Neutron-neutron quasifree scattering in the 2H(n, nn)p reaction at En = 14.1 MeV

Abstract

Neutron-neutron quasifree scattering has been studied in the deuteron break-up reaction 2H(n, nn)p at E n = 14.1 MeV. Two coplanar and symmetric configurations have been investigated in a kinematically complete experiment where the detection of the spectator particle was not possible. The experimental cross sections are compared with “exact” calculations derived from Faddeev-type equations solved with S- and P-wave nucleon-nucleon separable interactions. These calculations agree both in shape and magnitude with the differential cross section for the θ 1 = − θ 2 = 40° configuration ( E p min = 0). At θ 1 = − θ 2 = 30° ( E p min = 180 keV). however, the absolute value of the measured cross section is too high and an observed structure in the shape of the differential cross section is in sharp conflict with the now available “exact” calculations.