Modelling of the 9Be(n, 2n) double-differential cross section

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Abstract

A detailed and exact representation is presented of the multistage sequential and 3-body breakup channels of the 9Be(n, 2n) reaction. The analysis is used to construct the double-differential cross section for this reaction which is then compared with the measurements of Drake et al. (1977) using appropriate data from the evaluation of Perkins et al. (1985). At an incident energy of 14.1 MeV, good agreement is obtained with the measurements; at 10.1 MeV reasonable agreement is obtained, but poor agreement is found with the measurements at 5.9 MeV. However, by assuming isotropic centre of mass distributions at each of the reaction stages and zero contribution from 3-body break up, good agreement can be obtained with the 5.9 MeV measurements. Tentative conclusions point to an over emphasis in the existing evaluation of the importance of the 9.94 MeV and 4.704-MeV levels in 9Be and to an overestimate of the 3-body breakup contribution.

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