Decay of 136Pr and the Level Structure of 136Ce
Abstract
A new isotope with a 13.1 +/- 0.1-min half-life has been assigned to 136Pr. It has been produced by the reactions 136Ce(p,n)136Pr and 136Ce(d,2n)136Pr. It decays by electron capture and positron emission to excited states in 136Ce. It has a capture-to-positron ratio of 0.65 +/- 0.01 and a total decay energy of 5120 +/- 70 keV. The energies and intensities of 63 γ rays have been measured. Conversion coefficients of the 540- and the 552-keV transitions have been found to be 6.5 × 10-3, respectively. γ-γ coincidences have been measured using two 40-cm3 Ge(Li) detectors from which an energy-level diagram for 136Ce has been deduced. Spin and parity assignments have been made to many of the levels. The low-lying energy levels have been separated into quasi-ground and quasi-γ bands.
- Publication:
-
Physical Review C
- Pub Date:
- October 1971
- DOI:
- 10.1103/PhysRevC.4.1431
- Bibcode:
- 1971PhRvC...4.1431K