The Disintegration of As72

J. Y. Mei, Allan C. G. Mitchell, and C. M. Huddleston
Phys. Rev. 79, 19 – Published 1 July 1950
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Abstract

The spectra of the various radioactive arsenics produced by high energy alpha-particle bombardment of gallium have been studied using a magnetic lens spectrograph. These isotopes consist of As72 (26 h), As74 (19.5 d), As73 (90 d) and As71 (60 h). The main investigation concerns As72. This element is found to emit five positron groups of end-point energies 3.339 (19.3 percent), 2.498 (64.6 percent), 1.844 (12.1 percent), 0.669 (5.0 percent) and 0.271 (2.0 percent) Mev. A strong gamma-ray of energy 0.835 Mev together with many weak gamma-rays with energies up to 3 Mev have been found. The levels of the product nucleus Ge72 agree well with those found from a study of Ga72. The highest energy positron group has a forbidden shape. The spectrum of As74 consists of one gamma-ray of energy 0.593 Mev, two negatron groups of energies 1.45 and 0.82 Mev together with a positron group of energy about 0.96 Mev. As73 disintegrates by K-electron capture and the emission of an internal conversion line corresponding to a gamma-ray of 0.052 Mev. An internal conversion line corresponding to a gamma-ray at 0.162 Mev is ascribed to As71.

  • Received 23 March 1950

DOI:https://doi.org/10.1103/PhysRev.79.19

©1950 American Physical Society

Authors & Affiliations

J. Y. Mei, Allan C. G. Mitchell, and C. M. Huddleston

  • Indiana University, Bloomington, Indiana

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Issue

Vol. 79, Iss. 1 — July 1950

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