Evidence for Small Deviations in the Allowed Positron Spectrum of Zr89

J. H. Hamilton, L. M. Langer, and W. G. Smith
Phys. Rev. 119, 772 – Published 15 July 1960
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Abstract

The decay of Zr89 has been carefully studied with magnetic and scintillation spectrometers with special emphasis on the detailed shape of the positron spectrum. The decay scheme has been verified. The positron decay is by a single, allowed group followed by a single 915-kev gamma ray. The Zr89 spectrum has a nonstatistical shape corresponding to an excess of low-energy beta particles. Theoretical refinements for screening and finite deBroglie wavelength were applied but were found to be much too small to explain the observed deviation from a statistical spectrum. The same shape factor that was found to fit the In114, Y90, P32, and Na22 data (in addition to the once forbidden, unique shape factor for Y90) also fits the Zr89 data, i.e., (1+bW) with 0.2b0.4. It is significant that the deviation has the same direction and approximate magnitude as was found for the electron spectra.

  • Received 23 February 1960

DOI:https://doi.org/10.1103/PhysRev.119.772

©1960 American Physical Society

Authors & Affiliations

J. H. Hamilton

  • Physics Department, Indiana University, Bloomington, Indiana and Vanderbilt University, Nashville, Tennessee

L. M. Langer

  • Physics Department, Indiana University, Bloomington, Indiana

W. G. Smith

  • Physics Department, Indiana University, Bloomington, Indiana and Purdue University, Lafayette, Indiana

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Issue

Vol. 119, Iss. 2 — July 1960

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