Isobaric analog resonances in the /sup 6/8Zn(p,. gamma. )/sup 6/9Ga reaction

Isobaric analog resonances in /sup 6/9Ga corresponding to the ground (1/2/sup -/) and first excited (9/2/sup +/) parent states of /sup 6/9Zn have been studied by the /sup 6/9Zn(p,..gamma..) reaction. The ..gamma.. decay of the gound state of /sup 6/9Zn is compared with the ..beta.. decay of the parent isobaric analog state. The latter is a pure Gamow-Teller transition to the ground (3/2/sup -/) and third (3/2/sup -/) excited states, while both Gamow-Teller and Fermi matrix elements can contribute in the decay to the second excited (1/2/sup -/) state of /sup 6/9Ga. The M1 decay widths obtained from the ..gamma.. decay of the J/sup ..pi../ = 1/2/sup -/ isobaric analog state are in good agreement with the widths extracted from the logft values in the first two of the three ..beta..-decay branches. However, the M1 decay width to the third excited state disagrees with the value deduced from the logft value of the ..beta.. decay of the /sup 6/9Zn g.s. to this state. In addition, the M1 transition strength of the 9/2/sup +/ (T/sub greater-than/) state to the 9/2/sup +/ (T/sub less-than/) state in /sup 6/9Ga has been measured and is compared with the recently published systematic trends for themore » analog to antianalog transition in other f-p shell nuclei.« less