Eur. Phys. J. A (2015) 51: 47
https://doi.org/10.1140/epja/i2015-15047-6

Regular Article - Theoretical Physics

Nuclear structure of ^122-134Ba in IBM-1

Ramjas College, University of Delhi, 110007, Delhi, India

^* e-mail: jbgupta2011@gmail.com

Received: 26 January 2015
Revised: 21 March 2015
Accepted: 2 April 2015
Published online: 27 April 2015

Abstract

The nuclear level structures of ^122-134 Ba isotopes have been studied empirically in relation to the analytic symmetries of the interacting boson model IBM-1 and in the calculation of the IBM-1 Hamiltonian. Comparison is made with experiment and with the microscopic dynamic pairing plus quadrupole model predictions available from our previous studies. The variation of the structure of states in the 2₂ ⁺ bands and of the 0 _2,3 ⁺ bands, with neutron number N, have been studied. Relation of odd-even spin staggering in the 2₂ ⁺ bands with the β-softness is illustrated. A comparison is made with predictions of the various analytical symmetries.