Coherency in Neutrino-Nucleus Elastic Scattering

Elastic scattering of neutrino with nucleus (v Ael ) is the well defined weak interaction processes in the Standard Model. The TEXONO collaboration adopt electro-cooled point contact Germanium detector technology with sub-keV sensitivities for the detection of v Ael with reactor neutrinos. The detection of v Ael cross-section is beneficial in studies of irreducible background in dark matter experiments, study of Solar and Supernova processes, etc. It also provides the probe the quantum mechanical coherence effects in electroweak interactions. We defined a parameter α to measure degree of coherency in v Ael . Reactor neutrinos are found to be one of the best candidates to probe v Ael with high coherency. The divergence from full coherence leads to the study of neutron density distribution and to constrain the sensitivities in probing physics beyond the Standard Model.