Letter | Published:

Spontaneous Emission of Neutrons from Radioactive Isotopes

Nature volume 134, page 215 (11 August 1934) | Download Citation

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Abstract

IN confirming the pioneer work of Fermi1 on radio-activity induced by neutron bombardment, Curie, Joliot and Preiswerk2 have shown that the radio active isotopes produced when phosphorus and magnesium are bombarded by neutrons emit: (1) negative electrons, (2) high energy –radiation ( 5 × 106 e.v.), (3) positrons (which they tenta tively ascribe to pair formation, this explanation being very doubtful as the high energy limit of these electrons was 1·0 × 106 e.v.), (4) neutrons. The neutron emission they ascribe to 14Si31 and 13Al28, unstable isotopes produced by the initial neutron bombardment.

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Author information

Affiliations

  1. Department of Physics, Washington Singer Laboratories, University College, Exeter.

    • H. J. WALKE

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DOI

https://doi.org/10.1038/134215a0

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