Internal Bremsstrahlung Accompanying the Electron-Capture Decay ofMn54

The internal-bremsstrahlung spectrum accompanying the decay of ${\mathrm{Mn}}^{54}$ was investigated. The spectrum was compared with the theoretical predictions of Martin and Glauber using a computer fitting routine. The decay energy corresponding to the transition to the first excited state of ${\mathrm{Cr}}^{54}$ was found to be 512±25 keV. The intensity of the total internal bremsstrahlung in the energy range 100-420 keV was found to be (0.65±0.15)×${10}^{-4\mathrm{}}$ per $1S$ capture as compared to the theoretical value of 1.01×${10}^{-4\mathrm{}}$.