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Threshold proton energies for neutron emission have been determined carefully for Be⁹, B¹¹, C¹³, O¹⁸, Cl³⁷, K⁴¹, V⁵¹, Mn⁵⁵. Thin target yield data up to about 4 Mev proton energy are reported for Be⁹, B¹¹, O¹⁸, and K⁴¹. A summary of all reported p-n thresholds for Z≤25 is included. Isobaric mass differences from p-n measurements and from beta-ray end points are compared. Data concerning the suitability of various p-n reactions as controlled energy neutron sources are included.
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Richards et al. (1950) studied this question.
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