imprint:
Springer Science and Business Media LLC, 2023
Published in:The European Physical Journal C
Language:
English
DOI:
10.1140/epjc/s10052-022-11151-w
ISSN:
1434-6052
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title><jats:p>The continuous emanation of <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{222}\hbox {Rn}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mrow>
<mml:msup>
<mml:mrow />
<mml:mn>222</mml:mn>
</mml:msup>
<mml:mtext>Rn</mml:mtext>
</mml:mrow>
</mml:math></jats:alternatives></jats:inline-formula> from detector surfaces causes the dominant background in current liquid xenon time projection chambers (TPCs) searching for dark matter. A significant reduction is required for the next generation of detectors which are aiming to reach the neutrino floor, such as DARWIN. <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{222}\hbox {Rn}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mrow>
<mml:msup>
<mml:mrow />
<mml:mn>222</mml:mn>
</mml:msup>
<mml:mtext>Rn</mml:mtext>
</mml:mrow>
</mml:math></jats:alternatives></jats:inline-formula>-induced backgrounds can be reduced using a hermetic TPC, in which the sensitive target volume is mechanically separated from the rest of the detector containing the majority of Rn-emanating surfaces. We present a hermetic TPC that mainly follows the well-established design of leading xenon TPCs and has been operated successfully over a period of several weeks. By scaling up the results achieved to the DARWIN-scale, we show that the hermetic TPC concept can reduce the <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{222}\hbox {Rn}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mrow>
<mml:msup>
<mml:mrow />
<mml:mn>222</mml:mn>
</mml:msup>
<mml:mtext>Rn</mml:mtext>
</mml:mrow>
</mml:math></jats:alternatives></jats:inline-formula> concentration to the required level, even with imperfect separation of the volumes.</jats:p>