Abstract
The emission probabilities for the γ-rays of 75Ge were accurately measured by a 4πβ counter, a high purity germanium γ-ray detector and a coincidence apparatus using a live-timed bi-dimensional data acquisition system. Two series of measurements were carried out; in the first a 4πβ counter with pressurized Ar 90% plus CH4 10% mixture was used, and in the second that with CF4 gas at atmospheric pressure was used. The emission probability of the main 265 keV γ-rays was 0.1020±0.0017, that was smaller than the evaluated value, 0.113 ± 0.011 (Nucl. Data Sheets, 1981), by about 10%, and the certainty was improved by about six times.
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