Abstract
A NaI sum-spectrometer combined with Ge-counters has been used to characterize the members of the island of high spin isomers nearN=82. On the basis of half lives, totalγ-decay energies and discreteγ-lines, assignments of 22 isomers are given or confirmed. The isomers are localized to the region 82≦N≦86 andZ≦68, and the excitation energies vary from 3 MeV to 12.2 MeV. An empirical relation between spin and excitation energy is presented and on this basis isomeric spin values up to (33±2)ħ are deduced. The isomers are thought to be due to strong alignment of 2 to 8 shell-model particles in a spherical or possibly weakly oblate potential.
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On leave from Istituto Nazionale de Fisica Nucleare, Catania, Italy
We wish to thank the UNILAC crew for their help during the experiments, N. Angert for help with the installation of the beam chopper, and H. Folger, S. Dahl, and J. Sørensen for preparing the targets. Private communications, prior to publication, have been of great help to us in analyzing the results and making isotopic assignments, and we wish especially to thank M.L. Halbert [12], T.L. Khoo [16], G. Bastin [20], D.C.J.M. Hagemann et al. [21], K. Lister [23] and R. Broada et al. [13] for their kind collaboration and for stimulating discussions and correspondence. This work was supported by the Danish Natural Science Research Council.
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Borggreen, J., Bjørnholm, S., Christensen, O. et al. Gamma-spectroscopy within the island of high-spin isomers nearN=82. Z Physik A 294, 113–124 (1980). https://doi.org/10.1007/BF01435046
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DOI: https://doi.org/10.1007/BF01435046