Neutron-proton radius differences and isovector deformations from π+ and π− inelastic scattering from 18O期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Neutron-proton radius differences and isovector deformations from π+ and π− inelastic scattering from 18O

Authors:	S. Iversen H. Nann A. Obst Kamal K. Seth N. Tanaka C.L. Morris H.A. Thiessen K. Boyer W. Cottingame C. Fred Moore R.L. Boudrie D. Dehnhard

Affiliation:	Northwestern University, Evanston, IL 60201, USA;Los Alamos Scientific Laboratory, Los Alamos, NM 87545, USA;University of Texas, Austin, TX 78712, USA;University of Colorado, Boulder, CO 80302, USA;University of Minnesota, Minneapolis, MN 55455, USA

Abstract:	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 $〈r_{n}^{2} 〉^{12} ?〈r_{p}^{2} 〉^{12} =0.03(3) fm$ .

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