Shell model structures in the N=46 isotones Zr-86, Nb-87, Mo-88, Tc-89, Ru-90 and Rh-91

The known level energies, electromagnetic moments and decay probabilities o f high-spin states in the N = 46 isotones Zr-86, Nb-87, Mo-88, Tc-89, and R u-90 are interpreted within the shell model. The single-particle spare was truncated to the p(1/2) and g(9/2) orbits (relative to the Sr-88 core) and the single-particle energies and empirical two-body matrix elements derived Gross and Frenkel were used in the calculations. Based on the generally go od success of this approach, energies and decay properties of the yrast spe ctra in Ru-90 and Rh-91 are predicted.