High-K Isomers in 176W and Mechanisms of K-Violation

Details High-K Isomers in 176W and Mechanisms of K-Violation High-K Isomers in 176W and Mechanisms of K-Violation

1995-02-21

arxiv.org/abs/nucl-ex/9502002v1

Phys.Rev.C53:1173-1190,1996

Physics

Nuclear Physics

Nuclear Experiment

47 pages, Latex; postscript figures available at http://www.phy.anl.gov/bgo/bc/w176/w176.html; submitted to Phys. Rev. C, 6

Scientific paper

10.1103/PhysRevC.53.1173

An isomer, with t1/2 = 35 +- 10 ns and J, Kpi = 14, 14+, has been observed in the nucleus 176W using the reaction 150Nd(30Si,4n) at a beam energy of 133 MeV. The isomer exhibits an unusual pattern of decay in which the _majority_ of the flux proceeds directly to states with =0, bypassing available levels of intermediate K. This severe breakdown of normal K-selection rules in 176W is compared with recent observations of K-violation in neighboring nuclei, within the framework of proposed theoretical approaches. The available data on these K-violating decays seem to have a consistent explanation in models of K-mixing which include large-amplitude fluctuations of the nuclear shape.

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