For experimental purposes an external meson beam of as low as 31±2.5 Mev kinetic energy has been obtained from the Nevis 385-Mev cyclotron by the use of a steel magnetic shield between the vacuum chamber and the concrete shielding. This has been achieved with comparatively little loss of intensity over that obtained at 63-Mev mean energy of mesons obtained through the same hole in the concrete shield without the use of the magnetic shielding.
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Koppel et al. (1957) studied this question.