NOVELLA, Pau
2018-06-29
<p>The NEXT experiment aims at the sensitive search of the neutrino-less double beta decay of <span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="msubsup"><span><span><span class="texatom"><span class="mrow"><span class="mn">136</span></span></span></span></span></span></span></span></span></span></span>
^{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 <span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="mi">β</span><span class="mi">β</span></span></span></span></span></span>
\beta\beta
search. The internal <span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="msubsup"><span><span><span class="texatom"><span class="mrow"><span class="mn">222</span></span></span></span></span></span></span></span></span></span></span>
^{222}
Rn activity has being measured, yielding <span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="mo">(</span><span class="mn">37.5</span><span class="mo">±</span><span class="mn">2.3</span><span class="mtext"> </span><span class="texatom"><span class="mrow"><span class="mo">(</span><span class="mi">s</span><span class="mi">t</span><span class="mi">a</span><span class="mi">t</span><span class="mo">.</span><span class="mo">)</span></span></span><span class="mo">±</span><span class="mn">5.9</span><span class="mtext"> </span><span class="texatom"><span class="mrow"><span class="mo">(</span><span class="mi">s</span><span class="mi">y</span><span class="mi">s</span><span class="mi">t</span><span class="mo">.</span><span class="mo">)</span></span></span><span class="mo">)</span></span></span></span></span></span>
(37.5\pm 2.3~\mathrm{(stat.)}\pm 5.9~\mathrm{(syst.)})
~mBq/m<span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="msubsup"><span><span><span class="mn">3</span></span></span></span></span></span></span></span></span>
^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 <span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="mn">4</span><span class="mo">×</span><span class="msubsup"><span><span><span class="mn">10</span></span><span><span class="texatom"><span class="mrow"><span class="mo">−</span><span class="mn">4</span></span></span></span></span></span></span></span></span></span></span>
4\times10^{-4}
~counts~keV<span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="msubsup"><span><span><span class="texatom"><span class="mrow"><span class="mo">−</span><span class="mn">1</span></span></span></span></span></span></span></span></span></span></span>
^{-1}
~kg<span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="msubsup"><span><span><span class="texatom"><span class="mrow"><span class="mo">−</span><span class="mn">1</span></span></span></span></span></span></span></span></span></span></span>
^{-1}
~yr<span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="msubsup"><span><span><span class="texatom"><span class="mrow"><span class="mo">−</span><span class="mn">1</span></span></span></span></span></span></span></span></span></span></span>
^{-1}
, NEXT-100 will reach a sensitivity to the <span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="mi">β</span><span class="mi">β</span><span class="mn">0</span><span class="mi">ν</span></span></span></span></span></span>
\beta\beta0\nu
half-life of <span class="MathJax"><span class="math"><span><span><span class="mrow"><span class="mn">6</span><span class="mo">×</span><span class="msubsup"><span><span><span class="mn">10</span></span><span><span class="texatom"><span class="mrow"><span class="mn">25</span></span></span></span></span></span></span></span></span></span></span>
6\times10^{25}
y after 3 years of data taking.</p>
https://doi.org/10.5281/zenodo.1300600
oai:zenodo.org:1300600
Zenodo
https://zenodo.org/communities/neutrino2018
https://doi.org/10.5281/zenodo.1300599
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
NEXT: NEW backgrounds and extrapolation to NEXT-100
info:eu-repo/semantics/conferencePoster