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Bochum 1998 – scientific programme

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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. Börner21Technische 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.

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