Nuclear fission of neutron-deficient protactinium nuclides
- Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki 319-11 (Japan)
- Faculty of Science, Tokyo Metropolitan University, Minami-Ohsawa, Hachioji, Tokyo 192-03 (Japan)
- School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113 (Japan)
- Laboratory of Nuclear Science, Tohoku University, Mikamine, Taihaku-ku, Sendai 982 (Japan)
Fragment velocity, kinetic energy, mass yield, and element yield distributions in the fission of neutron-deficient Pa isotopes produced in the reactions of {sup 16}O and {sup 18}O on {sup 209}Bi have been measured at incident beam energies near and above the Coulomb barriers by the time-of-flight and radiochemical methods. An asymmetric mass-division component has been observed. Measured fission cross sections were compared with the results of statistical model calculations which take into account two fission barrier heights for symmetric and asymmetric yields. The fission barrier height deduced for the asymmetric fission is found slightly lower than that for the symmetric one. The difference between the two barrier heights in the fission of the present protactinium nuclides (N{approximately}135) is considerably smaller than that in the neutron-rich nuclide of {sup 233}Pa (N{approximately}142), indicating that the difference sensitively depends on the neutron number of the fissioning nuclide. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 528171
- Journal Information:
- Physical Review, C, Vol. 56, Issue 2; Other Information: PBD: Aug 1997
- Country of Publication:
- United States
- Language:
- English
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