Decreasing Collectivity in Smoothly Terminating Bands in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">A</mml:mi><mml:mspace/><mml:mi>∼</mml:mi><mml:mn>110</mml:mn></mml:math>Region
R. WadsworthDepartment of Physics, University of York, Heslington, York, YO1 5DD, United KingdomR. M. ClarkNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720J. A. CameronDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1D. B. FossanDepartment of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800I. M. HibbertDepartment of Physics, University of York, Heslington, York, YO1 5DD, United KingdomV. P. JanzenChalk River Laboratories, Atomic Energy of Canada Ltd., Chalk River, Ontario, Canada K0J 1J0R. KrückenNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720G. J. LaneDepartment of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800I. Y. LeeNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720A. O. MacchiavelliNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720C. M. ParryDepartment of Physics, University of York, Heslington, York, YO1 5DD, United KingdomJ. M. SearsDepartment of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800J. F. SmithDepartment of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800A. V. AfanasjevI. Ragnarsson
1998lv
ABI
Аннотация
Lifetimes of states in two rotational bands in ${}^{108}\mathrm{Sn}$ and one in ${}^{109}\mathrm{Sb}$ 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.
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