Fragment mass dependence of angular anisotropy in 15 MeV proton-induced fission of
Pu
K. Tsukada1 - I. Nishinaka1 - N. Shinohara1 - S. Ichikawa1 - Y. Nagame1 - K. Sueki2 - H. Nakahara2 - T. Ohtsuki3 - M. Tanikawa4
1 Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195, Japan
(e-mail: ktsuka@popsvr.tokai.jaeri.go.jp,
Fax: +81-29-282-6097)
2 Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0364, Japan
3 Laboratory of Nuclear Science, Tohoku University, Taihaku-ku, Sendai 982-0826, Japan
4 Department of Chemistry, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
Abstract
Angular distributions of fission fragments with mass number A=97-159 have been
measured by the radiochemical recoil-catcher method in the proton-induced fission of
244Pu with the incident energy of 15 MeV. Angular anisotropies of extreme asymmetric
mass division products even up to the fragment mass ratio of 
1.85 are found not any different from those of the typical asymmetric mass division products
with 
138, which indicates that no clear evidence is observed for the existence
of an additional saddle point configuration in the extreme asymmetric mass division. The
correlation between the saddle point state evaluated from the angular anisotropy and the
mass division mode is discussed.
PACS
25.85.-w Fission reactions -
25.85.Ge Charged-particle-induced fission
Copyright Springer-Verlag
