Abstract
The high-energy part of the spectrum of internal bremsstrahlung (IB) photons accompanying the allowed electron-capture (EC) transition from to the ground state of has been measured with a Ge(Li) -ray spectrometer supplied with a pileup rejector. The probability for emission of internal bremsstrahlung photons with energies higher than 523.7 keV per groundstate EC decay of was determined to be (9.0 ± 0.6)×. Comparable theoretical results for radiative capture of orbital electrons are 8.61 × , deduced from the theory of Martin and Glauber, and 8.60 × , deduced from recent improved calculations of Intemann. The confirmation of the predicted rate of radiative to ordinary capture in is in good agreement with our recent similar experiment on , but is partly at variance with previous IB -coincidence experiments on . The transition energy of was determined to be 851 ± 12 keV, in agreement with accepted atomic mass differences.
[RADIOACTIVITY ; measured internal bremsstrahlung, ; deduced , . Ge(Li) detector, pileup rejection, extrapolation method.]
- Received 13 July 1973
DOI:https://doi.org/10.1103/PhysRevC.8.2089
©1973 American Physical Society