Study of the nd-breakup reaction in the kinematical region of the nn final-state interaction

The neutron neutron (nn) final-state interaction has been studied in the n + d → p + n + n reaction at 40 ± 5 MeV. Data on the dependence of reaction yield on the relative energy of two neutrons emitted in a narrow cone of angles are obtained. The value of the nn-scattering length deduced from a comparison of the shape of FSI peak with simulation data is a _nn = −17.9 ± 1.0 fm, where the error indicates the statistical uncertainty. Original Russian Text ? S.V. Zuyev, E.S. Konobeevski, M.V. Mordovskoy, S.I. Potashev, 2009, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2009, Vol. 73, No. 6, pp. 843–845.