Eur. Phys. J. A (2005) 24: 199-204
https://doi.org/10.1140/epja/i2004-10136-3

Original Article

High-spin states and band structures in the doubly odd ¹³⁶La nucleus

¹ Department of Physics, Tsinghua University, 100084, Beijing, PRC
² China Institute of Atomic Energy, 102413, Beijing, PRC

^* e-mail: zhushj@mail.tsinghua.edu.cn

Received: 25 November 2004
Accepted: 2 February 2005
Published online: 11 March 2005

Abstract

High-spin states of ¹³⁶La have been investigated with the reaction ¹³⁰Te( ¹¹B, 5n) at a beam energy of 60 MeV. The level scheme with three collective bands has been updated with spin up to 20 ℏ. The observed πh _11/2 ⊗ νh _11/2 band shows γ-instability with increasing spin according to the TRS calculations. The band crossing and the signature splitting and inversion have been discussed. Other two collective bands based on 12^-and 16⁺ levels were proposed as oblate deformation with γ ∼ -60^°. They most probably originate from four- and six-quasiparticle configurations, that is, πh _11/2 ⊗ νg _7/2 h _11/2 ² and πg _7/2 ⊗ νg _7/2 ² d _5/2 h _11/2 ² respectively.