title: Matrix elements of random operators and discrete symmetry breaking in nuclei
abstract: It is shown that several effects are responsible for deviations of the intensity distributions from the Porter-Thomas law. Among these are genuine symmetry breaking, such as isospin, the nature of the transition operator, truncation of the Hilbert space in shell model calculations, and missing transitions.
authors.affiliation: Nuclear Theory and Elementary Particle Phenomenology Group, Departamento de Fisica Nuclear, Instituto de Fisica, Universidade de Sao Paulo, C.P. 66318, 05315-970 Sao Paulo, S.P., Brazil.
authors.initials: MS
authors.lastname: Hussein
authors.initials: MP
authors.lastname: Pato