Neutrino 2018 - XXVIII International Conference on Neutrino Physics and Astrophysics

4-9 June 2018
Heidelberg
Europe/Berlin timezone
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Contribution Poster 0vbb

Poster (not participating in poster prize competition)

NEXT: NEW backgrounds and extrapolation to NEXT-100

Speakers

• Mr. Pau NOVELLA

Authorship annotation

for the NEXT collaboration

Session and Location

Monday Session, Poster Wall #49 (Auditorium Gallery Right)

Abstract content

The NEXT experiment aims at the sensitive search of the neutrino-less double beta decay of $^{136}$Xe at the LSC. A large-scale prototype of a high-pressure gas-Xenon electroluminescent TPC (NEW) is being operated since 2016, proving both the excellent energy resolution and the topological capabilities for background rejection. NEW is currently measuring the backgrounds for the $\beta\beta$ search. The internal $^{222}$Rn activity has being measured, yielding $(37.5\pm 2.3~\mathrm{(stat.)}\pm 5.9~\mathrm{(syst.)})$~mBq/m$^3$. The Rn-induced electron background has been characterized allowing for the validation of the MC expectations. The corresponding extrapolation to the NEXT-100 detector demonstrates that Rn will not be a dominant background source. For an expected total background below $4\times10^{-4}$~counts~keV$^{-1}$~kg$^{-1}$~yr$^{-1}$, NEXT-100 will reach a sensitivity to the $\beta\beta0\nu$ half-life of $6\times10^{25}$ y after 3 years of data taking.

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