Light fission-fragment mass distribution from the reaction Cf-251(n(th),f)

摘要

For mass numbers A = 80 to 124 the recoil mass spectrometer LOHENGRIN of the Institute Laue-Langevin in Grenoble was used to measure with high resolution the light fi ssion- fragment mass yields and kinetic energy distributions from thermal-neutron induced fission of Cf-252* for the first time, using Cf-251 as target material. The obtained mean light fragment mass < A(L)> = (107 +/- 2) and the corresponding mean kinetic energy < E-k,E-L > = (103 +/- 2) MeV are within the expected trend. Emission yields around A = 115 are enhanced and the corresponding mean kinetic energy is higher compared to spontaneous fission of Cf-252. This could be explained by the existence of an additional super-deformed fission mode. (c) 2007 Elsevier B.V. All rights reserved.