Notes from the bartol research foundation

✍ Scribed by L.H. Rumbaugh; R.B. Roberts; L.R. Hafstad

• Publisher: Elsevier Science
• Year: 1939
• Tongue: English
• Weight: 46 KB
• Volume: 228
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(39)90535-1

✦ Synopsis

Yield curves have been obtained for eight of the more important reactions of Li G and Li 7 produced by proton and deuteron bombardment in the energy range from 200 to IOOO key. Each curve was obtained with an accuracy of about five per cent., and a set of intercomparisons served to determine the relative yields between the different reactions within 20 per cent. A special set of observations on a single reaction then gave the absolute yield for all the reactions within a factor of about three. An investigation was made of the reactions involved in the formation and decay of Li s, the mass of which was found to be 8.02499 :~ o.ooo2o. The range-distribution of the delayed alpha-particles from Li s was measured and the interpretation of this distribution is discussed. Observations on the reaction Li 6 + n --+ He 4 -~-H 3 gave a value of 4-97 Mev. for the reaction energy as compared to a value of 4.56 Mev. derived from the masses involved. No evidence could be obtained for the production of Li s by the process Li 7 + n --~ Li s. Measurements of the energies of the neutrons produced by deuteron bombardment of Li 6 indicated that Be 7 is formed by the reaction Li6+ D2--+ BeT+ n. Further experiments showed that Be 7 is radioactive and is converted t.o LP by K-electron capture. It was found that this process is followed by gamma-ray emission in roughly ten per cent. of the transitions.