Elsevier

Nuclear Physics A

Volume 600, Issue 3, 15 April 1996, Pages 283-334
Nuclear Physics A

Decay of mass-separated 189mHg (8.7 min) and 189gHg (7.7 min) to 189Au

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Abstract

The decays of 189Hg (8.7 min; Jπ = 132+) and 189Hg (7.7 min; Jπ = 32) have been studied with mass-separated sources from the UNISOR facility. Multiscaled spectra of γ-rays, X-rays, and conversion electrons, as well as γγt, γXt, eγt, and eXt coincidences were obtained. Decay schemes have been constructed incorporating > 95% of the decay intensities assigned to the high-spin and low-spin decays. The γ-ray gated conversion-electron spectra permitted the determination of 119 conversion-electron subshell ratios. Portions of the level scheme bear a remarkable resemblance to the heavier and lighter odd-mass Au isotopes. An extensive band of states is observed built upon the h92 intruder state at 325 keV. This band is markedly different from the corresponding bands in 187Au and 185Au, indicating a major change in the cores, i.e. between 188Pt and 186,184Pt. Evidence for oblate-hole-prolate-particle symmetry in 189Au is discussed. Completeness of complex decay schemes far from stability is addressed.

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