Speaker
Description
Detectable number of nuclear recoil (NR) events can occur from neutrinos from supernova (SN) bursts through the coherent elastic neutrino-nucleus scattering (CE$\nu$NS) process in large scale liquid xenon detectors designed for direct dark matter search depending on the SN mass and distance. In this presentation, we show that in addition to the direct NR events due to CE$\nu$NS process, the SN neutrinos can be detected via the nuclear recoils due to the elastic scattering of the neutrons produced due to the inelastic interactions of the neutrino with the xenon nuclei. We find that the contribution of the supernova neutrino-induced neutrons ($\nu$I$n$) can significantly modify the total xenon NR spectrum, at large recoil energies, from the spectrum expected from CE$\nu$NS contribution alone. Moreover, for recoil energies $>20$ keV, the dominant contribution is obtained from the ($\nu$I$n$) events. Using the nuclear spectra of both the CE$\nu$NS and the $\nu$I$n$ events, we numerically calculate the observable S1 and S2 signals for a typical liquid xenon based detector accounting for the multiple scattering effects for the $\nu$I$n$ and find that at sufficiently large signals events, S1$>$50 photo-electrons (PE) and S2$>$2300 PE, are dominantly contributed by $\nu$I$n$ scatterings. We note that since $\nu$I$n$ contribution to the recoil spectrum arises due to the charged current interaction of the SN $\nu_e$s with the target nuclei while the neutral current interactions, responsible for CE$\nu$NS events, comes from of all the six species of neutrinos, the capability of detecting these individual recoil events, especially in the S2 channel, in future large scale liquid xenon detectors may offer the possibility of extraction of information regarding the distribution of the SN explosion energy into different flavours of neutrinos.
| Reference to paper (DOI or arXiv) | 2012.13986 |
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