Radioactivity Induced in the Rare Earth Elements by Fast Neutrons

M. L. Pool and L. L. Quill
Phys. Rev. 53, 437 – Published 15 March 1938
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Abstract

With the exception of illinium, thulium and lutecium all the rare earth elements have been bombarded with slow and fast neutrons. The fast neutrons were obtained from the Li+D reaction. Deuterons of 6.3 Mev were produced by the cyclotron at the University of Michigan. The following periods for electron emission have been observed: La140 (31 hr.), Pr142 (19 hr.), Nd147 (84 hr.), Nd149 (2.0 hr.), Nd151 (21 min.), Il144 (12.5 hr.), Sm151 (21 min.), Sm153 (46 hr.), Eu152 (9.2 hr.), Tb160 (3.3 hr.), Dy165 (2.5 hr.), Ho164 (47 min.), Ho166 (30 hr.), Er169 (12 hr.) and Er171 (5.1 hr.) The following periods for positron emission have been observed: Ce139 (2.1 min.), Pr140 (3.5 min.), Eu150 (27 hr.), Tb158 (3.6 min.), Dy159 (2.2 min.) and Er165 (1.1 min.). There seems to be at least two isotopes which are isomeric: one is Gd159 (3.5 min., 17 hr.) and the other is Yb175 (2.1 hr., 14 hr.). From radioactivity data it is necessary to postulate the existence of four new stable isotopes: Gd152, Dy160, Er164 and Yb170. With the fast neutron bombardment seventeen n2n type of reactions have been found.

  • Received 15 January 1938

DOI:https://doi.org/10.1103/PhysRev.53.437

©1938 American Physical Society

Authors & Affiliations

M. L. Pool and L. L. Quill

  • Departments of Physics and Chemistry, Ohio State University, Columbus, Ohio

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Issue

Vol. 53, Iss. 6 — March 1938

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