We study the fluctuation properties of ΔT=0 electromagnetic
transition intensities and electromagnetic moments in A∼60 nuclei within
the framework of the interacting shell model, using a realistic effective
interaction for
pf-shell nuclei with a 56Ni core. The distributions of the transition
intensities and of the electromagnetic moments are well described by the
Gaussian orthogonal ensemble of random matrices. In particular, the transition
intensity distributions follow a Porter-Thomas distribution. When diagonal
matrix elements (i.e., moments) are included in the analysis of transition
intensities, we find that the distributions remain Porter-Thomas except for the
isoscalar M1. The latter deviation is explained in terms of the structure of
the isoscalar M1 operator.Comment: 11 pages, 4 figure