title: New attempt to determine the n-n scattering length with the 2H(n, np)n reaction
abstract: The n-n final-state interaction (FSI) was investigated via the 2H(n, np)n reaction at 25 MeV, using a geometry which enables the simultaneous observation of n-p quasifree (QFS) scattering. The data were analyzed with Monte Carlo simulations based on rigorous Faddeev calculations with realistic nucleon-nucleon potentials. The value of a(nn) deduced from the absolute yield in the FSI peak is -16.27+/-0. 40 fm while the relative data, normalized in the QFS region, give -16.06+/-0.35 fm. Thus our results differ from the "recommended" value of a(nn) = -18.5+/-0.3 fm by more than 5 standard deviations.
authors.affiliation: Institut fur Strahlen- und Kernphysik, Universitat Bonn, D-53115 Bonn, Germany.
authors.initials: V
authors.lastname: Huhn
authors.initials: L
authors.lastname: Watzold
authors.initials: C
authors.lastname: Weber
authors.initials: A
authors.lastname: Siepe
authors.lastname: von Witsch W
authors.initials: H
authors.lastname: Witala
authors.initials: W
authors.lastname: Glockle