Sub-nanosecond Half-life Measurement of the Yrast I{sup π}=5{sup −} State in the N=78 Nucleus {sup 136}{sub 58}Ce using Fast-timing Coincident Gamma-ray Spectroscopy

• Published in: Nuclear data sheets Vol. 120
• Main Authors: Alharbi, T., Department of Physics, Faculty of Science in Zulfi, Almajmaah University, P.O. Box 1712, 11932, Regan, P.H., National Physical Laboratory, Teddington, Middlesex, TW11 0LW, Mărginean, N., Podolyák, Zs, Bajoga, A., Britton, R., Bucurescu, D., Deleanu, D., Filipescu, D., Ghită, D., Glodariu, T., Mihai, C., Mulholland, K., Mărginean, R., Negret, A., Nita, C.R., Patel, Z., Roberts, O.J., Stroe, L., Sava, T.
• Format: Journal Article
• Language: English
• Published: United States 15.06.2014
• Subjects: AXIAL SYMMETRY; CERIUM 136; GAMMA DETECTION; GAMMA SPECTROSCOPY; HALF-LIFE; HIGH-PURITY GE DETECTORS; LANTHANUM BROMIDES; NUCLEAR DECAY; NUCLEAR PHYSICS AND RADIATION PHYSICS; SCINTILLATION COUNTERS
• ISSN: 0090-3752; 1095-9904
• DOI: 10.1016/J.NDS.2014.07.006

We report on the measurement of the half-life of the yrast I{sup π}=5{sup −} state in the transitional nucleus {sup 136}Ce using a combined HPGe-LaBr3(Ce) scintillator gamma-ray detection array. The measured value for the E1 decay is approximately half a nanosecond, which corresponds to an E1 decay strength of approximately 2×10{sup −6} Wu. This value is in line with single-particle type E1 decays in this mass region and suggests no sign of additional K-hindrance associated with axially symmetric quadrupole deformations observed for lighter cerium isotopes.