Abstract

The energies and opening angles for neutron-proton, and neutron-deuteron pairs emitted after π − capture in 4He have been measured. The data are compared to available theoretical calculations. Both energetic protons and deuterons are strongly correlated in direction with an energetic neutron, being emitted at approximately 180° to each other. A strong enhancement at the high-energy end of the deuteron spectrum is attributed to a strong final state interaction between the remaining two neutrons.

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