Experimental Survey of Nuclear Transformations Caused by 2-Mev Lithium Ions

E. Norbeck, Jr. and C. S. Littlejohn
Phys. Rev. 108, 754 – Published 1 November 1957
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Abstract

Ion beams of Li7 or Li6, between 1 and 2 Mev in kinetic energy, produced in a Van de Graaff accelerator were used to bombard targets containing light elements and some of the induced nuclear reaction products were detected. Detection was by observation of the induced radioactivity, or by counting charged particles, or by activation of copper by means of the fast neutrons produced. Existence of the following reactions was demonstrated: Yield vs bombarding-energy curves were obtained for the Li-Li reactions and the Be9 reaction producing Li8. Resonances in the yield were not observed. Some of the reactions are capable of producing neutrons of 20-Mev energy; the existence of neutrons above 11 Mev was demonstrated by initiating the reaction Cu63(n, 2n)Cu62, which requires this energy.

A search for the production of N13 from the reaction B10(Li7, H4)N13 through the range of bombarding energy indicated by the mass range through which H4 would be stable against heavy-particle breakup gave a null result, indicating that H4 is unstable.

Estimates for the yield at 2-Mev bombarding energy were made for all reactions except that leading to F17.

  • Received 17 July 1957

DOI:https://doi.org/10.1103/PhysRev.108.754

©1957 American Physical Society

Authors & Affiliations

E. Norbeck, Jr.* and C. S. Littlejohn

  • Enrico Fermi Institute for Nuclear Studies, University of Chicago, Chicago, Illinois

  • *Present address: University of Minnesota, Minneapolis, Minnesota.

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Vol. 108, Iss. 3 — November 1957

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