Current updates on cross section measurement of the coherent elastic neutrino nucleus scattering at the Kuo-Sheng neutrino laboratory

Shuvadeep Karmakar^1,2*, Manoj Kumar Singh¹, V. Sharma³, H. T. Wong¹

¹Institute of Physics, Academia Sinica, Taipei, Taiwan
²Department of Physics, Institute of Applied Sciences and Humanities, GLA University, Mathura, Uttar Pradesh, India
³Department of Physics, H.N.B. Garhwal University, Srinagar, Uttarakhand, India

* Presenter:Shuvadeep Karmakar, email:skarmakar@gate.sinica.edu.tw

Abstract: Reactor is one of the appealing source to look for the coherent elastic neutrino nucleus scattering provided the low energy neutrinos. Here in this work we will present our latest measurement on the cross section for coherent elastic neutrino nucleus scattering with neutrinos from the Kuo-Sheng reactor neutrino laboratory. For this purpose we have exploited the data sets, taken with the electro-cooled p-type point contact Germanium detector with the achieved threshold of 200 eV ee . The 3.8 times excess, compared to the standard model predicted cross section is excluded at 90% C.L. upper limit for standard Lindhard k = 0.157, with ON/OFF data size of 245/560 kg.days. We also have compared our limits with the other experiments focused on the reactor neutrinos with germanium detector. Our derived limit is found be competitive in the 3σ allowed region of quenching factor measurement for the Lindhard free parameter k.

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Keywords: electroweak interaction, neutrino, standard model, Coherent elastic neutrino nucleus scattering