Nuclear Structure Decay Studies for Reactor Antineutrino Physics
Abstract
There are several intriguing features involving recent measurements and calculations of reactor antineutrino spectra including a deficient in the total number of measured antineutrinos, a spectra distortion in the region of 5-7 MeV antineutrino energy, and a fine structure which can be attributed to the decay of just a few out of the total 800 fission fragments making up the spectra. A full understanding of these aspects requires a solid basis of the underlying nuclear physics, namely the beta-decay properties of fission fragments used as inputs to calculate the spectra. Using the CARIBU facility at Argonne National Laboratory, we have performed new measurements on several key isotopes including 92Rb, 142La, and 141Cs. The decay of 92Rb was studied with the SATURN array, while the decays of 142La and 141Cs were observed with the Gammasphere array. The results of these analyses will be presented and their impact on reactor antineutrino calculations will be discussed.
Work supported by DOE NP under Co. DE-AC02-06CH11357, DE-AC02-98CH10886, and DOE NNSA under Award DE-AC52-07NA27344.- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DNP.LB003M