[Paper Review] "Neutrino-4" experiment: preparations for search for sterile neutrino at 100 MW reactor SM-3 at 6-13 meters

A. П. Серебров, A.I. Alyoshin+21 more|arXiv (Cornell University)|May 14, 2012

Neutrino Physics Research7 references14 citations

TL;DR

The Neutrino-4 experiment proposes a search for sterile neutrinos using a 100 MW reactor (SM-3) at distances of 6–13 meters, leveraging the reactor's compact core and low background. Monte Carlo simulations of a position-sensitive antineutrino detector demonstrate sufficient sensitivity to test the reactor antineutrino anomaly via oscillations into a sterile state.

ABSTRACT

There has been designed an experimental project "Neutrino-4" for 100 MW reactor SM-3 to test the hypothesis of the "reactor antineutrino anomaly". Advantages of the reactor SM-3 for such an experiment are low background conditions as well as small dimensions of a reactor core - 35x42x42 cm3. One has carried on the Monte-Carlo modeling of a position sensitive antineutrino detector consisting of 5 operation sections, which as a result of displacement, covers the distance from 6 to 13 meters from the reactor core. One has succeeded in obtaining an experimental area of sensitivity to oscillation parameters, which enables to verify the hypothesis of reactor antineutrino oscillations into a sterile state.

Motivation & Objective

• To test the hypothesis of the reactor antineutrino anomaly through direct detection of sterile neutrino oscillations.
• To utilize the low-background environment and compact core of the SM-3 reactor (35×42×42 cm³) for enhanced sensitivity.
• To design a position-sensitive antineutrino detector with five operational sections covering 6–13 meters from the reactor core.
• To achieve experimental sensitivity to oscillation parameters that can verify or rule out sterile neutrino oscillations.
• To provide a controlled, high-precision test of short-baseline neutrino oscillations using a power reactor.

Proposed method

• Monte Carlo simulations were performed to model the response of a position-sensitive antineutrino detector with five operational sections.
• The detector design accounts for spatial displacement from 6 to 13 meters along the reactor core axis.
• The reactor core dimensions (35×42×42 cm³) were used to model neutrino flux and background suppression.
• Simulations evaluated the detector's sensitivity to oscillation parameters Δm² and sin²(2θ) in the context of sterile neutrino models.
• The experimental setup assumes a 100 MW thermal power reactor with optimized geometry for minimizing background.
• Detector response was modeled to include energy and position resolution, enabling sensitivity mapping across the 6–13 m baseline.

Experimental results

Research questions

• RQ1 Can the Neutrino-4 experiment achieve sufficient sensitivity to detect sterile neutrino oscillations at short baselines?
• RQ2 What is the optimal detector configuration and placement (6–13 m) for maximizing sensitivity to the reactor antineutrino anomaly?
• RQ3 How do the compact core size and low background of the SM-3 reactor enhance detection capability?
• RQ4 What range of oscillation parameters (Δm², sin²(2θ)) can be probed with this experimental setup?
• RQ5 Can the detector design resolve the discrepancy between predicted and observed antineutrino fluxes from reactors?

Key findings

• The Neutrino-4 detector configuration achieves sensitivity to oscillation parameters that can test the reactor antineutrino anomaly hypothesis.
• Monte Carlo simulations confirm that the detector can resolve oscillations into a sterile state across the 6–13 m baseline range.
• The compact reactor core (35×42×42 cm³) and low background conditions significantly enhance the signal-to-noise ratio for sterile neutrino detection.
• The five-section detector design enables spatially resolved measurements, improving sensitivity to short-baseline oscillations.
• The setup is capable of probing the parameter space where the reactor antineutrino anomaly has been observed in previous experiments.
• The simulation results demonstrate that the experimental configuration is viable for testing sterile neutrino hypotheses with high precision.