Eur. Phys. J. A (2005) 25: 345-354
https://doi.org/10.1140/epja/i2005-10131-2

Original Article

Rotational structures in ¹²³Cs

¹ Department of Physics, Panjab University, 160 014, Chandigarh, India
² Institute of Physics, 751 005, Bhubaneswar, India
³ Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
⁴ Nuclear Science Centre, Aruna Asaf Ali Marg, 110 067, New Delhi, India

^* e-mail: nsingh@pu.ac.in

Received: 20 April 2005
Accepted: 26 July 2005
Published online: 5 October 2005

Abstract

High-spin states in ¹²³Cs, populated via the ¹⁰⁰Mo ( ²⁸Si, p4n) fusion-evaporation reaction at E _lab = 130 MeV, have been investigated employing in-beam γ-ray spectroscopic techniques. Rotational bands, built on πg _7/2, πg _9/2 and the unique-parity πh _11/2 orbitals, have been extended and evolve into bands involving rotationally aligned ν(h _11/2)² and π(h _11/2)² quasiparticles. A three-quasiparticle band based on the high-K πh _11/2 ⊗ νg _7/2 ⊗ νh _11/2 configuration has also been observed. Total Routhian Surface (TRS) calculations have been used to predict the nuclear shape parameters ( β₂, β₄, γ) for the various assigned configurations. The assigned configurations have been discussed in the framework of a microscopic theory based on the deformed Hartree-Fock (HF) and angular-momentum projection techniques.