Inelastic proton scattering on the radioactive nuclei {sup 18}Ne and {sup 20}O in inverse kinematics

Elastic and inelastic scattering to the 2{sub 1}{sup +} state of the single closed shell radioactive nuclei {sup 18}Ne and {sup 20}O have been measured in inverse kinematics with a beam energies of 30 MeV/u. The matrix element determined for the 0{sub gs}{sup +}{yields}2{sub 1}{sup +} transitions in these reactions are compared with the corresponding electromagnetic matrix elements to determine M{sub n}/M{sub p}, the ratio of the neutron and proton multipole matrix elements. A comparison between the M{sub n}/M{sub p} values in {sup 20}O and {sup 18}O suggests that the matrix element ratio is increasing as the neutron number increases. The M{sub n}/M{sub p} result for {sup 18}Ne is consistent with one obtained from a comparison of electromagnetic data from the mirror nuclei {sup 18}O and {sup 18}Ne.