Eur. Phys. J. A (2006) 28: 271-275
https://doi.org/10.1140/epja/i2006-10060-6

Nuclear Structure and Reactions

Observation of a πh_9/2 ⊗ νi_13/2 oblate band in ¹⁸⁸Tl

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

^* e-mail: zxh@impcas.ac.cn

Received: 14 March 2006
Accepted: 14 June 2006
Published online: 3 July 2006

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.