Elsevier

Nuclear Physics

Volume 53, April–May 1964, Pages 209-218
Nuclear Physics

Neutrons from the proton bombardment of Li6, Li7, Be9, B11 and O18

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Abstract

The total neutron yield from proton bombardment has been measured for Li6 from threshold to 14 MeV; for Li7, Be9 and B11 from 4 to 14 MeV; and for O18 from 3.5 to 10 MeV. The Li6(p, n)Be6 reaction Q value measured in this experiment is −5.05±0.05 MeV, giving a Be6 mass excess of 18.36±0.05 MeV. The neutron yield from Li7 at higher energies cannot be explained on the basis of the (p, n) reaction alone and is ascribed in part to multi-particle breakup. An anomaly in the Be9+p neutron yield curve is ascribed to a threshold for production of neutrons by a state in B9 at 4.04 MeV. The B11(p, n)C11 reaction results confirm previous level structure in C12 and a new “level” at Ep = 11.85 MeV (energy of excitation in C12 of 26.81 MeV.) The O18+p neutron yield shows 21 “resonant” peaks (energy of excitation 11.4 to 16.8 MeV).

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