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The nuclear fission process that occurs in the core of nuclear reactorsresults in unstable, neutron rich fission products that subsequently beta decayand emit electron anti-neutrinos. These reactor neutrinos have served neutrinophysics research from the initial discovery of the neutrino to currentprecision measurements of neutrino mixing angles. The prediction of theabsolute flux and energy spectrum of the emitted reactor neutrinos hinges upona series of seminal papers based on measurements performed in the 1970s and1980s. The steadily improving reactor neutrino measurement techniques andrecent re-considerations of the agreement between the predicted and observedreactor neutrino flux motivates revisiting the underlying beta spectrameasurements. A method is proposed to use an accelerator proton beam deliveredto an engineered target to yield a neutron field tailored to reproduce theneutron energy spectrum present in the core of an operating nuclear reactor.Foils of the primary reactor fissionable isotopes placed in this tailoredneutron flux will ultimately emit beta particles from the resultant fissionproducts. Measurement of these beta particles in a time projection chamber witha perpendicular magnetic field provides a distinctive set of systematicconsiderations for comparison to the original seminal beta spectrameasurements. Ancillary measurements such as gamma-ray emission andpost-irradiation radiochemical analysis will further constrain the absolutenormalization of beta emissions per fission. The requirements for unfolding thebeta spectra measured with this method into a predicted reactor neutrinospectrum are explored.

Method of Fission Product Beta Spectra Measurements for Predicting Reactor Anti-neutrino Emission