Eur. Phys. J. A (2006) 30: 347-350
https://doi.org/10.1140/epja/i2006-10146-1

Letter

High-spin levels based on the 11/2^- isomer in ¹³⁵Ba

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

^* e-mail: chexl02@mails.tsinghua.edu.cn

Received: 18 September 2006
Accepted: 12 November 2006
Published online: 27 November 2006

Abstract

High-spin states in the ¹³⁵Ba nucleus have been studied with the reaction ¹³⁰Te(⁹Be, 4n) at a beam energy of 45 MeV. The level scheme based on the h _11/2 isomer has been expanded with spins up to 35/2 ℏ. At low spins, the yrast collective structure built on the ν h _11/2 ^-1 multiplet may show a transitional shape with γ > 30^° according to the systematical behavior observed in neighboring nuclei as well as the calculations of the triaxial rotor-plus-particle model. The configurations for several high-spin states have been discussed from a systematical comparison with neighboring isotones.