Band crossings in even-even /sup 138/Sm and /sup 134/Nd

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.2380· OSTI ID:5740015

Paul, E S; Shi, S; Beausang, C W; Fossan, D B; Ma, R; Piel, Jr, W F; Xu, N; Weng, P K

The rotational alignment of h/sub 11/2/ quasiparticles has been observed in the even-even /sup 138/Sm and /sup 134/Nd nuclei by means of heavy-ion fusion-evaporation reactions. The structures observed are compared to those found recently in /sup 136/Nd. The ground-state bands of the /sup 136/Nd and /sup 138/Sm isotones (N = 76) possess significant triaxial shapes (..gamma..approx.-25/sup 0/). Rotational alignment of h/sub 11/2/ protons induces a shape change towards the prolate (..gamma.. = 0/sup 0/) shape, while h/sub 11/2/ neutron alignment induces a change towards the oblate (..gamma.. = -60/sup 0/) collective shape. In the more deformed /sup 134/Nd nucleus, band crossings are observed in both the ground-state band and the ..gamma..-vibrational band. The crossing in the ground-state band is attributed to h/sub 11/2/ protons, while a second band that feeds into both the ground-state band and the ..gamma..-vibrational band is built on the (h/sub 11/2/)/sup 2/ neutron-aligned configuration. In addition, negative-parity sidebands built on two-quasiproton configurations were seen in these nuclei. The systematics of the proton and neutron alignments are discussed.

• Research Organization: Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794
• OSTI ID: 5740015
• Journal Information: Phys. Rev. C; (United States), Vol. 36:6
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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