Detailed spectroscopy of the neutron-deficient bismuth isotopes ¹⁹³,¹⁹⁵Bi
Two experiments aiming to study the shape coexistence and competing structures
in 193Bi and 195Bi isotopes have been performed at the Accelerator laboratory
of the University of Jyv askyl a, Finland (JYFL). Many new states have
been found, hugely extending the previously known level schemes for both isotopes.
The i13=2 bands were extended up to I = 45/2+ in both the 193;195Bi
isotopes. In case of 193Bi, the I = 31/2+ member of the i13=2 band was
found to de-excite also to a long-lived isomeric state. This link determines the
energy of the isomeric state to be 2350(1) keV and suggests a spin and parity
of 29/2+. The half-life of the isomeric state was measured to be 85(3) s. A
level structure on top of this isomeric state was constructed. The newly observed
49 keV E2 transition provides a link between the (29/2) isomeric state
and lower-lying structures in 193Bi. A superdeformed band almost identical
to that present in the neighboring isotope 191Bi has been identified. Both the
29/2+ and (29/2) isomeric states, together with the full decay-paths have
also been identified in 195Bi. In both isotopes, the decay cascades from 31/2+
states to the 29/2+ isomeric states are surprisingly similar. Compared to 193Bi,
measured half-lives of these isomeric states are considerably shorter in 195Bi.
Experimental evidence is given proving the smaller quadrupole deformations in
195Bi when compared to 193Bi nucleus. Moreover, several new rotational collective
structures have been identified in 195Bi, even though their variety is not
as rich as in 193Bi. This is the first time the collective structures have been observed
up to a high spins and excitation energies in 195Bi. Strong manifestation
of shape coexistence is thus proved to be present also in 195Bi.
Keywords:
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University of JyväskyläISBN
978-951-39-6439-9ISSN Search the Publication Forum
0075-465XKeywords
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