π+ and π- elastic and inelastic scattering from 18O have been measured at T(π)=164 MeV. Consistent with the results at 230 MeV, it is found that the ratio σ(π-) σ(π+) for the 21+ state is 1.86(16), while for the 31- state it is 0.89(6). These results are interpreted as indicating differences in neutron and proton deformations characterizing the 21+ transition and partial neutron blocking for the 31- transition. Optical model analysis of elastic scattering leads to the conclusion that 〈rn2〉 1 2-〈rp2〉 1 2=0.03(3) fm.
ASJC Scopus subject areas
- Nuclear and High Energy Physics