Elsevier

Nuclear Physics A

Volume 241, Issue 2, 7 April 1975, Pages 317-331
Nuclear Physics A

Fission lifetimes measured by crystal blocking of fragments from 238U(n, f) reactions

https://doi.org/10.1016/0375-9474(75)90321-8Get rights and content

Abstract

The lifetime of 239U compound nuclei formed in 238U(n, f) reactions has been measured at three neutron energies, 1.7, 2.3, and 3.6 MeV, by the crystal-blocking lifetime technique. The results are τ = 300 ± 70 as (1.7 MeV), τ = 200 ± 55 as (2.3 MeV), and τ < 100 as (3.6 MeV). For the two lower energies, the axial and planar methods for lifetime extraction have been compared and the results are in reasonable agreement. The lifetimes are combined with measured values of the fission probability Pf = ΓfΓ to obtain the partial widths for fission, Γf, and for neutron emission, Γn. These are in turn compared with theoretical estimates.

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