JUNO Sensitivity to Invisible Decay Modes of Neutrons
Massless particle
DOI:
10.48550/arxiv.2405.17792
Publication Date:
2024-05-27
AUTHORS (659)
ABSTRACT
We explore the bound neutrons decay into invisible particles (e.g., $n\rightarrow 3 \nu$ or $nn \rightarrow 2 \nu$) in JUNO liquid scintillator detector. The includes two modes: $ n { inv} and nn $. decays of $s$-shell $^{12}{\rm C}$ will leave a highly excited residual nucleus. Subsequently, some de-excitation modes nuclei can produce time- space-correlated triple coincidence signal Based on full Monte Carlo simulation informed with latest available data, we estimate all backgrounds, including inverse beta events reactor antineutrino $\bar{\nu}_e$, natural radioactivity, cosmogenic isotopes neutral current interactions atmospheric neutrinos. Pulse shape discrimination multivariate analysis techniques are employed to further suppress backgrounds. With years exposure, is expected give an order magnitude improvement compared best limits. After 10 data taking, sensitivities at 90% confidence level $\tau/B( ) > 5.0 \times 10^{31} \, {\rm yr}$ 1.4 10^{32} yr}$.
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