Interaction cross sections and radii of light nuclei

Abstract

The interaction cross sections (σ_I's) with ¹⁵B, ⁹C, ¹⁰C, ¹⁵C, ¹³N, ¹³O, ¹⁴O and ¹⁵O beams have been measured at energies of around 730A·MeV. The effective root-mean-square (RMS) radii of the nucleon distribution of these nuclei have been deduced using a Glauber-model calculation. The global isotope and isospin dependences of the radii are shown in the p-shell region. The σ_I's are also compared with those obtained at intermediate energies in the region. Furthermore, we calculated the Coulomb-energy differences of the mirror pairs deduced from the RMS charge radii and compared them with those obtained from the mass for some mirror pairs. From the above systematics, an anomalous nuclear structure (a halo and/or a skin) is suggested for ¹⁴B and ¹⁵C, and the occurrence of an s-d inversion is emphasized for the ¹⁷Ne¹⁷N mirror pair.