Investigation of the K p Ä 8 À isomer in 132

The decay of the K58 isomer in Ce with an excitation energy of 2340.2 keV has been investigated using the Sn(O,4n)Ce reaction. A half-life of 9.460.3 ms was determined. Two new decay paths have been found in the deexcitation of this isomer. The hindrance factors for the E1, M2, and E3 transitions deexciting the isomer have been determined. The decay properties of the 8 isomers in the N574 isotones are discussed. A band mixing mechanism involving the ground state and s band seems to be responsible for the behavior of the reduced hindrance factors of the E1 transitions deexciting the K58 isomers in these isotones. A K mixing, characteristic of the axially asymmetric nuclei, may account for the reduced hindrance factors of the E3 transitions to the 5g 1 states in Ba and Ce.