Three New Delayed Alpha-Emitters of Low Mass

Luis W. Alvarez
Phys. Rev. 80, 519 – Published 15 November 1950
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Abstract

Two new positron active isotopes, B8 and Na20, have been found to decay to excited states of Be8 and Ne20, which in turn decay "instantaneously" by alpha-emission. Their half-lives are 0.65±0.1 sec. and ¼ sec., respectively. N12 is also found to have a low energy positron group which leads to an α-unstable excited state in C12. The masses of B8 and Na20 are 8.027 and 20.015, respectively. B8 decays by a 13.7±0.3-Mev positron, through the same excited state of Be8 as does Li8. Estimates of the energies of the excited state in C12 and Ne20 are made.

  • Received 24 July 1950

DOI:https://doi.org/10.1103/PhysRev.80.519

©1950 American Physical Society

Authors & Affiliations

Luis W. Alvarez

  • Radiation Laboratory, Department of Physics, University of California, Berkeley, California

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Issue

Vol. 80, Iss. 4 — November 1950

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