Lifetimes of the 26 and 110keV levels in 56Mn

Using thermal-neutron capture on natural manganese targets, delayed coincidence lifetime measurements have been made for the 26 keV level: T 1/2 = 8.65 ± 0.50 ns, and the 110 keV level: T 1/2 = 5.08 ± 0.15 ns in 56 Mn. A systematic error in the 26 keV lifetime measurement, which arises when the 26 keV level is populated by a γ ray which has cascaded through the delayed 110 keV level, has been examined. The experimental reduced M1 and E2 …