MAGNETIC MOMENT OF FIRST EXCITED STATE IN 83KR BY MOSSBAUER EFFECT

The magnetic moment of the 9.3-keV first excited state in Kr83 has been measured by use of the Mössbauer effect. Source and absorber were solid krypton at 4.2°K with the absorber in a longitudinal magnetic field of 77.8 kOe from a superconducting solenoid. The ratio R of the g factor of the 72+ excited state to that of the 92+ ground state is found to be +1.249±0.002, from which μ(72+)=-(0.939±0.002)μN without diamagnetic correction. If the ground state could be considered a pure configuration of three g2 neutron holes coupling to J=92 and the excited state a recoupling within the same configuration, then R=1. Furthermore, the M1 transition matrix element would vanish. The transition is indeed retarded. It appears from the work of Noya, Arima, and Horie that a modest admixture into each state of the configuration obtained by promoting one g92 neutron to g72 can in the main account for both the observed transition rate and the excess in R. © 1969 The American Physical Society.