Impact of triaxiality on the rotational structure of neutron-rich rhenium isotopes
Date
2016
Authors
Reed, Matthew
Lane, Gregory
Dracoulis, George
Kondev, Filip G
Carpenter, M P
Chowdhury, P
Hota, Sankha
Hughes, Richard
Janssens, R V F
Lauritsen, T
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Elsevier
Abstract
A number of 3-quasiparticle isomers have been found and characterised in the odd-mass, neutron-rich, 187Re, 189Re and 191Re nuclei, the latter being four neutrons beyond stability. The decay of the isomers populates states in the rotational bands built upon the 9/2−[514] Nilsson orbital. These bands exhibit a degree of signature splitting that increases with neutron number. This splitting taken together with measurements of the M1/E2 mixing ratios and with the changes observed in the energy of the gammavibrational band coupled to the 9/2−[514] state, suggests an increase in triaxiality, with γ values of 5◦,
18◦ and 25◦ deduced in the framework of a particle-rotor model.
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Physics Letters B
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Journal article
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Open Access
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