Supported by the China Postdoctoral Science Foundation (2018M643283), the National Key R&D program of China ( 2018YFA0404103) and the National Natural Science Foundation of China (NSFC) (11775315)
This work extends the idea of using a cyclotronbased antineutrino source for purposes of neutrino physics. Long baseline experiments suffer from degeneracies and correlations between
Article funded by SCOAP^{3}
In the framework of 3flavor neutrino mixing through PontecorvoMakiNakagawaSakata [
It is clear that if
Since the leading approximation of oscillation probability for reactor experiments does not depend on the mixing angle
The full description of our proposal is presented in [
where
The estimated IBDevent spectrum as a function of energy is depicted in
(color online) The shape of the IBDevent spectrum as a function of energy for two values of
Event rate analysis is based on statistical treatment of the expected IBD signal rate inside the detector. Initial muon antineutrinos have a continuous spectrum with an endpoint of 52.8 MeV. In order to exclude a significant part of the atmospheric background, we chose an energy window between 20 and 52.8 MeV. However, this is not sufficient to disregard the background completely.
The current statistical analysis is devided in two parts. The first part concerns the sensitivity to octant degeneracy; the second part is about the precise measurement of
We follow the socalled classical method of calculating a confidence level. This method is based on the calculation of a
A
In general, the sensitivity to octant degeneracy can be calculated by minimization of a
where “min” means that both chisquare functions
where 45° corresponds to a border between two octants.
We use the chisquare function presented in [
where the pullterm includes Poisson statistics, and takes into account the background and flux normalization. Additional Gaussian penalties are also added.
Here,
where
where
The estimation of the accuracy of measurement for the current best fit value of
Further, we give a set of oscillation parameters and their uncertainties taken from PDG in
The list of oscillation parameters and their uncertainties from PDG [








7.53  2.51  0.307 

2.12 

0.18  0.05  0.013  0.026  0.08 
The expected electron antineutrino event spectra at a distance of 20 km were simulated using the MonteCarlo method including oscillations. The energy resolution of the JUNO detector is 3% per MeV. The beam power of the far cyclotron is 5 or 10 MW with systematic flux uncertainty
To investigate the sensitive region of octant degeneracy, 1k MC “fake” experiments were calculated for each sample with particular fixed values of
In order to evaluate the potential of JUNO to accurately measure the mixing angle
Experimental sensitivity to octant degeneracy is depicted in
(color online) The sensitive area for determining the octant as a function of
In the pink area the octant can be determined with a significance of more than 3
The wave behavior of curves in
(color online) Measurement accuracy of the mixing angle
The present work demonstrates another application of superconducting cyclotrons for measurements in neutrino physics. The transition channel
It was shown that the distinction between LO and UO is comparable to the combined analysis of T2K and NO
The combination of JUNO and superconducting cyclotrons could be a good alternative to conventional beam experiments. It would allow the measurement of