In-beam investigation of ternary fission

Abstract

Nuclear fission accompanied by long-range alpha particles has been investigated. Fission was induced by irradiating a natural uranium target with 13.5 MeV deuterons. The alpha energy and angular distributions are similar to those observed in spontaneous or thermal neutron induced fission. The correlation angle between alpha particles and light fission fragments has a most probable value of O~s_~= 82.1 ~ ~ and a dispersion (FWHM) of A 0= 18.4~ 1.2 ~ The mean value and dispersion of the energy distribution are/~= 14.8 _+ 1.0 MeV and AE = 9.1 + 1.2 MeV (FWHM), respectively. The peak-to-valley ratio of the ternary fission fragment mass distribution is found to increase with increasing alpha energy. For near-symmetric mass division, a strong broadening of the angular distribution is observed. The results are discussed in the frame of a multichannelfission model.

10.1007/s11450-008-1003-1

“…Using data associated with low-energy fission [6,8,11], we decomposed the total photofission yield at the energy of 50 MeV, Y tot = Y 1 , into individual terms representing one symmetric (Superlong) and two asymmetric (Standard I and Standard II) fission modes.…”

“…The nuclear-fission phenomenon has been studied by various methods (see, for example, [10][11][12]). The induced-activity method is one the ways to study charge and mass distributions of fission fragments with allowance for their nuclear properties.…”