Anomalous conversion of 127 keV (E3) transition in134Cs

Abstract

The total conversion coefficient of the 127.49 keV E3 isomeric transition in the decay of 134mCs was measured using the gamma intensity balance method with the help of a high resolution low energy photon detector. The er value was found to be 5.84_+0.47 as against the theoretical value of 6.96, thus showing an anomaly of (16.1 +6.7)%. The K-conversion coefficient, ~ was also measured using the X-ray peak to gamma ray intensity method and found to be 2.24+0.04 as against the theoretical value of 2.72, which shows an anomaly of (17.6_+ 1.4)% consistent with the experimental anomaly in at-The E 3 hindrance factor of the isomeric transition was estimated to be (3.44 _+ 0.23) 9 10 4.