Spins und γ-Multipolordnungen beim Zerfall Fe59→Co59

In the decay of Fe59 the following quantities have been measured:γ-ray intensities, conversion coefficients andβ-(circularly polarizedγ) correlations. The conversion coefficients were found to be: for the 1.10 MeVγ-transition, αtot.=(1.36±0.10)·10−4 and for the 1.29 MeVγ-transition, αtot.=(1.07±0.08)·10−4. The asymmetry parameterA of the correlationβ(0.27 MeV)−γ(1.29 MeV) were measured to beA= −0.17±0.10, and forβ(0.46 MeV)−γ(1.10 MeV),A=−0.13±0.04. From these data and publishedγ−γ angular correlation measurements the following spins of Co59 levels could be deduced: 1.10 MeV,I=5/2−; 1.29 MeV,I=5/2−; and 1.43 MeV,I=3/2−. The two strongβ-ray groups are pure Gamow-Teller transitions (ΔI=1). The multipolarities of all fiveγ-rays are given.