Published July 1, 1940
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Journal Article
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Radioactive isotopes of Sr, Y and Zr
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Abstract
Radioactive isotopes formed by bombardment of Rb, Sr and Y by protons, deuterons and neutrons are reported. The following are the periods and assignments: 2.75-hr. (Sr87*, e-, γ); 70-min. (Sr85, e-, γ); 66-day (Sr85, K, γ); 80-hr. (Y87, K); 14-hr. (Y87, e-, γ); 105-day (Y86, K, γ); 4.5-min. (Zr89, γ); 78-hr. (Zr89, β+). (In each case e- means conversion electrons, not nuclear β-rays.) The electron spectrum of the 2.75-hr. Sr87* shows a single line at 360 kev and this period is shown to grow from the 80-hr. Y87, but not from the 14-hr. isomer.
Additional Information
©1940 The American Physical Society. Received 22 April 1940. The authors are indebted to many members of the laboratory for help with this work. Especially we wish to thank Mr. R. L. McCreary and Dr. G. E. Valley for assistance with the cloud chamber and the β-ray spectrograph, and Mr. Gerhard Dessauer for assistance with the chemical separations.Files
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