Elsevier

Nuclear Physics A

Volume 373, Issue 3, 18 January 1982, Pages 397-433
Nuclear Physics A

Rotational bands in 152Sm observed following the (α, 2nγ) reaction

https://doi.org/10.1016/0375-9474(82)90542-5Get rights and content

Abstract

The level structure of 152Sm has been studied with various spectroscopic techniques using the (α, 2nγ) reaction. Seven rotational bands were identified up to spin values of 9 to 14ħ, viz. the ground-state band, the β- and γ-bands, and four negative-parity bands (NPB's). In the β-band a beginning of backbending or upbending was observed at I ⋍ 14h̵. Two of the NPB's are based upon collective states; the lowest can be interpreted as an aligned octupole band, the other one shows two-quasiparticle characteristics at high spin. The properties of the other NPB's are consistent with Kπ = 5 and Kπ = 7 two-quasiparticle configurations of the bandheads. At high spin these bands are strongly mixed.

Excitation energies for all bands with a collective bandhead, as well as B(rmE1) and B(E2) branching ratios and (for the β-band) X(E0/E2) ratios, were compared with IBA calculations.

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