Abstract
The following meanlives of levels in72Se have been measured using the recoildistance Doppler-shift method:Τ(2+, 862 keV)=3.1±0.6 ps,Τ(2+′, 1317 keV)=12.5±2.6 ps,Τ(4+, 1638 keV)=1.2±0.3 ps andΤ(6+, 2469 keV)≦0.7 ps. These meanlives yield sixB(E2) values which are discussed together with the known data of the depopulation of the excited 0+′ state at 937 keV. Systematics of 0+′ states in the mass region 70≲A≲100 show that the low excitation energy of the 0+′ states is correlated with subshell closures. This suggests that the previous interpretation of the 0+′ state in72Se as a rotational band head is questionable.
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On leave of absence from University of Arizona, Tucson, Arizona, USA.
On leave of absence from Atomic Energy of Canada Ltd., Chalk River, Ontario, Canada.
The authors would like to thank Dr. Dickmann and Prof. Dr. Dietrich for performing the potential energy calculations. The authors are grateful to Prof. Dr. K. Dietrich, Dr. G. Holzwarth and Dr. E. Nolte for valuable discussions.
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Löbner, K.E.G., Dannhäuser, G., Donahue, D.J. et al. Nuclear structure of low-lying 0+ states in Ge and Se isotopes. Z Physik A 274, 251–257 (1975). https://doi.org/10.1007/BF01437737
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DOI: https://doi.org/10.1007/BF01437737