INTERNAL BREMSSTRAHLUNG SPECTRUM ACCOMPANYING IS ELECTRON CAPTURE IN DECAY OF Fe$sup 55$, Cs$sup 131$, AND Tl$sup 20$$sup 4$
The internal bremsstrahlung spectra in coincidence with the K x rays resulting from 1S electron capture in Fe/sup 55/ and Cs/sup 131/ were measured. The results are in good agreement with Martin and Glauber's revised calculations including relativistic and screenlng effects. The shape of the coincidence spectra exhibits a maximum at the predicted energy and then drops off in intensity toward the low-energy region. This is markedly different front that of the total bremsstrahlung spectrum, which rises continuously toward the low-energy region. In the case of Cs/sup 131/, the shape of the bremsstrahlung spectrum pertaining to the radiative capture of P electrons as obtained by subtracting from the total spectrum the spectrum due to S-electron capture is also in good accord with that predicted. An estimate of the total probability for bremsstrahlung production during 1S electron capture as obtained by comparing the corresponding bremsstrahlung spectrum with the x-ray intensity gives 1.5 plus or minus 0.8 x 10/sup -5/ for Fe/sup 55/ and 1.4 plus or minus 1 x 10/sup -5/ for Cs/sup 131/, which is in fair agreement with the theoretical prediction including relativistic corrections. The end point of the 1S electron capture bremsstrahlung spectrum of Tl/sup 204/ was also measured and found to be 310 plus or minus 10 kev. (auth)
- Research Organization:
- Columbia Univ., New York
- NSA Number:
- NSA-16-014010
- OSTI ID:
- 4785736
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 125; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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