Shape coexistence and multiparticle-multihole structures in Cd110,112
| Autor: | P. E. Garrett, K. L. Green, G. Hackman, A. J. Radich, V. Bildstein, M. A. Schumaker, J. C. Bangay, A. Finlay, A. C. Morton, W. D. Kulp, E. T. Rand, A. A. Phillips, J. Wong, C. J. Pearson, A. Diaz Varela, S. W. Yates, D. S. Cross, A. B. Garnsworthy, S. Colosimo, B. Jigmeddorj, P. Finlay, Chandana Sumithrarachchi, N. Warr, K. G. Leach, Rae Austin, G. C. Ball, Tomás R. Rodríguez, J. Jolie, C. E. Svensson, G. F. Grinyer, S. Triambak, J. N. Orce, G. A. Demand, D. Bandyopadhyay, J. L. Wood |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review C. 101 |
| ISSN: | 2469-9993 2469-9985 |
| Popis: | From detailed spectroscopy of Cd-110 and Cd-112 following the beta(+)/EC decay of In-110,In-112 and the beta(-) decay of Ag-112, the presence of very weak decay branches from nonyrast states is revealed. In Cd-112, 2(5)(+) -> 0(4)(+) and 4(6)(+) -> 2(5)(+) transitions are observed that yield B(E2; 2(5)(+) -> 0(4)(+)) = 34 +/- 15 W.u. and B(E2; 4(6)(+) -> 2(5)(+)) = 77 +/- 30 W.u., respectively, clearly indicating a collective structure. In 110Cd, a weak decay branch from the 4(6)(+) level to the 2(5)(+) level is observed, and from a lifetime measurement following the (n, n gamma' reaction, B(E2; 4(6)(+) -> 2(5)(+)) = 55 +/- 14 W.u. is determined. A new branch is also observed for the decay of the 6(4)(+) level to the 4(6)(+) state, indicating that the sequence 2(5)(+), 4(6)(+), and 6(4)(+) forms part of a collective structure. The presence of 3(3)(+) and 5(2)(+) levels spaced between the previous sequence is highly suggestive of a gamma band built on the 0(2)(+) shape-coexisting intruder state. The 0(4)(+) levels in Cd-110,Cd-112,Cd-114 have preferred decays to the lowest 2(+) members of the intruder bands, and for 114Cd a previous measurement had established an enhanced B(E2; 0(4)(+) -> 2(3)(+)). The energy systematics of the 0(2)(+), 0(3)(+), and 0(4)(+) 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 0(1)(+), 0(2)(+), 0(3)(+), and 0(4)(+) levels and the excited states built on them possess different deformations. |
| Databáze: | OpenAIRE |
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