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首页> 美国政府科技报告 >Shape Coexistence Near the Z-82 Closed Shell: A Study of the Excited States of exp 187 Au and exp 187 Pt in the beta exp + Decay of exp 187 Hg and exp 187 Au
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Shape Coexistence Near the Z-82 Closed Shell: A Study of the Excited States of exp 187 Au and exp 187 Pt in the beta exp + Decay of exp 187 Hg and exp 187 Au

机译：Z-82闭壳附近的形状共存：探测187 exp中的exp 187 au和exp 187 pt的激发态+ exp 187 Hg和exp 187 au的衰变

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The decays of mass-separated (2.4, 2.2 min)/sup 187m,g/Hg and (8.4 min) exp 187 Au were studied. Both high- and low-spin states in exp 187 Au are fed in the ( beta exp + , EC) decay of /sup 187m,g/Hg isomers. The h/sub 11/2/, h/sub 9/2/, s/sub 1/2/, d/sub 3/2/, and d/sub 5/2/ collective bands, which are systematically observed throughout the odd-mass gold isotopes, are now extended to exp 187 Au. In exp 187 Au, the h/sub 9/2/ bandhead is below the h/sub 11/2/ bandhead, and the transition between the two is found to proceed via a hindered M1 transition due to the change in nuclear shape involved in the transition. One of the most important results of the present study is the discovery of the coupling of the odd proton in an h/sub 9/2/ particle state to the excited O exp + state of the exp 186 Pt core. Only the low spin states in exp 187 Pt appear to be populated in the beta decay of exp 187 Au. The nature of these low-spin states is not understood at present. One aspect of the levels of exp 187 Pt not previously reported is a delayed transition of 251 keV energy observed in the present study. 111 references. (ERA citation 05:002139)

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