Nuclear Theory·nucl-th

Monday·April 13, 2020

6 papers—3 primary·3 cross-listed

01
[Submitted on 10 Apr 2020]
Constraints on the neutron drip-line with the newly observed 39Na
Q.Z. Chai · J.C. Pei · Na Fei · D.W. Guan
The recently observed weakly-bound 39Na provides a stringent theoretical constraint on the neutron drip-line. We studied the properties of drip-line nuclei around 39Na with the Hartree-Fock-Bogoliubov method and various Skyrme interactions. We adopted the extended SkM*-ext1 parameterization which can properly describe two-neutron separation energies of oxygen and fluorine isotopes and deformations at the center of the "island of inversion". Systematic calculations of drip lines of O, F, Ne, Na, Mg, and Al isotopes have been performed. We infer that 42Mg is weakly bound and 45Al is less weakly bound. 44Mg and 47Al could be barely existed. We also demonstrated the deformed halo properties of 39Na. Our studies could be valuable for experimental explorations of drip-line nuclei in the forthcoming FRIB and other rare-isotope beam facilities .
Comments:
6 pages, 4 figures, submitted
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2004.04897 [pdf]
PRC(2020)·17 citations
02
[Submitted on 10 Apr 2020]
Neutron dominance in excited states of $^{26}$ Mg and $^{10}$ Be probed by proton and alpha inelastic scattering
Yoshiko Kanada-En'yo · Yuki Shikata · Yohei Chiba · Kazuyuki Ogata
Isospin characters of nuclear excitations in $^{26}$ Mg and $^{10}$ Be are investigated via proton( $p$ ) and alpha( $α$ ) inelastic scattering. A structure model of antisymmetrized molecular dynamics (AMD) is applied to calculate the ground and excited states of $^{26}$ Mg and $^{10}$ Be. The calculation describes the isoscalar feature of the ground-band $2_{1}^{+}$ ( $K^{π} = 0_{1}^{+}$ ) excitation and predicts the neutron dominance of the side-band $2_{2}^{+}$ ( $K^{π} = 2^{+}$ ) excitation in $^{26}$ Mg and $^{10}$ Be. The $p$ and $α$ inelastic scattering off $^{26}$ Mg and $^{10}$ Be is calculated by microscopic coupled-channel (MCC) calculations with a $g$ -matrix folding approach by using the matter and transition densities of the target nuclei calculated with AMD. The calculation reasonably reproduces the observed $0_{1}^{+}$ , $2_{1}^{+}$ , and $2_{2}^{+}$ cross sections of $^{26}$ Mg+ $p$ scattering at incident energies $E_{p} =$ 24 and 40 MeV and of $^{26}$ Mg+ $α$ scattering at $E_{α} =$ 104 and 120 MeV. For $^{10}$ Be+ $p$ and $^{10}$ Be+ $α$ scattering, inelastic cross sections to the excited states in the $K^{π} = 0_{1}^{+}$ ground-, $K^{π} = 2^{+}$ side-, $K^{π} = 0_{2}^{+}$ cluster-, and $K^{π} = 1^{-}$ cluster-bands are investigated. The isospin characters of excitations are investigated via inelastic scattering processes by comparison of the production rates in the $^{10}$ Be+ $p$ , $^{10}$ Be+ $α$ , and $^{10}$ C+ $p$ reactions. The result predicts that the $2_{2}^{+}$ state is selectively produced by the $^{10}$ Be+ $p$ reaction because of the neutron dominance in the $2_{2}^{+}$ excitation as in the case of the $^{26}$ Mg+ $p$ scattering to the $2_{2}^{+}$ state, whereas its production is significantly suppressed in the $^{10}$ C+ $p$ reaction.
Comments:
19 pages, 12 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2004.04936 [pdf]
PRC(2020)·13 citations
03
[Submitted on 10 Apr 2020]
Structure functions generated by zero sound excitations
V. A. Sadovnikova (St. Petersburg, INP)
In isospin symmetric and asymmetric nuclear matter we study the structure functions connected with the zero sound excitations. In the simple model with Landau-Migdal quasiparticle interactions the density response $Π^{R} (ω, k)$ of the nuclear matter to the small isovector external field $V_{0} (ω, k)$ is considered. In the previous papers the complex branches of solutions $ω_{s i} (k)$ , $i = n, p, n p$ of the dispersion equation corresponding to zero sound excitations in the symmetric and asymmetric nuclear matter are obtained. Now we investigate the structure and response functions of nuclear matter based on these solutions.
Comments:
14 pages, 3 figures, corrected misprint
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2004.04971 [pdf]
1 citation

Affiliations

first authorsco-authorsvia INSPIRE

Constraints on the neutron drip-line with the newly observed 39Na

Neutron dominance in excited states of 26Mg and 10Be probed by proton and alpha inelastic scattering

Structure functions generated by zero sound excitations

Affiliations

Neutron dominance in excited states of $^{26}$ Mg and $^{10}$ Be probed by proton and alpha inelastic scattering