Absolute E1 and E2 transition rates in ¹¹⁰Cd

Abstract:

The lifetimes of several states in ¹¹⁰Cd have been determined by means of the generalized centroid-shift method. The reaction ¹⁰⁸Pd(α,2n) has been used and the following results were obtained: T_1/2(2879 keV) = 0.60 ± 0.10 ns, T_1/2(3029 keV) = 0.30 ± 0.10 ns, T_1/2(3056 keV) = 2.25 ± 0.10 ns, T_1/2(3611 keV) = 0.45 ± 0.10 ns. Electric dipole and quadrupole transitions are discussed in terms of octupole and quadrupole collectivity. The odd-spin sequence of the semi-aligned structure ν(h_11/2d_5/2) has been established with the band-head at J^π= 7⁻ ₂ identified as a new two-quasiparticle isomer, the lower-lying 5⁻ _1,2 states being of two-quasiproton character. Nuclear Reaction: ¹⁰⁸Pd(α,2n), E = 27 MeV; measured E_γ, I_γ, γ-r.f. Deduced: T_1/2, B(αL) in ¹¹⁰Cd. Ge detectors. Generalized centroid-shift analysis.