Lifetimes and shape-coexisting states of 99Zr

P. Spagnoletti, G. Simpson, S. Kisyov, D. Bucurescu, J-M Regis, N. Saed-Samii, A. Blanc, M. Jentschel, U. Koster, P. Mutti, T. Soldner, G. de France, C. A. Ur, W. Urban, A. M. Bruce, C. Bernards, F. Drouet, L. M. Fraile, L. P. Gaffney, D. G. GhitaS. Ilieva, J. Jolie, W. Korten, T. Kroll, S. Lalkovski, C. Larijarni, R. Lica, H. Mach, N. Marginean, V Paziy, Zs Podolyak, P. H. Regan, M. Scheck, J. F. Smith, G. Thiamova, C. Townsley, A. Vancraeyenest, V. Vedia, N. Warr, V Werner, M. Zielinska

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Lifetimes of intermediate-spin states in two rotational bands of 99Zr have been measured. These states were populated following the neutron-induced fission of 235U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus 99Zr59 exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N =58 to N =60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β2 =0.34(1) and 0.26(3) to be determined for the 821.6- and 1236.6-keV members, whereas β2 =0.32(3) was found for the 850.5-keV member of the ν3/2[411] band. Some of the excited states known in 99Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations.Type-II shell evolution is proposed to play a major role in modifying single-particle energies in 99Zr.
Original languageEnglish
Article number014311
Number of pages11
JournalPhysical Review C
Issue number1
Publication statusPublished - 16 Jul 2019


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