Abstract
For the first time, the summation method has been coupled with a complete reactor model, in order to predict the antineutrino emission of a research reactor. This work, discussed in the first part of this paper, allows us to predict the low energy part of the antineutrino spectrum, evidencing the important contribution of actinides to the antineutrino emission. Experimental conditions at short distance from research reactors are challenging, because the reactor itself produces huge gamma background that induce accidental and correlated backgrounds in an antineutrino target. The understanding of this background is of utmost importance and triggered the second part of the work presented here.
Highlights
Antineutrinos arise from the fission product beta decays and are emitted in huge quantities by reactor cores: around 1019 antineutrinos/sec for a 100 MWe research reactor
The MURE simulation of the OSIRIS reactor is used to provide the amount in-core of all beta minus emitters as a function of time, allowing for the first time to take into account all the contributions, i.e., the fission products and the contribution of the actinides and heavy nuclei produced during core operation
The implementation of the periodic refueling of the core every 20 days by seventh made it possible to carry out a first study of the emitted antineutrino spectrum which could be measured at such a research reactor
Summary
Antineutrinos arise from the fission product beta decays and are emitted in huge quantities by reactor cores: around 1019 antineutrinos/sec for a 100 MWe research reactor. Their energy spectrum and flux reflect the composition of the fuel, and its thermal power [1, 2]. With the advance of generation of reactor neutrino experiments, new calculations of the main uranium and plutonium isotope antineutrino energy spectra were performed. The gamma energy spectra produced by the OSIRIS reactor was estimated using the developed reactor simulation and after propagated up to the antineutrino detector location to estimate the gamma flux rate. Part of the work performed on the gamma background of the OSIRIS reactor will be presented
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