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Radiative electron capture in the first forbidden unique decay of 81Kr

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arxiv 1008.1918 v1 pith:YKW2QKFU submitted 2010-08-11 nucl-ex nucl-th

Radiative electron capture in the first forbidden unique decay of 81Kr

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keywords capturedecayfirstforbiddenfoundintensityphotonspectrum
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The photon spectrum accompanying the orbital K-electron capture in the first forbidden unique decay of 81Kr was measured. The total radiation intensity for the photon energies larger than 50 keV was found to be 1.47(6) x 10^{-4} per K-capture. Both the shape of the spectrum and its intensity relative to the ordinary, non-radiative capture rate, are compared to theoretical predictions. The best agreement is found for the recently developed model which employs the length gauge for the electromagnetic field.

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