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Title	Lifetimes and shape-coexisting states of $^{99}Zr$
Author(s)	Spagnoletti, P (West Scotland U.) ; Simpson, G (LPSC, Grenoble) ; Kisyov, S (Bucharest, IFIN-HH) ; Bucurescu, D (Bucharest, IFIN-HH) ; Régis, J M (Cologne U.) ; Saed-Samii, N (Cologne U.) ; Blanc, A (Laue-Langevin Inst.) ; Jentschel, M (Laue-Langevin Inst.) ; Köster, U (Laue-Langevin Inst.) ; Mutti, P (Laue-Langevin Inst.) ; Soldner, T (Laue-Langevin Inst.) ; de France, G (GANIL) ; Ur, C A (INFN, Padua) ; Urban, W (Warsaw U.) ; Bruce, A M (Brighton U.) ; Bernards, C (Yale U. (main)) ; Drouet, F (LPSC, Grenoble) ; Fraile, L M (UCM, Madrid, Dept. Phys.) ; Gaffney, L P (CERN) ; Ghită, D G (Bucharest, IFIN-HH) ; Ilieva, S (Darmstadt, Tech. Hochsch.) ; Jolie, J (Cologne U.) ; Korten, W (IRFU, Saclay) ; Kröll, T (Darmstadt, Tech. Hochsch.) ; Lalkovski, S (Sofiya U.) ; Larijarni, C (U. Surrey (main) ; Teddington, Natl. Phys. Lab) ; Lică, R (Bucharest, IFIN-HH) ; Mach, H (UCM, Madrid, Dept. Phys. ; NCBJ, Warsaw) ; Mărginean, N (Bucharest, IFIN-HH) ; Paziy, V (UCM, Madrid, Dept. Phys.) ; Podolyák, Zs (U. Surrey (main)) ; Regan, P H (U. Surrey (main) ; Teddington, Natl. Phys. Lab) ; Scheck, M (West Scotland U.) ; Smith, J F (West Scotland U.) ; Thiamova, G (LPSC, Grenoble) ; Townsley, C (U. Surrey (main)) ; Vancraeyenest, A (LPSC, Grenoble) ; Vedia, V (UCM, Madrid, Dept. Phys.) ; Warr, N (Cologne U.) ; Werner, V (Yale U. (main) ; Darmstadt, Tech. Hochsch.) ; Zielińska, M (IRFU, Saclay)
Publication	2019
Number of pages	11
In:	Phys. Rev. C 100 (2019) 014311
DOI	10.1103/PhysRevC.100.014311
Subject category	Nuclear Physics - Experiment
Abstract	Lifetimes of intermediate-spin states in two rotational bands of $^{99}Zr$ have been measured. These states were populated following the neutron-induced fission of $^{235}U$ at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus $^{99}Zr_{59}$ 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 $\beta_2$=0.34(1) and 0.26(3) to be determined for the 821.6- and 1236.6-keV members, whereas $\beta_2$=0.32(3) was found for the 850.5-keV member of the ν3/2[411] band. Some of the excited states known in $^{99}Zr$ 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 $^{99}Zr$.
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