Formation of ${He}^{6}$ by 14-Mev Neutron Bombardment of Li and Be

Formation of

{He}^{6}

by bombardment of

{Li}^{6}

{Li}^{7}

, and

{Be}^{9}

with 14-Mev neutrons has been observed. The

{He}^{6}

was identified by its known half-life and the decay rate observed on a ten-channel time-delay analyzer. Beta-rays from the

{He}^{6}

were detected by means of a thin-walled proportional counter, and the over-all counting efficiency was determined by using the

{Cu}^{63} (n, 2 n) {Cu}^{62}

reaction. Cross sections determined for the

{Li}^{6} (n, p)

{Li}^{7} (n, d)

, and

{Be}^{9} (n, α)

reactions were 6.7±0.8, 9.8±1.1, and 10±1 millibarns, respectively. The half-life of

{He}^{6}

was found to be 0.83±0.03 second.

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Formation ofHe6by 14-Mev Neutron Bombardment of Li and Be