Determination of the Structure ofNe31by a Fully Microscopic Framework

Abstract

We perform the first quantitative analysis of the reaction cross sections of 28−32 Ne by 12 C at 240 MeV/nucleon, using the double-folding model (DFM) with the Melbourne g-matrix and the deformed projectile density calculated by the antisymmetrized molecular dynamics (AMD). To describe the tail of the last neutron of 31 Ne, we adopt the resonating group method (RGM) combined with AMD. The theoretical prediction excellently reproduce the measured cross sections of 28−32 Ne with no adjustable parameters. The ground state properties of 31 Ne, i.e., strong deformation and a halo structure with spin-parity 3/2 − , are clarified.

New candidate for deformed halo nucleus in Mg isotopes through analysis of reaction cross sections

“…[3,4], the DFM was applied to the analysis of σ R for the scattering of Ne isotopes on 12 C at 240 MeV/nucleon as shown in Fig. 1 (b).…”

“…In the previous studies [3,4], the measured cross sections of Ne isotopes on a 12 C target at 240 MeV/nucleon have been analyzed by means of the double folding model (DFM) with the densities calculated by antisymmetrized molecular dynamics (AMD). This model is a fully microscopic framework for calculating σ R .…”

“…In particular for 31 Ne, the σ I is much larger than any other Ne isotopes that was measured. This remarkable behavior has stimulated many research activities [3][4][5][6].…”

Measurements of Interaction Cross Sections for 19–27F Isotopes

“…Moreover, prominently large cross section has been observed for 31 Ne and also a similar enhancement of σ R in 37 Mg. Those largely enhanced cross sections for 31 Ne and 37 Mg have been considered as one of the evidences which strongly support the halo formation originated from the strong deformation in 31 Ne and 37 Mg. The halo structure seen in 31 Ne and 37 Mg is specific for the nuclei in the island-of-inversion region and is called "deformed halo structure" [3][4][5][6][7][8].…”

“…Owing to the very systematic and precise measurements of σ I and σ R at RIBF and also extensive theoretical studies, it is indicated that the cross section measurements can be considered not only as the tool to study the halo structures, but also the strong method to probe the gradual development of deformed structures in nuclei as a function of mass number from stable to the drip-line region [3][4][5][7][8][9][10]. In the present study, σ I of fluorine isotopes have been measured systematically from the stable nucleus 19 F to neutron-rich 27 F, the nucleus in the vicinity of the island-of-inversion region.…”