Precise energy measurements of the first-excited state in 197Au
Institute for Nuclear Research, National Academy of Sciences - Prospect Nauki 47, 03680 Kiev, Ukraine
Accepted: 13 December 2011
The energy of the first-excited state in 197Au has been measured with high precision using conventional γ-ray spectroscopy with HPGe detectors. A γ77 keV line of 197Au and Kβ lines of Au are overlapped almost completely and such measurements present a very serious challenge. The coincidence measurements have been applied, first, with the γ77 keV line for the precise energy calibration using Kα and Kβ lines of Au, secondly, with Kα lines of Au for the precise energy measurement of the first-excited state in 197Au. Our current result is 77.339± 0.003 keV, confirming the observations of the recent 197Au NEET experiment performed at SPring-8, while, according to available nuclear data, the energy of the first-excited state in 197Au is 77.351±0.002 keV.
PACS: 23.20.Lv – γ transitions and level energies / 23.20.Nx – Internal conversion and extranuclear effects (including Auger electrons and internal bremsstrahlung) / 27.80.+w – 190 ≤ A ≤ 219
© EPLA, 2012