Eur. Phys. J. A 15, 329-334 (2002)
DOI: 10.1140/epja/i2002-10032-x

Isomeric states in proton-unbound isotopes

A. 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. Uusitalo<sup>2

1</sup>  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)

Abstract
Prompt and delayed gamma-ray spectroscopy of very neutron-deficient bismuth isotopes has been performed using the Recoil Decay Tagging (RTD) method. The isomeric i_13/2 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.

PACS
23.20.Lv - Gamma transitions and level energies.
27.70.+q - .
21.10.Tg - Lifetimes.

© Società Italiana di Fisica, Springer-Verlag 2002