Level structure above the 17+ isomeric state in 152 69 Tm83
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
Published in
Physical Review CAuthors
Khan, S. |
Date
2018Copyright
© 2018 American Physical Society
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