Quasideuteron states with deformed core

Abstract The M1 transitions between low-lying T =1 and T =0 states in deformed odd–odd N = Z nuclei are analyzed in the frames of the rotor-plus-particle model. Using the representation of an explicit coupling of angular momenta we show that strong coupling of the quasideuteron configurations to the axially deformed core results in a distribution of the total 0 + →1 + strength among a few low-lying 1 + states. Simple analytical formulae for B(M1) values are derived. The realization of the M1 sum rule for the low-lying 1 + , T =0 states is indicated. The calculated B(M1) values are found to be in good agreement with experimental data and reveal specific features of collectivity in odd–odd N = Z nuclei.