Artificial radioactivity | Zendy

J. W. T. Spinks | Zendy

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Artificial radioactivity

Author(s) -

J. W. T. Spinks

Publication year - 1934

Publication title -

proceedings of the royal society of london series a containing papers of a mathematical and physical character

Language(s) - English

Resource type - Journals

eISSN - 2053-9150

pISSN - 0950-1207

DOI - 10.1098/rspa.1934.0149

Subject(s) - radiochemistry , induced radioactivity , proton , neutron , curie , isotope , radionuclide , chemistry , nuclear physics , physics , curie temperature , quantum mechanics , ferromagnetism

The new phenomenon of induced radioactivity discovered by Curie and Joliot presents many points of exceptional interest. It appears that when α-particles collide with aluminium nuclei two different processes may occur. A proton may be ejected Al13 27 + He2 4 → Si14 30 + H1 1 , leaving a stable isotope of silicon. This is the process which has been investigated in great detail, notably by Chadwick and his collaborators. Alternatively a neutron may be ejected instead of the proton leaving an isotope of phosphorus Al13 27 + He2 4 → P15 30 +n 0 1 . This element, calledradio-phorus by its discoverers, Curie and Joliot, disintegrates with emission of positrons with a period of about 3 minutes P15 30 → Si14 30 + ε+ .

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