A semiempirical model describing the direct breakup of light nuclei by low-energy nucleons is proposed. The model is based upon the assumption that a statistical equilibrium is established with respect to the incident particle and (ν-1) tightly bound subgroup components of the target nucleus inside of an energy-dependent interaction volume. The interaction volume is taken to be an oblate spheroid which is oriented along the direction of the incident particle path, and which has a minor axis equal to the de Broglie wavelength λ, and a major axis equal to (R+aλ), where R and a are parameters characteristic to the particular reaction involved. The direct breakup cross section is calculated for the Be⁹(n, 2n)Be⁸ and C¹²(n, n^')3He⁴ reactions.
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Mendel Sachs (1956) studied this question.