Isomeric states in proton-unbound isotopesA. Hürstel1, M. Rejmund1, E. Bouchez1, P.T. Greenlees2, K. Hauschild1, S. Juutinen2, H. Kettunen2, W. Korten1, Y. Le Coz1, P. Nieminen2, Ch. Theisen1, A.N. Andreyev3, F. Becker1, T. Enqvist2, P.M. Jones2, R. Julin2, H. Kankaanpää2, A. Keenan2, P. Kuusiniemi2, M. Leino2, A.-P. Leppänen2, M. Muikku2, J. Pakarinen2, P. Rahkila2 and J. Uusitalo2
1 DAPNIA/SPhN CEA-Saclay 91191 Gif-sur-Yvette Cedex, France
2 JYFL, University of Jyväskylä, Finland
3 Department of Physics, University of Liverpool, UK
(Received: 2 May 2002 / Published online: 19 November 2002)
Prompt and delayed gamma-ray spectroscopy of very neutron-deficient bismuth isotopes has been performed using the Recoil Decay Tagging (RTD) method. The isomeric i13/2 states have been identified and their lifetimes have been measured. The systematics of these long-lived M2 isomers has been extended to the proton-unbound isotopes. The general behaviour of single-proton states is discussed within the systematics and interpreted within the shell-model framework.
23.20.Lv - Gamma transitions and level energies.
27.70.+q - .
21.10.Tg - Lifetimes.
© Società Italiana di Fisica, Springer-Verlag 2002