Level structure above the 17⁺ isomeric state in ¹⁵²₆₉Tm₈₃
Singh, B. S. Nara; Cullen, D. M.; Taylor, M. J.; Srivastava, P. C.; Isacker, P. Van; Beeke, O.; Dodson, B.; Scholey, C.; O’Donell, D.; Jakobson, U.; Grahn, T.; Greenlees, P. T.; Jones, P. M.; Julin, R.; Khan, S.; Leino, M.; Leppänen, A.-P.; Eeckhaudt, S.; Mäntyniemi, K.; Pakarinen, J.; Peura, P.; Rahkila, P.; Sarén, J.; Sorri, J.; Uusitalo, J.; Venhart, M. (2018-08-28)
Singh, B. S. N., Cullen, D. M., Taylor, M. J., Srivastava, P. C., Isacker, P. V., Beeke, O., . . . Venhart, M. (2018). Level structure above the 17+ isomeric state in 152 69 Tm83. Physical Review C, 98 (2), 024319. doi:10.1103/PhysRevC.98.024319
© 2018 American Physical Society. Published in this repository with the kind permission of the publisher.
Excited states above the 17⁺ isomeric state in the proton-rich nucleus ¹⁵²Tm were established by employing the recoil-isomer tagging technique. Data were collected using the JUROGAM gamma-ray array and the GREAT spectrometer together with the recoil ion transport unit (RITU) gas-filled recoil separator and analyzed to identify the prompt and delayed γ decays from the levels in ¹⁵²Tm. Shell-model calculations, either in a large valence space or in a reduced model space with five protons in the π0h₁₁/₂ orbital and one neutron in the ν1f₇/₂ orbital, agree with the observed energies of the yrast levels up to angular momentum J = 21. The observation of near degeneracies in the energy spectrum can be attributed to specific components of the proton-neutron interaction. The isomeric decay of the 17⁺ level is not reproduced in the shell-model calculations as it arises from a delicate balance between hindrance due to seniority selection rules and enhancement due to configuration mixing.
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