Note on the Decay ofSb122m

Abstract

Recent information has helped remove contradictions in the assigned properties of the isomeric transition in ${\mathrm{Sb}}^{122}$. The association of a 530-μsec half-life with the second excited state in ${\mathrm{Sb}}^{122}$ is confirmed and yields an $E2\mathrm{}$ transition which is delayed by a factor of ∼420. A newly reported third transition in ${\mathrm{Sb}}^{122m}$ is confirmed and shown to precede the 530-μsec state. The energy of this transition was measured and found to be 26±1 keV. The decay scheme and the hindered transitions are discussed and compared with theory.