Nitrogen 12

Luis W. Alvarez

doi:10.1103/PhysRev.75.1815

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Nitrogen 12

Luis W. Alvarez

Radiation Laboratory, University of California, Berkeley, California

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Phys. Rev. 75, 1815 – Published 15 June, 1949

DOI: https://doi.org/10.1103/PhysRev.75.1815

Abstract

$N^{12}$ is shown to have a half-life of 12.5±1 milliseconds, and a positron upper limit of 16.6±0.2 Mev. It is produced by the reaction $C^{12} (p, n) N^{12}$ , and has a threshold proton energy of 20.0 Mev. This indicates that $N^{12}$ is within about 200 kev of being unstable against proton emission. The mass of $N^{12}$ is 12.0228±0.00015, and the beta-transition is allowed.

References (8)

W. H. Barkas, Phys. Rev. 55, 691 (1939)
R. Sherr, H. R. Muether, and M. G. White, Phys. Rev. 74, 1239A (1948) and 75, 282 (1949)
W. W. Chupp and E. M. McMillan, Phys. Rev. 72, 873 (1947) E. M. McMillan and R. D. Miller, 73, 80 (1948) W. K. H. Panofsky and R. Phillips, 74, 1732 (1948)
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L. E. Glendenin and C. D. Coryell, MDDC 19 (1946)
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W. F. Harnyak, C. B. Dougherty, and T. Lauritsen, Phys. Rev. 74, 1727 (1948)
Omitted endnote

[c1] W. H. Barkas, Phys. Rev. 55, 691 (1939)

[c2] R. Sherr, H. R. Muether, and M. G. White, Phys. Rev. 74, 1239A (1948) and 75, 282 (1949)

[c3] W. W. Chupp and E. M. McMillan, Phys. Rev. 72, 873 (1947) E. M. McMillan and R. D. Miller, 73, 80 (1948) W. K. H. Panofsky and R. Phillips, 74, 1732 (1948)

[c4] J. H. Smith, Phys. Rev. 71, 32 (1947)

[c5] L. E. Glendenin and C. D. Coryell, MDDC 19 (1946)

[c6] E. J. Konopinski, Rev. Mod. Phys. 15, 209 (1943)

[c7] W. F. Harnyak, C. B. Dougherty, and T. Lauritsen, Phys. Rev. 74, 1727 (1948)

[c8] Omitted endnote

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Nitrogen 12

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References (8)

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