Detailed spectroscopy of 193Bi
Herzan, A., Juutinen, S., Auranen, K., Grahn, T., Greenlees, P., Hauschild, K., . . . Uusitalo, J. (2015). Detailed spectroscopy of 193Bi. Physical Review C, 92 (4), 044310. doi:10.1103/PhysRevC.92.044310
Published in
Physical Review CAuthors
Date
2015Copyright
© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
An experiment aiming to study shape coexistence in 193Bi has been performed. Due to its transitional character,
it has an exceptionally large number of structures identified close to the yrast line. Many new states have been
found, significantly extending the previously known level scheme of 193Bi, including several new rotational
bands. The π i13/2 band was extended to I π = 45/2+. The I π = 31/2+ member of the π i13/2 band was found
to de-excite also to a long-lived isomeric state. This isomeric state is located at 2350 keV and has a spin and
parity of 29/2+. The half-life of the isomeric state was measured to be 85(3) μs and it decays via the emission
of an 84 keV E2 transition. A level structure feeding this isomeric state was constructed. A low-energy, 49 keV
transition has been identified to depopulate the (29/2−) isomeric state, which places it at an energy 2405 keV
in the level scheme. This is the first time such a decay has been observed in the neutron-deficient Bi isotopes.
A superdeformed band almost identical to that present in the neighboring isotope 191Bi, based on the 1/2[651]
Nilsson orbital, has also been identified.
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