Search for isomeric transitions in fission products around mass number 150Y. Kojima1, M. Shibata2, A. Taniguchi3, A. Murataka1, K. Ota1 and K. Shizuma1
1 Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
2 Radioisotope Research Center, Nagoya University, Nagoya 464-8602, Japan
3 Research Reactor Institute, Kyoto University, Kumatori 590-0494, Japan
Published online: 21 May 2008
A β-gated γ-ray and internal conversion electron measurement system for identifying isomers has been installed to the isotope separator on-line at the Kyoto University Research Reactor. On-line measurements for mass number A = 93 nuclides clearly showed that it had sufficient ability to distinguish isomeric transitions from those following β-decay. Using this equipment, an isomeric state in 148Pr was successfully observed at 76.8 keV, and one in 151Pr at 35.1 keV. We also found a candidate of an isomeric transition in an A =150 nuclide produced by the thermal neutron-induced fission of 235U.
© CEA 2008