Abstract
A “complete” experiment has been performed in measuring coincidences of the two neutrons from the deuteron break-up by 14.1 MeV incident neutrons. The measurements were confined to particle configurations containing only high-energy zero-angle protons. By choosing the detector angles symmetrically at ±67.5°, coincidences were recorded for equal energies of the break-up neutrons in the range of 0.2 to 3 MeV. The coincidences were separated from the background by means of a coincidence time-of-flight arrangement containing a deuterated scintillator, which represented the target. The data were analysed by means of the Monte-Carlo method using the Born approximation for the calculation of the break-up cross section. From the calculated curves, a value of −18.8 −11.9 +5.5 fm for the neutron-neutron scattering length was found to give the best agreement with the experiment.
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