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LWThe neutron-neutron and neutron-proton 'SO scattering lengths a , and 4rp, reepectively, were determined simultaneously from the neutron-deuteron breakup reaction. Their comparison with the recommended valuea obtained from "two-bodyw reactionti gives a measure of the importance of three-nucleon force effects in the three-nucleon continuum. In order to check on the reuult obtained for u,,,, from the "two-body" x'-d capture reaction, a new measurement was performed at LANL. Pmlimiiary results of the three experiments are given.

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