Shape coexistence in light krypton isotopes

E Clement*, A Gorgen, E Bouchez, A Chatillon, W Korten, Y Le Coz, C Theisen, C Andreoiu, F Becker, B Blank, C Borcea, A Buta, P Butler, JM Casandjian, WN Catford, T Czosnyka, A Emsallem, G de France, J Genevey, J GerlF Hannachi, K Hauschild, RD Herzberg, A Hurstel, J Iwanicki, D Jenkins, G Jones, M Lewitowicz, R Lucas, I. Matea, F Negoita, FD Santos, D Pantelica, J Pinston, P Rahkila, M Rejmund, G Sletten, M Stanoiu, C Timis, R Wadsworth, JN Wilson, M Zielinska

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Shape coexistence in the light krypton isotopes was studied in a series of experiments at GANIL using various experimental techniques. A new low-lying 0(+) state, a so-called shape isomer, was found in delayed conversion-electron spectroscopy after fragmentation reactions. The systematics of such low-lying 0(+) states suggests that the ground states of the isotopes Kr-78 and Kr-76 have prolate deformation, while states with prolate and oblate shape are practically degenerate and Strongly Mixed M Kr-74, and that the oblate configuration becomes the ground state in Kr-72. This scenario was tested in experiments performing low-energy Coulomb excitation of radioactive Kr-76 and Kr-74 beams from the SPIRAL facility. Both transitional and diagonal electromagnetic matrix elements were extracted from the observed gamma-ray yields. The results find the prolate shape for the ground-state bands in Kr-76 and Kr-74 and an oblate deformation for the excited 2(2)(+) State in Kr-74, confirming the proposed scenario of shape coexistence.

Original languageEnglish
Title of host publicationNuclei at the Limits
EditorsD Seweryniak, TL Khoo
Place of PublicationMELVILLE
PublisherAmerican Institute of Physics
Number of pages7
ISBN (Print)0-7354-0249-3
Publication statusPublished - 2005
EventConference on Nuclei at the Limits - Argonne, Israel
Duration: 26 Jul 200430 Jul 2004

Publication series

ISSN (Print)0094-243X


ConferenceConference on Nuclei at the Limits


  • KR-74

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