Phys.Rev. C 102, 014324 (2020)

M.Beckers, C.Muller-Gatermann, A.Blazhev, T.Braunroth, A.Dewald, C.Fransen, A.Goldkuhle, L.Kornwebel, J.Litzinger, F.von Spee, K.-O.Zell

Lifetime measurement of excited states in ¹⁴⁴Ce: Enhanced E1 strengths in a candidate for octupole deformation

NUCLEAR REACTIONS ¹⁴²Ce(¹⁸O, ¹⁶O), E=67 MeV; measured Eγ, Iγ, (¹⁶O)γ-coin, half-lives of the first 2+, 3-, 4+ and 6+, and second 4+ states by recoil-distance Doppler-shift method at the Cologne FN Tandem accelerator. ¹⁴⁴Ce; deduced levels, J, π, B(E1), B(E2), enhanced E1 strengths, intrinsic dipole transition moment D₀, octupole deformation. Comparison with shell model predictions, and with B(E2) in ¹⁴²Ba. Systematics of B(E2) values for the first 2+ states for N=82-92, Ce, Ba, and Nd isotopes.

doi: 10.1103/PhysRevC.102.014324