Radioactivity of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Co</mi></mrow><mrow><mn>57</mn></mrow></msup></mrow></math></span>

Bernd Crasemann; D. L. Manley

doi:10.1103/PhysRev.98.66

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Radioactivity of ${Co}^{57}$

Bernd Crasemann and D. L. Manley^*

Department of Physics, University of Oregon, Eugene, Oregon

^*Present address: Department of Radiological Physics, University of Rochester, Rochester, New York.

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Phys. Rev. 98, 66 – Published 1 April, 1955

DOI: https://doi.org/10.1103/PhysRev.98.66

Abstract

${Co}^{57}$ (270-day) has been prepared by the reactions ${Mn}^{55} (α, 2 n)$ and ${Ni}^{58} (p, 2 p)$ , separated chemically, and its disintegration studied with a magnetic lens and a scintillation spectrometer. ${Co}^{57}$ decays by electron capture; an upper limit of 2× $10^{- 5}$ positron per disintegration has been set. Positron groups previously assigned to ${Co}^{57}$ presumably belong to one of the neighboring isotopes of cobalt. Gamma rays of 0.137 and 0.123 Mev have a relative abundance of 7 and 93 percent, and presumably are $E 2$ and $M 1$ transitions, respectively. A decay scheme is outlined.

References (19)

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B. Crasemann and D. L. Manley at the Berkeley Meeting of the American Physical Society, December, 1954 [Bull. Am. Phys. Soc. 27, No. 8, 31 (1954)]
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Omitted endnote
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[c1] J. J. Livingood and G. T. Seaborg, Phys. Rev. 60, 913 (1941)

[c2] E. H. Plesset, Phys. Rev. 62, 181 (1942)

[c3] L. G. Elliot and M. Deutsch, Phys. Rev. 64, 321 (1943)

[c4] D. E. Alburger and M. A. Grace, Proc. Phys. Soc. (London) A67, 280 (1954)

[c5] M. Deutsch and W. E. Wright, Phys. Rev. 77, 139 (1950)

[c6] Cheng, Dick, and Kurbatov, Phys. Rev. 88, 887 (1952)

[c7] K. Siegbahn, Phil. Mag. 37, 163 (1946)

[c8] D. Saxon, Phys. Rev. 81, 639 (1951)

[c9] Muller, Hoyt, Klein, and DuMond, Phys. Rev. 88, 775 (1952)

[c10] Cork, Rutledge, Stoddard, Branyan, and LeBlanc, Phys. Rev. 79, 938 (1950)

[c11] Way, Fano, Scott, and Thew, Nuclear Data, National Bureau of Standards Circular 499 (U. S. Government Printing Office, Washington, D. C., 1950)

[c12] B. Crasemann and D. L. Manley at the Berkeley Meeting of the American Physical Society, December, 1954 [Bull. Am. Phys. Soc. 27, No. 8, 31 (1954)]

[c13] E. Feenberg and G. Trigg, Revs. Modern Phys. 22, 399 (1950)

[c14] P. F. A. Klinkenberg, Revs. Modern Phys. 24, 63 (1952)

[c15] Baker, Bleaney, Bowers, Shaw, and Trenam, Proc. Phys. Soc. (London) A66, 305 (1953)

[c16] Omitted endnote

[c17] C. F. Black, Phys. Rev. 90, 381(A) (1953)

[c18] N. P. Heydenburg and G. M. Temmer, Phys. Rev. 95, 629(A) (1954) 93, 351 (1954) 96, 426 (1954)

[c19] M. Goldhaber and A. W. Sunyar, Phys. Rev. 83, 906 (1951)

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Radioactivity of Co57

Abstract

References (19)

Radioactivity of ${Co}^{57}$