UCL Discovery

## The neutron background of the XENON100 dark matter experiment

Aprile, E; Alfonsi, M; Arisaka, K; Arneodo, F; Balan, C; Baudis, L; Bauermeister, B; ... Weinheimer, C; + view all (2013) The neutron background of the XENON100 dark matter experiment. Journal of Physics G: Nuclear and Particle Physics , 40 (11) , Article 115201. 10.1088/0954-3899/40/11/115201.

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Ghag_the neutron background of_XENON100_aam.pdf - Accepted version

## Abstract

The XENON100 experiment, installed underground at the Laboratori Nazionali del Gran Sasso (LNGS), aims to directly detect dark matter in the form of Weakly Interacting Massive Particles (WIMPs) via their elastic scattering off xenon nuclei. This paper presents a study on the nuclear recoil background of the experiment, taking into account neutron backgrounds from ($\alpha$,n) and spontaneous fission reactions due to natural radioactivity in the detector and shield materials, as well as muon-induced neutrons. Based on Monte Carlo simulations and using measured radioactive contaminations of all detector components, we predict the nuclear recoil backgrounds for the WIMP search results published by the XENON100 experiment in 2011 and 2012, 0.11$^{+0.08}_{-0.04}$ events and 0.17$^{+0.12}_{-0.07}$ events, respectively, and conclude that they do not limit the sensitivity of the experiment.

Type: Article The neutron background of the XENON100 dark matter experiment An open access version is available from UCL Discovery 10.1088/0954-3899/40/11/115201 http://dx.doi.org/10.1088/0954-3899/40/11/115201 English This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. UCLUCL > Provost and Vice Provost OfficesUCL > Provost and Vice Provost Offices > UCL BEAMSUCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical SciencesUCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy https://discovery.ucl.ac.uk/id/eprint/1396116