Results from the EUROMET action 410 concerning the decay data of 169Yb |
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| Affiliation: | 1. iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa;2. Physics Department, University of Stellenbosch, Matieland, 7602, South Africa;3. Institut d''Astronomie et d''Astrophysique, Université Libre de Bruxelles, CP 226, B-1050 Brussels, Belgium;4. Department of Applied Physics and Engineering Mathematics, University of Johannesburg, Johannesburg, 2028, South Africa;5. Department of Physics, University of Oslo, N-0316 Oslo, Norway;6. Lawrence Livermore National Laboratory, Livermore, CA 94551, USA;7. Helmholtz Institute Mainz, 55099 Mainz, Germany;8. GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany;1. 88-Inch Cyclotron, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA;2. Department of Nuclear Engineering, University of California, 4155 Etcheverry Hall, MC 1730, Berkeley, CA 94720, USA;3. Physical Sciences Laboratories, The Aerospace Corporation, 355 S. Douglas Street, El Segundo, CA 90245, USA;4. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;5. The University of Southern California, Los Angeles, CA 90089;1. Department of Nuclear Engineering, University of California, Berkeley, CA 94720, USA;2. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;3. Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94720, USA |
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| Abstract: | ![]()
An international comparison EUROMET, action No. 410, was organized with the objective of improving the knowledge of nuclear data for 169Yb decay. To determine the photon emission probabilities, the participants were asked to measure at least one of the quantities, activity per unit mass and/or photon emission rate per unit mass. In addition, the participants were requested to report the count rates observed with point source samples for an eventual coaxial-type germanium detector characterization. Eleven laboratories participated, giving one or more sets of results. In all, 34 sets of results were received, 17 for the activity measurement, 11 for the photon emission rate measurement and six for the detector characterization.Using the accurate activity value obtained from this exercise, it was possible to determine the emission probabilities of the main X- and γ-rays with an uncertainty of 1–2% for the LX-rays, 1 % for the KX-rays and ≤0.5% for the main γ-rays. These data can be very useful for the calibration of so-called ‘γ–X ray detectors’. The measurement of 169Yb with type P or N coaxial structure detectors has also made possible an estimation of their diameters and volumes. |
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