"Nuclear Structure and double Beta –decay in the mass region around A≈130 Interacting Boson-Fermion Model"

Abstract

Theoretical calculations using the Interacting Boson-Fermion Approximation (IBFA-1) of the structure of 183,185,187W ,123,125,127,129,131Te,125,127,129,131Xe and 123,125I were made. For 183,185,187W the fermion is coupled to the system of bosons is taken to be in the negative parity 2f7/2,2f5/2,3p3/2,3p1/2 and in the positive parity 1i13/2 single-particle orbits, where for 123,125,127,129,131Te,125,127,129,131Xe and 123,125I the fermion that is coupled to the system of bosons is taken to be in the negative parity 3s1/2,2d3/2,2d5/2,1g7/2 and in the positive parity 1i11/2 single-particle orbits, The calculated energies of low-spin energy levels of the odd isotopes are found to agree well with the experimental data. Also B(E2), B(M1) values and spectroscopic factors for single-neutron transfer are calculated and compared with experimental data.We wish to point out that, while our calculation with IBFM is standard, studies of this type are important to push the model towards applications to problems related to beta and double-beta decay.