INDC(IND)-35G - IAEA Nuclear Data Services

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I. NUCLEAR FISSION
MASS. ENERGY CORRELATIONS IN 4 He INDUCED FISSION OP 258 U
AT MEDIUM ENERGIES
R.K. CHOUDHURY, AIOK SAXENA, S.S. KAPOOR, D.M. HADKARNI,
V.S. RAHAMURTHY and P.P.SINGH
Bhabha Atonic Research Centre
Trombay, Bombay 400083.
The energy and mass distribution of fission fragments
ill the fission of 238JJ induced by alphc. particles of
boabarding energies of 32,40,43,56 MeY, were studied. The
measurements were done by using two surface barrier detectors
in the back-to-back geometry and the coincident pulse
height information for each fission event was recorded on a
aagnetic tape. The pulse height data were analyzed off
line to obtain aass distributions and total kinetic energy
distributions. The variation in the peak to valley ratio
of the mass distribution was studied with increasing
boabarding energy. The detailed correlations between
the fragment mass (MJJ) and the total kinetic energy (
were obtained* The width of the mass distribution,
( © Kg) is found to decrease with increasing kinetic
energy whereas, IL remains almost constant upto most
probable kinetic energy of 174 MeY and then it decreases
with E K. t The Implications of these results on the
excitation energy dependence of the fission process will
be discussed. Also from the present data the possibility
of deducing, the first chance mass distribution at these
energies will be discussed*