Positron Spectrum of O15

O. C. Kistner, A. Schwarzschild, B. M. Rustad, and D. E. Alburger
Phys. Rev. 105, 1339 – Published 15 February 1957
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Abstract

The positron spectrum of O15 has been investigated with two iron-free magnetic spectrometers. One measurement, performed with an intermediate-image spectrometer and a solid source, gave an end-point energy of 1.723±0.005 Mev. The other measurement, performed with a thin-lens spectrometer and a gaseous source, gave an end-point energy of 1.736±0.010 Mev. These values, which are approximately 0.050 Mev higher than the only previously reported spectrometer measurement, are in good agreement with the end point predicted from N15(p, n)O15 threshold determinations. The ft value calculated from an average end-point energy of 1.733±0.005 Mev derived from the beta spectra and the (p, n) threshold measurements is 4280±100 seconds. This new value brings the O15 decay into good agreement with the Bx analysis of the 0-0 spin change and the "doubly closed shell plus or minus one nucleon" beta transitions.

  • Received 8 November 1956

DOI:https://doi.org/10.1103/PhysRev.105.1339

©1957 American Physical Society

Authors & Affiliations

O. C. Kistner, A. Schwarzschild, and B. M. Rustad*

  • Columbia University, New York, New York, and Brookhaven National Laboratory, Upton, New York

D. E. Alburger*

  • Brookhaven National Laboratory, Upton, New York

  • *Under contract with the U. S. Atomic Energy Commission.

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Issue

Vol. 105, Iss. 4 — February 1957

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