Study of the Gamma-Ray and Inner Bremsstrahlung Transitions in the Decay of Tin-113

Abstract

A fast-slow coincidence spectrometer was used to study the decay of ${\mathrm{Sn}}^{113}$. A 650-kev gamma ray found in the single-channel spectrum was shown to be in coincidence with the $\mathrm{In}K$ x ray both in the fast and in the slow coincidence spectra. This confirmed the existence of a 650-kev level in ${\mathrm{In}}^{113}$ fed by a weak orbital capture branching. From the relative intensities of the 257-kev gamma rays and the 650-kev gamma rays (16.4±1.9:1), it was determined that the spin of the 650-kev level is $\frac{5}{2}$ and the parity is odd. The absence of positrons and arguments from $log\mathrm{}\left(\mathrm{ft}\right)\mathrm{}$ classifications indicate a spin of $\frac{3}{2}$ and even parity for the ground level of ${\mathrm{Sn}}^{113}$ and a decay energy in the range of 0.8 to 1.6 Mev. The shape of the corrected inner brems-strahlung spectrum indicated a decay energy of 1.3±0.3 Mev.