Toward isovector M1 transitions in odd-odd N = Z nuclei

Isovector At I transitions between low-lying T = I and T = 0 states in odd- odd N = Z nuclei are discussed. The data on low-spin states in the odd-odd nuclei V-46 and Mn-50 investigated with the Ti-46(p, n gamma)V-46 and Cr-50 (p, n gamma)Mn-50 fusion evaporation reactions at the FN-TANDEM accelerator in Cologne are reported. A simple explanation of the enhancement of the MI transitions is given in terms of quasideuteron configurations. The fragmen tation of the strong MI transitions is shown to be due to the coupling of t he two-particle configurations to the rotating core. (C) 2001 MAIK "Natika/ Interperiodica".