Density distribution ofNe17and possible shell-structure change in the proton-richsd-shell nuclei

Abstract

Reaction cross sections (${\ensuremath{\sigma}}_{R}$) for the proton drip-line nucleus $^{17}\mathrm{Ne}$ have been measured on $^{9}\mathrm{Be}$, $^{12}\mathrm{C}$, and $^{27}\mathrm{Al}$ targets at 64 and 42 MeV/nucleon by the transmission method. From the energy dependence of the ${\ensuremath{\sigma}}_{R}$ including the high energy data, the density distribution of $^{17}\mathrm{Ne}$ was deduced through a modified Glauber-type calculation. It is indicated that $^{17}\mathrm{Ne}$ has a long tail in the density, consistent with a $(2{s}_{1/2}){}^{2}$-dominant configuration of two valence protons.