Disintegration ofCs138

Abstract

The decay of the fission product ${\mathrm{Cs}}^{138}$ (32.1 minutes) has been studied with beta- and gamma-scintillation spectrometers and a 141-gauss, 180° permanent-magnet spectrograph. Twelve gamma rays were found with energies of 0.1389, 0.1931, 0.2289, 0.4106, 0.4626, 0.550, 0.87, 1.010, 1.426, 2.21, 2.63, and 3.34 Mev. On the basis of coincidence measurements, intensity data, internal-conversion coefficients, angular correlation data, and the above gamma energies, a consistent decay scheme is proposed which involves levels in ${\mathrm{Ba}}^{138}$ at 1.426, 1.89, 2.21, 2.30, 2.44, 2.63, and 3.34 Mev.