Deformed ground states and double backbending at high spins in light Kr isotopes

The energy levels in /sup 74,76/Kr have been studied with a range of in-beam, gamma -spectroscopy techniques following heavy-ion reactions and in /sup 76/Kr via the radioactive decay of /sup 76/Rb. Breaks in the level energies and moments of inertia in /sup 74,76/Kr are observed at low spins. These...

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Detalles Bibliográficos
Autores principales: Hamilton, J H, Carter, H K, Cleemann, L, Döring, J, Eberth, J, Frauendorf, S, Funke, L, Heck, T, Kim, H J, Lin, J, Maguire, C F, Neumann, W, Nolte, M, Piercey, R B, Ramayya, A V, Rester, A C, Robinson, R L, Roth, J, Soundranayagam, R, Sun, X J, Wells, J C, Winter, G, Zhao, Z Z
Lenguaje:eng
Publicado: CERN 1981
Materias:
Nuclear Physics
Acceso en línea:https://dx.doi.org/10.5170/CERN-1981-009.391
http://cds.cern.ch/record/878085
Descripción
Sumario:The energy levels in /sup 74,76/Kr have been studied with a range of in-beam, gamma -spectroscopy techniques following heavy-ion reactions and in /sup 76/Kr via the radioactive decay of /sup 76/Rb. Breaks in the level energies and moments of inertia in /sup 74,76/Kr are observed at low spins. These data can be understood in terms of the crossing of bands built on near-spherical and deformed shapes with the ground states having very large deformation. In /sup 74/Kr the yrast cascade is observed to a tentative 20/sup +/ level. Double backbending of J is observed at spins of 12/sup +/ and 16/sup +/. These changes are interpreted in terms of rotation-aligned structures. (17 refs).

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