Conversion electron measurement in the -decay ofY. Kojima1, M. Shibata2, A. Taniguchi3, T. Hanafusa1, E. Yoshida1, K. Shizuma1, Y. Kawase3 and S. Yamada3
1 Quantum Energy Applications, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
2 Facility for Nuclear Materials, Nagoya University, Nagoya 464-8603, Japan
3 Research Reactor Institute, Kyoto University, Kumatori 590-0494, Japan
(Received: 28 June 2002 / Revised version: 21 October 2002 / Published online: 25 February 2003)
The -decay of 151Pr produced by the thermal neutron-induced fission of 235U has been studied using an on-line isotope separator. From an internal-conversion electron measurement with a Si(Li) detector, K-conversion coefficients were obtained for 20 -transitions. Spins and parities of 6 excited levels in 151Nd were newly determined from the deduced multipolarities: even parities for the 543 and 627 keV levels, odd parities for 250 and 599 keV, (3/2, 5/2) + for 685 keV, and (1/2, 3/2) + for 880 keV. The level structure was compared with the rotation-vibration coupling Nilsson model.
21.10.Hw - Spin, parity, and isobaric spin.
23.20.Nx - Internal conversion and extranuclear effects.
27.70.+q - .
© Società Italiana di Fisica, Springer-Verlag 2003