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Author  |
NEXT Collaboration (Cortes-Parra, C. et al); Ayet, S.; Cid, M.; Cortes-Parra, C.; Kellerer, F.; Lopez-March, N.; Martin-Albo, J.; Martinez-Lema, G.; Martinez-Vara, M.; Novella, P.; Querol, M.; Renner, J.; Romo-Luque, C.; Saharia, P.; Simon, A.; Sorel, M.; Soto-Oton, J.; Teruel-Pardo, S.; Villamil, J.D. |
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Title |
Radon-induced backgrounds in the NEXT-100 experiment |
Type |
Journal Article |
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Year |
2026 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
09 |
Issue |
9 |
Pages |
082 - 20pp |
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Keywords |
Dark Matter and Double Beta Decay (experiments); Rare Decay |
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Abstract |
The NEXT-100 detector at the LSC aims at the first competitive search for the 0 nu beta beta decay using a high-pressure 136Xe electroluminescent time projection chamber. The first low-background run of NEXT-100 at 3.95 bar has been devoted to the measurement of the radon-induced backgrounds impacting this search. The contributions from both the internal and external airborne radon have been evaluated. The internal 222Rn activity is found to be (0.95 +/- 0.04(stat)+/- 0.09(sys)) Bq/m3, while no traces of 220Rn have been observed. Most of the 222Rn progeny plate-out on the surface of the cathode of the detector, leading to a rate of Rn-induced 214Bi of (0.97 +/- 0.05(stat)+/- 0.10(sys)) Hz for visible energies above 400 keV. The corresponding background index in the 0 nu beta beta region of interest is evaluated as (7.3 +/- 1.5(stat)+/- 0.8(sys))& times;10-4 counts/(keV & centerdot;kg & centerdot;yr) after selection of the fully contained events. This background index is reduced to similar to 4 & times;10-5 counts/(keV & centerdot;kg & centerdot;yr) by applying a topological selection requiring only one double-electron-like track in the events. This value is one order of magnitude below the total radiogenic background expectation in NEXT-100. By analyzing the correlation of the airborne radon activity and the measured rate of events in NEXT-100, it is concluded that the detector operates in a virtually radon-free environment thanks to the radon abatement system of the LSC. |
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Address |
[Hauptman, J.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA, Email: camilo.cortes@ific.uv.es; |
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Publisher |
Springer |
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English |
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Notes |
WOS:001869263600002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7423 |
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