Measurement of the g-factors of two levels of ¹³¹I

Abstract

The g-factors of the 150 keV first excited state and a state at 1797 keV of ¹³¹I have been measured from the rotation ωτ of the angular correlation pattern in an external magnetic field. The intergral method was used and coincidence counting rates at 135° were recorded for two directions of the field. The gamma-ray cascades involved are 452–150 keV n the case of the 150 keV state and 102–200 keV for the 1797 keV state. The results are:

$$\text{ωτ=0.097±0.012}\text{for a magnetic field of 13.2 kG}$$

$$\text{and}\text{g=1.11±0.20}\text{for the 150 keV state}\text{,}$$

$$\text{G}{}_2\text{ωτ=0.073±0.016}\text{for a magnetic field of 12.8 kG}$$

$$\text{and}\text{g=0.16±0.05}\text{for the 1797 keV state}\text{,}$$

In the latter measurement the attenuation coefficient due to time-dependent perturbations was seen to be G₂ = 0.9±0.1 by studying the anisotropy as a function of time by delayed coincidence technique.