Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268


Thu., September 28, 2017, at 3:00 PM - 4:00 PM (refreshments served 2:40 PM)

Recent Reactor Anti-neutrino Flux and Spectrum Measurements

Bryce Littlejohn, Illinois Institute of Technology, Chicago, Illinois
Bldg. 6008 Large Conference Room

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.

Contact: Alfredo Galindo-Uribarri, (865) 574-6124