Phys.Rev. C 95, 014308 (2017)

B.J.Zhu, C.B.Li, X.G.Wu, J.Zhong, Q.M.Chen, Y.Zheng, C.Y.He, W.K.Zhou, L.T.Deng, G.S.Li

Investigation of the anomalously low B (E2;4⁺₁ → 2⁺₁) /B (E2;2⁺₁ → 0⁺₁) ratio in ¹³⁴Ce through lifetime measurements

NUCLEAR REACTIONS ¹²²Sn(¹⁶O, 4n), E=76 MeV; measured Eγ, γγ-coin, level half-lives by recoil-distance Doppler-shift (RDDS) method using a plunger device and ten Compton-suppressed HPGe detectors at the HI-13 tandem accelerator of CIAE-Beijing facility. ¹³⁴Ce; deduced B(E2) values for the first 2+ and 4+ states, and second 10+ and 12+ states. Comparison with interacting boson model calculations. Systematics of B(E2) for first 2+ states, E(first 4+)/E(first 2+), and B(E2)(first 4+)/B(E2)(first 2+) for ^{126,128,130,132,134,136,138}Ce, and comparison with predictions of IBM-1 calculations.

doi: 10.1103/PhysRevC.95.014308