Variation of total kinetic energy and mass distributions in the fusion-fission reaction of $^{16}O, {}^{19}F + {}^{209}Bi$ at near barrier energies

L.M. Pant; R.K. Choudhury; A. Saxena; D.C. Biswas

doi:doi:10.1007/s100500170095

EPJ

Variation of total kinetic energy and mass distributions in the fusion-fission reaction of ¹⁶O, ¹⁹F + ²⁰⁹Bi at near barrier energies

L.M. Pant, R.K. Choudhury, A. Saxena and D.C. Biswas

lmpant@apsara.barc.ernet.in

(Received: 9 April 2001 / Revised version: 10 May 2001 Communicated by D. Guerreau)

Abstract
Fission fragment mass and energy distributions and their correlations have been measured for the ¹⁶O and ¹⁹F + ²⁰⁹Bi reactions over a wide range of excitation energies ( E^*=30-50 MeV). It is observed that in the case of ¹⁶O + ²⁰⁹Bi reaction, the average total fragment kinetic energy, $\langle TKE\rangle$ is nearly independent of the bombarding energy. However, in the case of ¹⁹F + ²⁰⁹Bi reaction, the average total kinetic energy of the fission fragments shows a peaking behaviour near the barrier. The variation in $\langle TKE\rangle$ at near barrier energies in the ¹⁹F + ²⁰⁹Bi system seems to be correlated with corresponding strong variation in the variance of the fragment mass distribution. The present results may imply certain dynamical effects leading to compact scission configurations in the fission of ¹⁹F + ²⁰⁹Bi system at near barrier bombarding energies.

PACS

Società Italiana di Fisica, Springer-Verlag 2001