Measurement of the neutron-neutron scattering lengthannwith the reactionπ−d→nnγin complete kinematics
Physical Review C1987Vol. 35(6), pp. 2252–2257
Citations Over TimeTop 10% of 1987 papers
O. Schöri, B. Gabioud, C. Joseph, J.-P. Perroud, D. Rüegger, M. T. Trân, P. Truöl, E. Winkelmann, W. Dahme
Abstract
The neutron-neutron scattering length ${a}_{\mathrm{nn}}$ is determined from the low energy part of the neutron spectrum of the reaction ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$d\ensuremath{\rightarrow}nn\ensuremath{\gamma} with pions at rest. Since neutrons are detected in coincidence with the photon, the kinematics is completely determined. We obtain ${a}_{\mathrm{nn}=\mathrm{\ensuremath{-}}18.7\ifmmode\pm\else\textpm\fi{}0.6}$ fm, in agreement with a result of a previous experiment based on the analysis the photon spectrum.
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