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Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing

Régis, J.-M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T. , Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clément, E., Stezowski, O., Ur, C. A., Urban, W., Regan, Patrick, Podolyak, Zsolt, Larijani, Cyrus Kouroush, Townsley, C., Carroll, R., Wilson, E., Fraile, L. M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Scheck, M., Kröll, T., Hartig, A.-L., Ignatov, A., Ilieva, S., Lalkovski, S., Korten, W., Mărginean, N., Otsuka, T., Shimizu, N., Togashi, T. and Tsunoda, Y. (2017) Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing Physical Review C, 95 (5), 054319. 054319-1-054319-7.

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Abstract

Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Régis, J.-M.UNSPECIFIEDUNSPECIFIED
Jolie, J.UNSPECIFIEDUNSPECIFIED
Saed-Samii, N.UNSPECIFIEDUNSPECIFIED
Warr, N.UNSPECIFIEDUNSPECIFIED
Pfeiffer, M.UNSPECIFIEDUNSPECIFIED
Blanc, A.UNSPECIFIEDUNSPECIFIED
Jentschel, M.UNSPECIFIEDUNSPECIFIED
Köster, U.UNSPECIFIEDUNSPECIFIED
Mutti, P.UNSPECIFIEDUNSPECIFIED
Soldner, T.UNSPECIFIEDUNSPECIFIED
Simpson, G. S.UNSPECIFIEDUNSPECIFIED
Drouet, F.UNSPECIFIEDUNSPECIFIED
Vancraeyenest, A.UNSPECIFIEDUNSPECIFIED
de France, G.UNSPECIFIEDUNSPECIFIED
Clément, E.UNSPECIFIEDUNSPECIFIED
Stezowski, O.UNSPECIFIEDUNSPECIFIED
Ur, C. A.UNSPECIFIEDUNSPECIFIED
Urban, W.UNSPECIFIEDUNSPECIFIED
Regan, PatrickP.Regan@surrey.ac.ukUNSPECIFIED
Podolyak, ZsoltZ.Podolyak@surrey.ac.ukUNSPECIFIED
Larijani, Cyrus Kouroushc.larijani@surrey.ac.ukUNSPECIFIED
Townsley, C.UNSPECIFIEDUNSPECIFIED
Carroll, R.UNSPECIFIEDUNSPECIFIED
Wilson, E.UNSPECIFIEDUNSPECIFIED
Fraile, L. M.UNSPECIFIEDUNSPECIFIED
Mach, H.UNSPECIFIEDUNSPECIFIED
Paziy, V.UNSPECIFIEDUNSPECIFIED
Olaizola, B.UNSPECIFIEDUNSPECIFIED
Vedia, V.UNSPECIFIEDUNSPECIFIED
Bruce, A. M.UNSPECIFIEDUNSPECIFIED
Roberts, O. J.UNSPECIFIEDUNSPECIFIED
Smith, J. F.UNSPECIFIEDUNSPECIFIED
Scheck, M.UNSPECIFIEDUNSPECIFIED
Kröll, T.UNSPECIFIEDUNSPECIFIED
Hartig, A.-L.UNSPECIFIEDUNSPECIFIED
Ignatov, A.UNSPECIFIEDUNSPECIFIED
Ilieva, S.UNSPECIFIEDUNSPECIFIED
Lalkovski, S.UNSPECIFIEDUNSPECIFIED
Korten, W.UNSPECIFIEDUNSPECIFIED
Mărginean, N.UNSPECIFIEDUNSPECIFIED
Otsuka, T.UNSPECIFIEDUNSPECIFIED
Shimizu, N.UNSPECIFIEDUNSPECIFIED
Togashi, T.UNSPECIFIEDUNSPECIFIED
Tsunoda, Y.UNSPECIFIEDUNSPECIFIED
Date : 23 May 2017
Funders : Science and Technology Facilities Council (STFC)
Identification Number : 10.1103/PhysRevC.95.054319
Copyright Disclaimer : © 2017 American Physical Society. This is the published version of the following article: Régis, J.-M. et al, 'Abrupt shape transition at neutron number N= 60: B (E 2) values in Sr 94, 96, 98 from fast γ− γ timing', in Physical Review C, 95:5, which has been published at http://dx.doi.org/10.1103/PhysRevC.95.054319. This article may be used for non-commercial purposes in accordance with the publisher's Terms and Conditions for Self-Archiving.
Depositing User : Clive Harris
Date Deposited : 08 Jun 2017 10:28
Last Modified : 31 Oct 2017 19:22
URI: http://epubs.surrey.ac.uk/id/eprint/841337

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