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Observation of a πh9/2 ? νi13/2 oblate band in 188Tl |
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| Authors: | X H Zhou L Ma Y B Xing Y H Zhang Y X Guo X G Lei C Y Xie M Oshima Y Toh M Koizumi A Osa Y Hatsukawa M Sugawara M M Ndontchueng |
| Institution: | (1) Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, PRC;(2) Japan Atomic Energy Research Institute, 319-1195 Ibaraki, Japan;(3) Chiba Institute of Technology, 275-0023 Chiba, Japan;(4) University of Douala, P. O. Box 24157, Douala, Cameroon |
| Abstract: | Excited states in 188Tl have been studied experimentally using the 157Gd (35Cl, 4n) reaction at a beam energy of 170MeV. A rotational band built on the πh 9/2 ⊗ νi 13/2 configuration with oblate deformation has been established for 188Tl. Based on the structure systematics of the oblate πh 9/2 ⊗ νi 13/2 bands in the heavier odd-odd Tl nuclei, we have tentatively proposed spin values for the new band in 188Tl. The πh 9/2 ⊗ νi 13/2 oblate band in 188Tl shows low-spin signature inversion, and it can be interpreted qualitatively by the two-quasiparticle plus rotor model including a J-dependent p-n residual interaction. |
| Keywords: | 21 10 Re Collective levels 23 20 -g Electromagnetic transitions 23 20 Lv gamma transitions and level energies 27 70 +q 150 ⩽ A ⩽ 189 |
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