Radiative Orbital Electron Capture inCo57

The spectrum of the internal bremsstrahlung accompanying the orbital electron capture in ${}_{}{}^{57}{}_{}{}^{}\mathrm{Co}$ was investigated in the energy range from 180 to 465 keV. The disintegration energy of ${}_{}{}^{57}{}_{}{}^{}\mathrm{Co}$ to the second excited state of ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ was found to be 674 ± 30 keV. The ratio of the probabilities of the total radiative capture to the nonradiative $1s$ electron capture was found to be (0.98 ± 0.2) × ${10}^{-4\mathrm{}}$ as compared to the theoretically predicted value of 1.35 × ${10}^{-4\mathrm{}}$ for the investigated energy range. A comparison with the results of other intensity measurements of the internal bremsstrahlung is given.