Abstract
This letter demonstrates that there are some mistakes in the article of Roshan et al (Pramana – J. Phys. 90(3): 30, 2018) in dealing with the scattering of neutrons on \({\upalpha }\)-particles in three-dimensional space. In fact, there is no one-to-one correspondence between the incident neutron energy and the scattering angle of the \({\upalpha }\)-particle even if they have definite velocities before scattering. Instead, the situation is complex, and all the scattered \({\upalpha }\)-particles will emit in a cone, which is called the velocity cone. At each scattering angle, which is smaller than the apex angle of the velocity cone, there are two groups of \({\upalpha }\)-particles with different kinetic energies.
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M V Roshan, H Sadeghi, M Ghasabian and A Mazandarani, Pramana – J. Phys. 90(3): 30 (2018)
ENDF: Evaluated Nuclear Data File, https://www-nds.iaea.org/exfor/endf.htm
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Zhang, G., Zhang, X. Scattering of neutrons on \({\upalpha }\)-particles in three-dimensional space. Pramana - J Phys 93, 61 (2019). https://doi.org/10.1007/s12043-019-1824-1
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DOI: https://doi.org/10.1007/s12043-019-1824-1