Poster Open Access

NEXT: NEW backgrounds and extrapolation to NEXT-100

NOVELLA, Pau


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    <subfield code="a">NEXT: NEW backgrounds and extrapolation to NEXT-100</subfield>
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    <subfield code="a">&lt;p&gt;The NEXT experiment aims at the sensitive search of the neutrino-less double beta decay of &lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mn"&gt;136&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
^{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 &lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="mi"&gt;&amp;beta;&lt;/span&gt;&lt;span class="mi"&gt;&amp;beta;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
\beta\beta
search. The internal &lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mn"&gt;222&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
^{222}
Rn activity has being measured, yielding &lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="mo"&gt;(&lt;/span&gt;&lt;span class="mn"&gt;37.5&lt;/span&gt;&lt;span class="mo"&gt;&amp;plusmn;&lt;/span&gt;&lt;span class="mn"&gt;2.3&lt;/span&gt;&lt;span class="mtext"&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mo"&gt;(&lt;/span&gt;&lt;span class="mi"&gt;s&lt;/span&gt;&lt;span class="mi"&gt;t&lt;/span&gt;&lt;span class="mi"&gt;a&lt;/span&gt;&lt;span class="mi"&gt;t&lt;/span&gt;&lt;span class="mo"&gt;.&lt;/span&gt;&lt;span class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class="mo"&gt;&amp;plusmn;&lt;/span&gt;&lt;span class="mn"&gt;5.9&lt;/span&gt;&lt;span class="mtext"&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mo"&gt;(&lt;/span&gt;&lt;span class="mi"&gt;s&lt;/span&gt;&lt;span class="mi"&gt;y&lt;/span&gt;&lt;span class="mi"&gt;s&lt;/span&gt;&lt;span class="mi"&gt;t&lt;/span&gt;&lt;span class="mo"&gt;.&lt;/span&gt;&lt;span class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class="mo"&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
(37.5\pm 2.3~\mathrm{(stat.)}\pm 5.9~\mathrm{(syst.)})
~mBq/m&lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mn"&gt;3&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
^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 &lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="mn"&gt;4&lt;/span&gt;&lt;span class="mo"&gt;&amp;times;&lt;/span&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mn"&gt;10&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mo"&gt;&amp;minus;&lt;/span&gt;&lt;span class="mn"&gt;4&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
4\times10^{-4}
~counts~keV&lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mo"&gt;&amp;minus;&lt;/span&gt;&lt;span class="mn"&gt;1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
^{-1}
~kg&lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mo"&gt;&amp;minus;&lt;/span&gt;&lt;span class="mn"&gt;1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
^{-1}
~yr&lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mo"&gt;&amp;minus;&lt;/span&gt;&lt;span class="mn"&gt;1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
^{-1}
, NEXT-100 will reach a sensitivity to the &lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="mi"&gt;&amp;beta;&lt;/span&gt;&lt;span class="mi"&gt;&amp;beta;&lt;/span&gt;&lt;span class="mn"&gt;0&lt;/span&gt;&lt;span class="mi"&gt;&amp;nu;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
\beta\beta0\nu
half-life of &lt;span class="MathJax"&gt;&lt;span class="math"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mrow"&gt;&lt;span class="mn"&gt;6&lt;/span&gt;&lt;span class="mo"&gt;&amp;times;&lt;/span&gt;&lt;span class="msubsup"&gt;&lt;span&gt;&lt;span&gt;&lt;span class="mn"&gt;10&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&lt;span class="texatom"&gt;&lt;span class="mrow"&gt;&lt;span class="mn"&gt;25&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
6\times10^{25}
y after 3 years of data taking.&lt;/p&gt;</subfield>
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