Radioactivity in Silver Induced by Fast Neutrons

M. L. Pool

doi:10.1103/PhysRev.53.116

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Radioactivity in Silver Induced by Fast Neutrons

M. L. Pool^*

University of Michigan, Ann Arbor, Michigan

^*Now at Ohio State University.

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Phys. Rev. 53, 116 – Published 15 January, 1938

DOI: https://doi.org/10.1103/PhysRev.53.116

Abstract

Radioactive silver, ${Ag}^{112}$ , has been produced by fast neutron bombardment of ${Cd}^{112}$ and ${In}^{115}$ . A half-life period of 3.2 hours is observed with the upper limit of the electron beta-ray spectrum at 2.2 Mev. Gamma-rays are also emitted, the number per beta-ray is about four. The radioactive silver isomer, ${Ag}^{106}$ , produced by fast neutron bombardment of ${Ag}^{107}$ , has a positron beta-ray spectrum upper limit of 1.9 Mev and an electron beta-ray spectrum upper limit of 1.3 Mev. The half-life periods are respectively 24.5 min. and 8.2 days. The former emits no gamma-rays other than the annihilation radiation. The latter emits a complex gamma-ray spectrum. The number of gamma-rays per beta-ray is about 35. Nuclear $K$ electron capture is offered to explain this anomalously high gamma to beta ratio. A total of twenty nuclear reactions all leading to the production of radioactive silver have been observed.

References (19)

Pool, Cork and Thornton, Phys. Rev. 52, 380 (1937)
Fermi, Ricerca Scient. 5, 330 (1934)
Kraus and Cork, Phys. Rev. 52, 763 (1937)
Pool, Cork and Thornton, Phys. Rev. 52, 239 (1937)
Amaldi, D'Agostino, Fermi, Pontecorvo, Rasetti and Segrè, Proc. Roy. Soc. 149, 522 (1935)
Szilard and Chalmers, Nature 135, 98 (1935)
Bothe and Gentner, Zeits. f. Physik 106, 236 (1937)
Lawson and Cork, Phys. Rev. 52, 531 (1937)
Cork and Thornton, Phys. Rev. 51, 608 (1937)
Heyn, Nature 139, 842 (1937)
McMillan, Phys. Rev. 46, 868 (1934)
Bothe and Gentner, Naturwiss. 25, 126 (1937)
Kraus and Cork, Phys. Rev. 51, 382 (1937)
Reddeman and Strassmann, Naturwiss. 25, 458 (1937)
Pool, Cork and Thornton, Phys. Rev. 51, 890 (1937)
Richardson and Kurie, Phys. Rev. 50, 999 (1936)
Jacobsen, Nature 139, 879 (1937)
Alvarez, Phys. Rev. 52, 134 (1937)
Möller, Physik. Zeits. Sowjetunion 11, 9 (1937)

[c1] Pool, Cork and Thornton, Phys. Rev. 52, 380 (1937)

[c2] Fermi, Ricerca Scient. 5, 330 (1934)

[c3] Kraus and Cork, Phys. Rev. 52, 763 (1937)

[c4] Pool, Cork and Thornton, Phys. Rev. 52, 239 (1937)

[c5] Amaldi, D'Agostino, Fermi, Pontecorvo, Rasetti and Segrè, Proc. Roy. Soc. 149, 522 (1935)

[c6] Szilard and Chalmers, Nature 135, 98 (1935)

[c7] Bothe and Gentner, Zeits. f. Physik 106, 236 (1937)

[c8] Lawson and Cork, Phys. Rev. 52, 531 (1937)

[c9] Cork and Thornton, Phys. Rev. 51, 608 (1937)

[c10] Heyn, Nature 139, 842 (1937)

[c11] McMillan, Phys. Rev. 46, 868 (1934)

[c12] Bothe and Gentner, Naturwiss. 25, 126 (1937)

[c13] Kraus and Cork, Phys. Rev. 51, 382 (1937)

[c14] Reddeman and Strassmann, Naturwiss. 25, 458 (1937)

[c15] Pool, Cork and Thornton, Phys. Rev. 51, 890 (1937)

[c16] Richardson and Kurie, Phys. Rev. 50, 999 (1936)

[c17] Jacobsen, Nature 139, 879 (1937)

[c18] Alvarez, Phys. Rev. 52, 134 (1937)

[c19] Möller, Physik. Zeits. Sowjetunion 11, 9 (1937)

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Radioactivity in Silver Induced by Fast Neutrons

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References (19)

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