Decreasing Collectivity in Smoothly Terminating Bands in the {ital A} {approximately} 110 Region

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.80.1174· OSTI ID:568345

Wadsworth, R; Hibbert, I M; Parry, C M ^[1]; Clark, R M; Kruecken, R; Lee, I Y; Macchiavelli, A O ^[2]; Cameron, J A ^[3]; Fossan, D B; Lane, G J; Sears, J M; Smith, J F ^[4]; Janzen, V P ^[5]; Afanasjev, A V; Ragnarsson, I ^[6]

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1. Department of Physics, University of York, Heslington, York, YO1 5DD (United Kingdom)
2. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
3. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (CANADA)
4. Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800 (United States)
5. Chalk River Laboratories, Atomic Energy of Canada Ltd., Chalk River, Ontario, K0J 1J0 (CANADA)
6. Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund (Sweden)

Lifetimes of states in two rotational bands in {sup 108}Sn and one in {sup 109}Sb have been determined using the Doppler shift attenuation method. The deduced quadrupole moments for the states are in excellent agreement with cranked Nilsson model predictions, which imply a gradual change in the nuclear shape from collective near-prolate at medium spin to noncollective oblate at high spin. This change results from the gradual alignment of the spin vectors of the valence particles and holes in a specific configuration. These data provide crucial evidence in support of the phenomenon of smooth band termination. {copyright} {ital 1998} {ital The American Physical Society}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 568345
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIMONY 109
ATTENUATION
COLLECTIVE MODEL
CRANKING MODEL
DOPPLER EFFECT
EXCITATION
HIGH SPIN STATES
LIFETIME
QUADRUPOLE MOMENTS
ROTATIONAL STATES
SHAPE
TIN 108