Related Experiment Videos
Evaluation of 169Yb decay data
Marie-Martine Bé1, Eckart Schönfeld, Jean Morel
1BNM-CEA/LNHB, Laboratoire National Henri Becquerel, Gif-sur-Yvette, France. mmbe@cea.fr
Summary
This study provides a consistent decay scheme for Ytterbium-169 (169Yb), based on international measurements. Key findings include a precise half-life and recommended emission probabilities for gamma rays, crucial for nuclear data applications.
Area of Science:
- Nuclear Physics
- Radiochemistry
- Metrology
Background:
- Accurate decay data are essential for various applications, including medical imaging and nuclear safeguards.
- Previous evaluations of the 169Yb decay scheme have shown inconsistencies.
- An international collaborative effort was initiated to address these discrepancies.
Purpose of the Study:
- To establish a comprehensive and consistent decay scheme for 169Yb.
- To refine the half-life and emission probabilities of key gamma-ray transitions.
- To provide reliable nuclear data for the scientific community.
Main Methods:
- Compilation and critical evaluation of recent experimental data from 11 international laboratories.
- Analysis of independent experimental results to ensure robustness.
- High-quality measurements of gamma-ray energies and intensities.
Main Results:
- The decay scheme of 169Yb is demonstrated to be highly consistent.
- The half-life of 169Yb is determined to be 32.018 (5) days.
- Recommended emission probabilities for 198 keV and 307 keV gamma lines are 35.93 (12)% and 10.046 (45)%, respectively.
Conclusions:
- The international exercise successfully yielded a consistent decay scheme for 169Yb.
- The recommended values provide an improved standard for nuclear decay data.
- This work enhances the reliability of 169Yb as a calibration source.