M. Murra
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View article: Design, construction and commissioning of a high-flow radon removal system for XENONnT
Design, construction and commissioning of a high-flow radon removal system for XENONnT Open
A high-flow radon removal system based on cryogenic distillation was developed and constructed to reduce radon-induced backgrounds in liquid xenon detectors for rare event searches such as XENONnT. A continuous purification of the XENONnT …
View article: Emission of single and few electrons in XENON1T and limits on light dark matter
Emission of single and few electrons in XENON1T and limits on light dark matter Open
Delayed single- and few-electron emissions plague dual-phase time projection chambers, limiting their potential to search for light-mass dark matter. This paper examines the origins of these events in the XENON1T experiment. Characterizati…
View article: GPU-based optical simulation of the DARWIN detector
GPU-based optical simulation of the DARWIN detector Open
Understanding propagation of scintillation light is critical for maximizing the discovery potential of next-generation liquid xenon detectors that use dual-phase time projection chamber technology. This work describes a detailed optical si…
View article: Cryogenic bath-type heat exchangers for ultra-pure noble gas applications
Cryogenic bath-type heat exchangers for ultra-pure noble gas applications Open
Two cryogenic bath-type heat exchangers for ultra-pure noble gas applications were developed with particular emphasis on noble gas liquefaction in cryogenic distillation systems. The main objective was to construct heat exchangers for xeno…
View article: Application and modeling of an online distillation method to reduce krypton and argon in XENON1T
Application and modeling of an online distillation method to reduce krypton and argon in XENON1T Open
A novel online distillation technique was developed for the XENON1T dark matter experiment to reduce intrinsic background components more volatile than xenon, such as krypton or argon, while the detector was operating. The method is based …
View article: Suplemental data for material radiopurity control in the XENONnT experiment
Suplemental data for material radiopurity control in the XENONnT experiment Open
The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples hav…
View article: Suplemental data for material radiopurity control in the XENONnT experiment
Suplemental data for material radiopurity control in the XENONnT experiment Open
The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples hav…
View article: Ultra-clean radon-free four cylinder magnetically-coupled piston pump
Ultra-clean radon-free four cylinder magnetically-coupled piston pump Open
A high performance gas displacement pump based on four individual cylinders was developed. The magnetically-coupled pistons and the hermetically-sealed housings as well as the special cleanliness in terms of out-gassing and radio-purity ma…
View article: Reflectivity of VUV-sensitive silicon photomultipliers in liquid Xenon
Reflectivity of VUV-sensitive silicon photomultipliers in liquid Xenon Open
Silicon photomultipliers are regarded as a very promising technology for next-generation, cutting-edge detectors for low-background experiments in particle physics. This work presents systematic reflectivity studies of Silicon Photomultipl…
View article: Search for inelastic scattering of WIMP dark matter in XENON1T
Search for inelastic scattering of WIMP dark matter in XENON1T Open
We report the results of a search for the inelastic scattering of weakly interacting massive particles (WIMPs) in the XENON1T dark matter experiment. Scattering off 129Xe is the most sensitive probe of inelastic WIMP interactions, with a s…
View article: Excess electronic recoil events in XENON1T
Excess electronic recoil events in XENON1T Open
The XENON1T collaboration reported an excess of electronic recoil events at low energies (1–7 keV) with a significance of 3.3σ, proposing solar axions, neutrino magnetic moment, or tritium contamination as potential explanations. We presen…
View article: $^{222}$Rn emanation measurements for the XENON1T experiment
$^{222}$Rn emanation measurements for the XENON1T experiment Open
The selection of low-radioactive construction materials is of utmost importance for the success of low-energy rare event search experiments. Besides radioactive contaminants in the bulk, the emanation of radioactive radon atoms from materi…
View article: Observation of Excess Electronic Recoil Events in XENON1T
Observation of Excess Electronic Recoil Events in XENON1T Open
We report results from searches for new physics with low-energy electronic recoil data recorded with the XENON1T detector, with an exposure of 0.65 t-y and an unprecedentedly low background rate of $76 \pm 2_{stat}$ events/(t y keV) betwee…
View article: Sensitivity of the DARWIN observatory to the neutrinoless double beta decay of $^{136}$Xe
Sensitivity of the DARWIN observatory to the neutrinoless double beta decay of $^{136}$Xe Open
The DARWIN observatory is a proposed next-generation experiment to search for particle dark matter and for the neutrinoless double beta decay of $^{136}$Xe. Out of its 50$\,$t total natural xenon inventory, 40$\,$t will be the active targe…
View article: Light Dark Matter Search with Ionization Signals in XENON1T
Light Dark Matter Search with Ionization Signals in XENON1T Open
We report constraints on light dark matter (DM) models using ionization signals in the XENON1T experiment. We mitigate backgrounds with strong event selections, rather than requiring a scintillation signal, leaving an effective exposure of…
View article: Search for Light Dark Matter Interactions Enhanced by the Migdal Effect or Bremsstrahlung in XENON1T
Search for Light Dark Matter Interactions Enhanced by the Migdal Effect or Bremsstrahlung in XENON1T Open
Direct dark matter detection experiments based on a liquid xenon target are leading the search for dark matter particles with masses above ∼5 GeV/c^{2}, but have limited sensitivity to lighter masses because of the small momentum transfer …
View article: XENON1T dark matter data analysis: Signal reconstruction, calibration, and event selection
XENON1T dark matter data analysis: Signal reconstruction, calibration, and event selection Open
The XENON1T experiment at the Laboratori Nazionali del Gran Sasso is the most\nsensitive direct detection experiment for dark matter in the form of weakly\ninteracting particles (WIMPs) with masses above $6\\,$GeV/$c^2$ scattering off\nnuc…
View article: XENON1T dark matter data analysis: Signal and background models and statistical inference
XENON1T dark matter data analysis: Signal and background models and statistical inference Open
The XENON1T experiment searches for dark matter particles through their scattering off xenon atoms in a 2 metric ton liquid xenon target. The detector is a dual-phase time projection chamber, which measures simultaneously the scintillation…
View article: Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T
Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T Open
We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from the XENON1T dark matter search experiment. The analysis uses the full ton year exposure of XENON1T to con…
View article: First Results on the Scalar WIMP-Pion Coupling, Using the XENON1T Experiment
First Results on the Scalar WIMP-Pion Coupling, Using the XENON1T Experiment Open
We present first results on the scalar coupling of weakly interacting massive particles (WIMPs) to pions from 1 t yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged b…
View article: Dark Matter Search Results from a One Ton-Year Exposure of XENON1T
Dark Matter Search Results from a One Ton-Year Exposure of XENON1T Open
We report on a search for weakly interacting massive particles (WIMPs) using 278.8 days of data collected with the XENON1T experiment at LNGS. XENON1T utilizes a liquid xenon time projection chamber with a fiducial mass of (1.30±0.01) ton,…
View article: Signal yields of keV electronic recoils and their discrimination from nuclear recoils in liquid xenon
Signal yields of keV electronic recoils and their discrimination from nuclear recoils in liquid xenon Open
We report on the response of liquid xenon to low energy electronic recoils\nbelow 15 keV from beta decays of tritium at drift fields of 92 V/cm, 154 V/cm\nand 366 V/cm using the XENON100 detector. A data-to-simulation fitting method\nbased…