Speakers
Description
The Photon Strength Function (PSF) database hosted by the IAEA [1,2] provides both experimental data and theoretical calculations. Experimental PSF data extracted using the Oslo method were compared to two theoretical models recommended on the IAEA database website. One model is purely phenomenological (SMLO) while the other is based on microscopic calculations (D1M-QRPA).
For all the nuclei present in the database for which the Oslo method was used to extract the PSF, data were averaged over 1 MeV energy bins from 1 to 8 MeV and comparisons between experimental data and theoretical calculations were made as a function of the number of nucleons, protons or neutrons, and quadrupole deformation. The overall agreement is within an order of magnitude but systematic trends revealed both the presence of experimental outliers suggesting potential issues with some measurements, and global trends suggesting an incomplete theoretical description.
Oslo data were assigned quality indicators based on the quality of the uncertainty analysis performed as well as the availability of external nuclear data used for normalization. Outliers were identified and correlations as function of the nuclear mass and quadrupole deformation will be presented.
This work is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contracts No. DE-AC02-05CH11231 and by the US Nuclear Data Program.
[1] https://www-nds.iaea.org/PSFdatabase
[2] S. Goriely, P. Dimitriou, M. Wiedeking et al., The European Physical Journal A 55, 172 (2019), 10.1140/epja/i2019-12840-1