Recent Reactor Anti-Neutrino Flux and Spectrum Measurements

Recent Reactor Anti-Neutrino Flux and Spectrum Measurements


  • Bryce Littlejohn, Illinois Institute of Technology, Chicago
September 28, 2017 - 3:00pm to 4:00pm


Current models of anti-neutrino production in nuclear reactors predict absolute detection rates and energy spectra at odds with the existing body of direct reactor anti-neutrino measurements. In this talk, I will overview the recent reactor anti-neutrino measurements and theoretical work that have laid bare these discrepancies, while also discussing primary popular explanations for the disagreements. I will focus on recent measurements by the Daya Bay experiment that have particular relevance in distinguishing between these differing hypotheses. The Daya Bay experiment has utilized eight functionally identical underground detectors to sample reactor anti-neutrino fluxes from three pairs of nuclear reactors in South China, accruing, in the past four years of operation, the largest reactor anti-neutrino sample to date. In its most recent result, Daya Bay has measured correlations between reactor core fuel evolution and changes in its detected anti-neutrino flux and spectrum, enabling new constraints on anti-neutrino production by the primary fission isotopes U-235 and Pu-239. I will close by discussing how future reactor anti-neutrino experiments, like PROSPECT, can use highly-enriched uranium reactors to further elucidate anti-neutrino production by the dominant fission isotopes.

Additional Information 

Refreshments will be served at 2:40 PM.

Sponsoring Organization 

Physics Division


  • Building: 6008
  • Room: Large Conference Room

Contact Information