Radiative Electron Capture in Be7

Börje I. Persson and Steven E. Koonin
Phys. Rev. C 5, 1443 – Published 1 May 1972
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Abstract

The continuous spectrum of photons accompanying the electron-capture transition from Be7 to the first excited state in Li7 has been measured in coincidence with the nuclear γ rays from the deexcitation of this state. The end-point energy of the photon spectrum was determined to be 388 ± 8 keV, in good agreement with accepted mass differences. The probability of 1s+2s radiative capture giving a photon energy greater than 50 keV per nuclear γ ray was determined to be (10.3 ± 0.6) × 105. This result should be compared with the value 9.2 × 105 predicted by the theory of Martin and Glauber. At energies higher than 120 keV the shape of the spectrum agrees with the predictions of theory. At energies lower than 120 keV the intensity falls off faster than expected from the theory. Exchange and overlap corrections to the radiative-capture theory have been calculated and shown to be too small to account for the observed discrepancy.

  • Received 21 January 1972

DOI:https://doi.org/10.1103/PhysRevC.5.1443

©1972 American Physical Society

Authors & Affiliations

Börje I. Persson and Steven E. Koonin

  • California Institute of Technology, Pasadena, California 91109

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Vol. 5, Iss. 5 — May 1972

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