Abstract
Summary The reaction 7Be (n p) 7Li has been identified for neutrons incident with thermal energies. The cross section has been measured as 5·3±0·8× 10-20 cm2. The cross section for the reaction 7Be (n α) 4He does not exceed 1 barn. The results show the parity of 7Be tobe odd. The activity of 7Be source has been diminished by neutron bombardment. The cross section for all processes leading to the destruction of 7Be is found to the 4·8±0·9× 10 20 cm2. A comparison of the 7Be (n p)7Li and 7Li(p n)7Be cross sections gives evidence for a level in 8Be near the neutron threshold of width not exceeding 30 kev.
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