Poster Open Access

NEXT: NEW backgrounds and extrapolation to NEXT-100

NOVELLA, Pau


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    "description": "<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>\n^{136}\nXe 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\">&beta;</span><span class=\"mi\">&beta;</span></span></span></span></span></span>\n\\beta\\beta\nsearch. 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>\n^{222}\nRn 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\">&plusmn;</span><span class=\"mn\">2.3</span><span class=\"mtext\">&nbsp;</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\">&plusmn;</span><span class=\"mn\">5.9</span><span class=\"mtext\">&nbsp;</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>\n(37.5\\pm 2.3~\\mathrm{(stat.)}\\pm 5.9~\\mathrm{(syst.)})\n~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>\n^3\n. 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\">&times;</span><span class=\"msubsup\"><span><span><span class=\"mn\">10</span></span><span><span class=\"texatom\"><span class=\"mrow\"><span class=\"mo\">&minus;</span><span class=\"mn\">4</span></span></span></span></span></span></span></span></span></span></span>\n4\\times10^{-4}\n~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\">&minus;</span><span class=\"mn\">1</span></span></span></span></span></span></span></span></span></span></span>\n^{-1}\n~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\">&minus;</span><span class=\"mn\">1</span></span></span></span></span></span></span></span></span></span></span>\n^{-1}\n~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\">&minus;</span><span class=\"mn\">1</span></span></span></span></span></span></span></span></span></span></span>\n^{-1}\n, NEXT-100 will reach a sensitivity to the <span class=\"MathJax\"><span class=\"math\"><span><span><span class=\"mrow\"><span class=\"mi\">&beta;</span><span class=\"mi\">&beta;</span><span class=\"mn\">0</span><span class=\"mi\">&nu;</span></span></span></span></span></span>\n\\beta\\beta0\\nu\nhalf-life of <span class=\"MathJax\"><span class=\"math\"><span><span><span class=\"mrow\"><span class=\"mn\">6</span><span class=\"mo\">&times;</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>\n6\\times10^{25}\ny after 3 years of data taking.</p>", 
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    "title": "NEXT: NEW backgrounds and extrapolation to NEXT-100", 
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