Elsevier

Physics Letters B

Volume 752, 10 January 2016, Pages 311-316
Physics Letters B

Impact of triaxiality on the rotational structure of neutron-rich rhenium isotopes

https://doi.org/10.1016/j.physletb.2015.11.056Get rights and content
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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 gamma-vibrational 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.

Keywords

γ-Ray spectroscopy
Neutron-rich
Shape transition
Triaxiality

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