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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.

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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 :
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.
Larijani, Cyrus
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.
Tsunoda, Y.
Date : 23 May 2017
Funders : Science and Technology Facilities Council (STFC)
DOI : 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 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 : 11 Dec 2018 11:23

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