Abstract
The decay of 12.9 d 136Cs was studied with a delayed coincidence circuit. It was found that the 2211 keV (6 +) state in 136Ba is delayed with respect to the 342 keV beta rays with a half-life of T 1 2 = 3.3±0.3 nsec , and the half-life of the 2144 keV (5 −) state is smaller than about 1 nsec. Gamma rays and conversion electrons were measured with Ge(Li) and Si(Li) detectors to obtain gamma-ray intensities and conversion coefficients of some of the transitions. Transition probabilities of the four transitions de-exciting the 2211 keV state are deduced as follows: 0.45 (340 keV, E2), 4.8 (153 keV, E2), 2.2 × 10 −6 (176 keV, E1) and 2.7 × 10 −5 (67 keV, E1) in Weisskopf units. The excited states in 136Ba are discussed in terms of two-particle excitations on the basis of data thus far obtained in the decay of 136Cs.
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