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HK: Hadronen und Kerne
HK 50: Spectroscopy: 130 ≤ A ≤ 180
HK 50.7: Talk
Wednesday, March 18, 1998, 16:00–16:15, D
Spinabhängigkeit der E1 Übergangsmomente im 150Sm — •C. Doll1,2, W. Andrejtscheff3,2, F. Bečvář4, and H. G. Börner2 — 1Technische Universität München, 85748 Garching, Germany — 2Institut Laue-Langevin, 38042 Grenoble Cedex 9, France — 3Institute for Nuclear Research and Nuclear Energy,1784 Sofia, Bulgaria — 4Charles University, Faculty of Mathematics and Physics, 18000 Prague, Chech Republic
To obtain absolute E1 collective transition rates in 150Sm, the lifetimes
of the lowest 1−, 3−, 5− and 7−
states have been measured at the high-flux ILL reactor with the GRID method.
Lifetime values between 126fs (1−) and 725fs (7−) have been found.
Higher up to spin J=18, B(E1) values have been estimated from
experimental B(E1)/B(E2) ratios. The E1 transition moments reveal a
characteristic spin behaviour. They peak at J=5-7 and are lowest in the region
11≤ J ≤15 where previous studies suggest enhanced octupole
collectivity. In addition, a staggering of the E1 moments with odd and even J
values occurs suggesting quadrupole-octupole coupling.
A speculative scenario is required in order to reconcile present and previous
results and conclusions on the spin region of octupole enhancement.