From detailed spectroscopy of Cd110 and Cd112 following the β+/EC decay of In110,112 and the β- decay of Ag112, the presence of very weak decay branches from nonyrast states is revealed. In Cd112, 25+→04+ and 46+→25+ transitions are observed that yield B(E2;25+→04+)=34±15 W.u. and B(E2;46+→25+)=77±30 W.u., respectively, clearly indicating a collective structure. In Cd110, a weak decay branch from the 46+ level to the 25+ level is observed, and from a lifetime measurement following the (n,n′γ) reaction, B(E2;46+→25+)=55±14 W.u. is determined. A new branch is also observed for the decay of the 64+ level to the 46+ state, indicating that the sequence 25+, 46+, and 64+ forms part of a collective structure. The presence of 33+ and 52+ levels spaced between the previous sequence is highly suggestive of a γ band built on the 02+ shape-coexisting intruder state. The 04+ levels in Cd110,112,114 have preferred decays to the lowest 2+ members of the intruder bands, and for Cd114 a previous measurement had established an enhanced B(E2;04+→23+). The energy systematics of the 02+, 03+, and 04+ levels all display the characteristic parabolic-shaped pattern, suggesting that they are built on multiparticle-multihole proton excitations. The results are compared with beyond-mean-field calculations that reproduce qualitatively the observed levels and their decays and suggest that the 01+, 02+, 03+, and 04+ levels and the excited states built on them possess different deformations.
|Journal||Physical Review C|
|State||Published - Apr 2020|
Bibliographical noteFunding Information:
The assistance of Dr. F. Corminboeuf and Dr. L. Genilloud in the collection of the data is gratefully acknowledged, as are discussions with M. Zielińska and A. Gezerlis. This work was supported in part by the Natural Sciences and Engineering Research Council (Canada), TRIUMF through the National Research Council (Canada), and the US National Science Foundation under Grant No. PHY-1913028. T.R.R. acknowledges computing time at GSI-Darmstadt and support from Spanish MINECO under Grant No. FIS-2014-53434-P.
© 2020 American Physical Society. US.
ASJC Scopus subject areas
- Nuclear and High Energy Physics