Elsevier

Nuclear Physics A

Volume 237, Issue 2, 13 January 1975, Pages 333-353
Nuclear Physics A

Rotational bands in 185Os and 187Os

https://doi.org/10.1016/0375-9474(75)90430-3Get rights and content

Abstract

The excited states of the odd-neutron nuclei 185Os and 187Os were investigated by in-beam γ-ray measurements using the reactions 183W(α, 2n), 187Re(d, 2n) and 187Re(p, n). High-resolution singles γ-ray spectra and γ-γ coincidence spectra were measured. In addition, excitation functions and angular distributions of the γ-rays were determined for 185Os. From the measurement of the delayed γ-radiation and the results of the γ-γ coincidence experiments, two isomers were found in 185Os at energies of 102.3 and 275.7 keV. They were interpreted, quite similar to the known isomers in 187Os, as being the Nilsson states 72[503] and 112+[615], respectively. Furthermore, in 185Os the rotational states built on the ground state 12[510] up to spin 252 as well as the rotational bands built on the two isomeric states and on the 92+[624] configuration were found. Interband transitions between some members of the bands based on the configurations 12[510] and 72[503] in 185Os indicated a strong mixing of the two I = 132 rotational members which are very close in energy. This mixing of states with a difference of 3 units in the K quantum number was described by a Coriolis coupling calculation including only first-order matrix elements. Further calculations were performed to describe the 12[510] ground state band and the strongly perturbed 112+[615] band. In 187Os, the rotational bands belonging to the Nilsson states 72[503] and 112+[615] were followed up to spin values of 172 and 192, respectively.

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