From the observations of Barschall and Kanner on the scattering of 2.5-Mev neutrons in helium is deduced the existence at this energy of a coupling between the spin and orbital motion of the neutron. Less clear-cut evidence points to appreciable interaction between a neutron and alpha-particle of two units of mutual angular momentum, the classical distance of closest approach of which would be 7×{}10^-13 cm.
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Wheeler et al. (1940) studied this question.
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