Abstract
The nn final state interaction has been investigated in \(d+{{}^{2}}\hbox {H}\rightarrow (pp)^{S}+(nn)^{S}\rightarrow p+p+n+n\) reaction going through a formation and breakup of singlet diproton and dineutron in the intermediate state. In the kinematically complete experiment performed at \(E_{d}=15\) MeV two protons and neutron were detected at angles close to those of emission of \((\textit{pp})^{S}\) and \((\textit{nn})^{S}\) systems. Simulation of the reaction showed that the shape of neutron energy (timing) spectrum depends on \(E_{nn}\)—the energy of virtual \(^{1}S_{0}\) state of nn-system. The most likely value \(E_{nn}=0.076\pm 0.006\) MeV was obtained by fitting procedure using the experimental data and simulations. This low value of \(E_{nn}\) evidently indicates on effective enhancement of nn-interaction in intermediate state of the studied reaction.
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This article belongs to the Topical Collection “The 23rd European Conference on Few-Body Problems in Physics”.
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Konobeevski, E., Kasparov, A., Mordovskoy, M. et al. Determination of Energy of n n-Singlet Virtual State in \(\varvec{d+{{}^{2}}}\hbox {H}\varvec{\rightarrow p+p+n+n}\) Reaction. Few-Body Syst 58, 107 (2017). https://doi.org/10.1007/s00601-017-1272-8
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DOI: https://doi.org/10.1007/s00601-017-1272-8