INTERNAL BREMSSTRAHLUNG ACCOMPANYING THE 1S, 2S ELECTRON-CAPTURE IN BE-7

The total internal bremsstrahlung (IB) spectra accompanying electron c apture in Be-7 is measured using a NaI (Tl) scintillation spectrometer . Corrections for background and absorption are made. For analysis of the experimental data, a response matrix with dimensions of 46 energy bins and 140 channels is constructed. With the help of a detector asse mbly response matrix, the true IB energy spectrum is obtained by itera tive unfolding of the pulse-height distribution for comparison with th eoretical spectre. Also, the response matrix is used directly to fold the theoretical probabilities for comparison with the experimental pul se-height distribution. After all the necessary corrections are made, the experimental results are compared with the theoretical spectra rep orted by Morrison and Schiff and Martin and Glauber (1958). All the co mparisons reveal that our experimental data are in agreement with both theories.