Proton scattering by the unstable neutron-rich isotopes Ar-42,Ar-44 - art.no. 014604

Elastic and inelastic proton scattering to the 2(1)(+) states of the neutro n-rich argon isotopes Ar-42 and Ar-44 have been measured in inverse kinemat ics with a beam energy of 33 MeV/nucleon. Phenomenological distorted wave B orn approximation calculations are compared with the data and quadrupole de formation parameters of \beta (2)\=0.32+/-0.05 and \beta (2)\=0.31+/-0.05 a re extracted for the 2(1)(+) states in Ar-42 and Ar-44, respectively. A con sistent microscopic proton scattering analysis has been applied to all even -even argon isotopes from A = 36 to A = 44. This analysis used microscopic collective model densities and a modified Jeukenne-Lejeune-Mahaux nucleon-n ucleon effective interaction. The predicted cross sections agree very well with the experimental data, suggesting this microscopic analysis as a tool to test the structure of nuclei far from stability.