Decay of 3.5-MinI12253

Abstract

Scintillation spectrometer studies of the radiations from ${\mathrm{I}}^{122}$ have shown 564-keV (100), 686-keV (7), 780-keV (5), 1250-keV (1.1), 1420-keV (0.9), 1750-keV (complex, 2), 2180-keV (1), 2540-keV (0.2), 2740-keV, 2920-keV, 3170-keV, and 3450-keV gamma rays with the intensities given in the parenthesis. From the gamma-gamma coincidence, positron-gamma coincidence, and the summing technique, it has been inferred that the 564-, 1250-, 1350±10-, 1950±30-, 2350±50-, 2530±50-, 2750±50-, 2970±50-, 3100±50-, and 3400±50-keV levels in ${\mathrm{Te}}^{122}$ are excited in the decay of ${\mathrm{I}}^{122}$. From the gamma-gamma angular correlation studies, the 1350-keV level is assigned the spin and parity $0^{+}$. The $log\mathrm{ft}$ values of the positron decay to the ground, 564-, 1250-, 1340-keV states of ${\mathrm{Te}}^{122}$ have been estimated to be 4.6, 5.1, 6.2, and 6.2, respectively. The $log\mathrm{ft}$ value of the ${\beta }^{-}$ decay of ${\mathrm{Sb}}^{122}$ to the 1350-keV state of ${\mathrm{Te}}^{122}$ has been estimated to be ≥9.7.