L2G o
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UCRL-3087
combination oi 1ission-yield distr:butions would tend to produce a slowly
Varying curve in this region.
The products in apparent complementary
positions with respect to the observed distribution are not necessarily
complementary fragments ol every individual tission process.
served yields of these products are nearly the same;
discrepancies are smali and tend to be averaged out.
The ob-
therefore,
any
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Those nuclides on the light-mass wing ot the distribution (A $ 75)
are seen sn aporeciebie yield only in high-energy-:induced fission,
particular,
otha
and
in
Ni Po, which are not seen in thermal-neutron or
low-energy charyed-narticle induced iission.
At 340-Mev protons, the
cross sections o: masses 66 and los ace equal.
ing nucleus giving rise to A = 66
Thesetore, the tission-
rust have had enough excitation energy
to lose iany nucleons either before or aiter scission.
The sum ot the
figsion-tragr.ent masses must be not greater than 221, and propaodly at
least two mass units less.
On the other hand,
in luw-enesgy fission,
those nuclides on the heavy-n.ass wing are seen
The fission yield of Eu! 6 varies but slightly
(from: 0.06 to 0.994.) over the entire energy range of charged particles
used.
The slopes of ail tission-preduct distributions in the region A 2150
(Figs.
1 and 2) are very nearly :dentical at all charged-particle energies
used in this work,
IV.
ACKNOWLEDGMENTS
We wish to thank Mrs. Nancy Lee and Mrs. Joyce Gross for technical
assistance;
Mr. J. T. Vale and the crew of the 184-inch cyclotron, and
the late Mr. G. B. Kossi and the crew of the 60-:nch cyclotron ‘or their
cooperation in maxing the bombardments possibie.
{men
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