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Lifetimes and shape-coexisting states of 99Zr

Spagnoletti, P., Simpson, G., Kisyov, S., Bucurescu, D., Régis, J.-M., Saed-Samii, N., Blanc, A., Jentschel, M., Köster, U., Mutti, P. , Soldner, T., de France, G., Ur, C. A., Urban, W., Bruce, A. M., Bernards, C., Drouet, F., Fraile, L. M., Gaffney, L. P., Ghită, D. G., Ilieva, S., Jolie, J., Korten, W., Kröll, T., Lalkovski, S., Larijarni, C., Lică, R., Mach, H., Mărginean, N., Paziy, V., Podolyak, Zs., Regan, P. H., Scheck, M., Smith, J. F., Thiamova, G., Townsley, C., Vancraeyenest, A., Vedia, V., Warr, N., Werner, V. and Zielińska, M. (2019) Lifetimes and shape-coexisting states of 99Zr Physical Review C, 100 (1), 014311. 014311-1.

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Abstract

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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Spagnoletti, P.
Simpson, G.
Kisyov, S.
Bucurescu, D.
Régis, J.-M.
Saed-Samii, N.
Blanc, A.
Jentschel, M.
Köster, U.
Mutti, P.
Soldner, T.
de France, G.
Ur, C. A.
Urban, W.
Bruce, A. M.
Bernards, C.
Drouet, F.
Fraile, L. M.
Gaffney, L. P.
Ghită, D. G.
Ilieva, S.
Jolie, J.
Korten, W.
Kröll, T.
Lalkovski, S.
Larijarni, C.
Lică, R.
Mach, H.
Mărginean, N.
Paziy, V.
Podolyak, Zs.Z.Podolyak@surrey.ac.uk
Regan, P. H.P.Regan@surrey.ac.uk
Scheck, M.
Smith, J. F.
Thiamova, G.
Townsley, C.
Vancraeyenest, A.
Vedia, V.
Warr, N.
Werner, V.
Zielińska, M.
Date : 16 July 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.100.014311
Copyright Disclaimer : Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Depositing User : Clive Harris
Date Deposited : 17 Jul 2019 14:54
Last Modified : 17 Jul 2019 14:55
URI: http://epubs.surrey.ac.uk/id/eprint/852269

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