Abstract
Borexino, a large volume liquid scintillator detector installed at Gran Sasso laboratory, demonstrated extraordinary sensitivity with respect to neutrino and antineutrino detection, reporting the best up to date results on low energy solar neutrino fluxes and performing geo-neutrino detection. Energy and position of 1 MeV events in Borexino are recon- structed with a precision of 5% and 14cm respectively. These performances together with extremely low background provides an excellent opportunity for the study of short distance neutrino oscillations on the eV mass scale with artificial neutrino sources.The possible layouts for 51Cr (monoenergetic neutrino) and 144Ce–144Pr (antineutrino from β-decay) source experiments in Borexino and the expected sensitivity to sterile neutrinos for three possible designs of the experiment are presented.
Highlights
The collected experimental data on neutrinos generally fit into the three-flavor oscillation model
Borexino an ideal detector to search for the neutrino oscillation on the short base of ∼1 m
In case one sterile neutrino with parameters corresponding to the central value of the reactor anomaly, SOX will surely discover the effect, prove the existence of oscillations and measure the parameters through the “oscillometry” analysis
Summary
The collected experimental data on neutrinos generally fit into the three-flavor oscillation model. The existence of oscillations at a scale of 1 eV naturally entails the existence of an extra type of neutrino. The number of types of neutrino n=3 ± 0.01 was determined from the experimental Z boson decay width; if there is a fourth type of neutrino, it must be neutral (sterile) in terms of weak interactions. The search for neutrino oscillations at the Δm2 ∼1 eV2 scale turns out to be a search for a sterile neutrino. If interpretation of the anomalies as neutrino short-base oscillations is the case, the corresponding oscillations pattern with characteristic dimention of the order of 1 meter can be searched for with a large position-sensitive detector irradiated with a compact neutrino source
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