{15}$ C and $^{22}$ C are deformed halo nuclei with shape decoupling effects in ground states.
nucl-thnucl-exNPA(2020)·68 citations
04
Comparison of the Lindhard-Sorensen and Mott-Bloch corrections to the Bethe stopping formula at moderately relativistic energies
P.B. Kats🇧🇾 · K.V. Halenka🇧🇾 · O.O. Voskresenskaya🇷🇺
The results of numerical calculating the total Mott-Bloch correction to the Bethe stopping formula and the Lindhard-Sorensen correction in the point nucleus approximation, as well as the Mott correction and the difference between the Lindhard-Sorensen and Bloch corrections, which were obtained by some rigorous and approximate methods, are compared for the ranges of a gamma factor of approximately from 1 to 10 and the ion nuclear charge number Z from 6 to 114. It is shown that the accurate calculation of the Mott-Bloch corrections based on the Mott exact cross section using a method previously proposed by one of the authors gives excellent agreement between its values and the values of the Lindhard-Sorensen corrections in the gamma and Z ranges under consideration. In addition, it is demonstrated that the results of stopping power calculations obtained by the two above-mentioned rigorous methods coincide with each other up to the seventh significant digit and provide the best agreement with experimental data in contrast with the results of some approximate methods, such as the methods of Ahlen, Jackson-McCarthy, etc.
nucl-thhep-phPhys.Part.Nucl.Lett.(2021)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE

α-decay properties of even-even superheavy nuclei

The possibility of the secondary object in GW190814 as a neutron star

Study of ground state properties of carbon isotopes with deformed relativistic Hartree-Bogoliubov theory in continuum

Comparison of the Lindhard-Sorensen and Mott-Bloch corrections to the Bethe stopping formula at moderately relativistic energies

Affiliations

$α$ -decay properties of even-even superheavy nuclei