ExtendedM1sum rule for excited symmetric and mixed-symmetry states in nuclei

N. A. Smirnova, N. Pietralla, A. Leviatan, J. N. Ginocchio, C. Fransen
2002 Physical Review C  
A generalized M1 sum rule for orbital magnetic dipole strength from excited symmetric states to mixed-symmetry states is considered within the proton-neutron interacting boson model of even-even nuclei. Analytic expressions for the dominant terms in the B(M1) transition rates from the first and second $2^+$ states are derived in the U(5) and SO(6) dynamic symmetry limits of the model, and the applicability of a sum rule approach is examined at and in-between these limits. Lastly, the sum rule
more » ... tly, the sum rule is applied to the new data on mixed-symmetry states of 94Mo and a quadrupole d-boson ratio $nd(0^+_1)/nd(2^+_2) \approx 0.6$ is obtained in a largely parameter-independent way
doi:10.1103/physrevc.65.024319 fatcat:xk3t3x5cjndqraasmaxympiqpi