A method of measuring the close to threshold meson production in neutron-neutron collisions is described where the momenta of the colliding neutrons can be determined with the accuracy obtainable for the proton-proton reaction. The technique is based on the double quasi-free nn --> nnX(0) reaction, where deuterons are used as a source of neutrons. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 40]
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