Electric dipole transitions from the 11.08 and 9.15 MeV levels in 17O

Abstract

In the 13C(α, γ)17O reaction, measurements of E1 transition strengths from the 11.078 and 9.148 MeV (Jπ = 1/2−) levels to the 0.871 MeV level give (10.4 ± 1.6) × 10−3and (2.4 ± 0.5) × 10−3 e2 fm2, respectively. The ratio of these transition strengths results in a polarization charge epol ≈ −0.6. The E1 transition strength from the 11.078 MeV level is in excellent agreement with the core-polarization calculation of Towner and Hardy. The asymmetry for the corresponding isovector E1 transitions in 17O and 17F is found to be [Formula: see text], comparable in magnitude with the asymmetry for the analogous [Formula: see text] decays of 17N and 17Ne.