Elsevier

Nuclear Physics A

Volume 403, Issue 1, 11 July 1983, Pages 189-204
Nuclear Physics A

Measurement of pre-fission neutrons from 200Pb; Further limits to the statistical fission parameters

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Abstract

The average number of pre-fission neutrons (νpre) emitted following fusion of 181Ta and 19F has been measured. The multiplicity is 2.1 ± 0.5, 2.7 ∓ 0.5 and 2.9 ∓ 0.5 at bombarding energies of 105, 115 and 125 MeV respectively. Thus, on average, fission occurs about half way down the neutron evaporation chain for 200Pb. Calculated values of νpre, from the statistical/rotating liquid drop model, are extremely sensitive to afan, the ratio of the level density parameters at the saddle point and equilibrium deformations. The results restrict the effective value of afan to 1.02 ± 0.02.

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Atomic Energy of Canada Limited Research Company, Chalk River Nuclear Laboratories, Chalk River, Ontario, Canada K0J 1J0.

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