We present an analysis on the sensitivity to the active-sterile neutrino mixing with Germanium (Ge) and Silicon (Si) detectors in the context of the proposed coherent elastic neutrino-nucleus experiment in India. The study has been carried out with 3 $(\mathrm{active})+1(\mathrm{sterile})$ neutrino oscillation model. It is observed that the measurements that can be carried out with the Ge detector exhibit better sensitivity to the active-sterile neutrino mixing as compared to the Si detector. Both detectors are able to exclude most of the anomaly regions observed by the GALLIUM experiment. The Ge detector with mass 10 kg, can observe the active-sterile neutrino oscillation at 95% confidence level, provided that ${\sin }^{2}2{\theta }_{14}\ge 0.09$ at $\mathrm{\Delta }{m}_{41}^2=1.0{\mathrm{eV}}^2$ for an exposure of 1-yr. At higher values of $\mathrm{\Delta }{m}_{41}^2$, a better sensitivity is obtained at a short baseline. It is also found that the threshold as well as resolution of the detectors play a crucial role on the measurements of active-sterile neutrino mixing parameters.

• Received 28 August 2023
• Accepted 9 November 2023

DOI:https://doi.org/10.1103/PhysRevD.108.113002

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Published by the American Physical Society