Internal Bremsstrahlung and Decay Scheme ofSb119

Abstract

The spectrum and yield of internal bremsstrahlung accompanying electron capture form $S$ and $P$ states in ${\mathrm{Sb}}^{119}$ were measured and compared with the theory of Glauber and Martin. ${\mathrm{Sb}}^{119}$ was obtained as the daughter from ${\mathrm{Te}}^{119}$ produced by the $\mathrm{Sb}(d, xn){\mathrm{Te}}^{119}$ and $\mathrm{Sn}(\alpha , xn){\mathrm{Te}}^{119}$ reactions. The decay is by orbital electron capture to the 23.83-kev state in ${\mathrm{Sn}}^{119}$. The following results were obtained: ${\mathrm{Sb}}^{119}$ half-life, 38.0 hr; ${\mathrm{Sb}}^{119}$-${\mathrm{Sn}}^{119}$ decay energy, 579±20 kev; half-life of the 23.83-kev state and its total conversion coefficient, (1.85±0.1)×${10}^{-8\mathrm{}}$ sec and 6.3±0.4, respectively. The intensity of internal bremsstrahlung for capture from $S$ states was $(1.06\mathrm{}\pm 0.15)\times {10}^{-4\mathrm{}} \mathrm{quanta}/K$ capture. This agrees with the theoretical prediction of 0.97×${10}^{-4\mathrm{}}$. The large contribution at low energies from $P$-state capture was measured down to 70 kev and agrees with the theory in its present state of completion.