Decay ofSn11350(112 days) andIn113m49(1.73 hr)

Abstract

Samples of ${}_{50}{}^{}{}_{}{}^{}\mathrm{Sn}_{}^{113}{}_{}{}^{}$(112 days) were produced by neutron irradiation of tin enriched in ${\mathrm{Sn}}^{112}$. The gamma rays were studied by scintillation methods using the Argonne 256-channel analyzer; the internal-conversion electrons were investigated by means of a 180° $\beta$-ray spectrometer. In addition to the well-established 393-kev gamma ray, a gamma ray of 255 kev was found. Studies of all the tin radioisotopes showed the latter to be in the ${\mathrm{Sn}}^{113}$ activity. Energy levels in ${\mathrm{In}}^{113}$ at 393 and 648 kev, the latter having spin ½ or $\frac{3}{2}$, are indicated.