Low- Z boundary of the N=88 -90 shape phase transition: Ce 148 near the critical point

P. Koseoglou, V. Werner, N. Pietralla, S. Ilieva, T. Nikšić, D. Vretenar, P. Alexa, M. Thürauf, C. Bernards, A. Blanc, A. M. Bruce, R. B. Cakirli, N. Cooper, L. M. Fraile, G. De France, M. Jentschel, J. Jolie, U. Köster, W. Korten, T. KröllS. Lalkovski, H. Mach, N. Mǎrginean, P. Mutti, Z. Patel, V. Paziy, Zs Podolyák, P. H. Regan, J. M. Régis, O. J. Roberts, N. Saed-Samii, G. S. Simpson, T. Soldner, C. A. Ur, W. Urban, D. Wilmsen, E. Wilson

Research output: Contribution to journalArticlepeer-review


Excited states of the neutron-rich nucleus Ce148 have been populated by neutron-induced fission of a U235 target. Its electromagnetic decays were studied by means of γ-ray coincidence spectroscopy with fast-timing capabilities. Lifetimes of the 21+ and 41+ states of Ce148 were obtained and their E2 decay rates deduced. The B4/2=B(E2;41+→21+)/B(E2;21+→01+) ratio indicates that Ce148 is a transitional nucleus while the N=88/90 shape phase transition evolves into a gradual change of nuclear deformation for proton numbers Z<60.

Original languageEnglish
Article number014303
JournalPhysical Review C
Issue number1
Publication statusPublished - 6 Jan 2020


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