Elsevier

Nuclear Physics A

Volume 339, Issue 3, 5 May 1980, Pages 415-428
Nuclear Physics A

Discovery of a very low-lying 0+ state in 98Sr and shape coexistence implication in 98Sr

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Abstract

Using the on-line mass separator OSTIS for studies of short-lived fission products, we found two modes for the β-decay of 98Rb with respective half-lives of 96 and 114 ms. The latter decay populates a 0+ state in 98Sr at the unusually low energy of 215.5 keV, which is by far the lowest 0+ excited state observed in even-even nuclei. The half-lives of the 0+ and the 21+ states in 98Sr were found to be respectively 25 ns and 4 ns. The transition probabilities, the reduced E0 matrix element and the observed level structure suggest shape coexistence for 98Sr: the spheroidal 01+ ground state shows a rotational band with the 2+, 4+, (6+) levels, whereas the presumably spherical 02+ excited state may be connected with the 2+ level of a vibrational band. A simple model is proposed.

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