Publications by authors named "J Aalbers"

97 Publications

Rn  emanation measurements for the XENON1T experiment.

Eur Phys J C Part Fields 2021 20;81(4):337. Epub 2021 Apr 20.

Nikhef and the University of Amsterdam, Science Park, 1098 XG Amsterdam, The Netherlands.

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 material surfaces attains increasing relevance in the effort to further reduce the background of such experiments. In this work, we present the Rn emanation measurements performed for the XENON1T dark matter experiment. Together with the bulk impurity screening campaign, the results enabled us to select the radio-purest construction materials, targeting a Rn activity concentration of in of xenon. The knowledge of the distribution of the Rn sources allowed us to selectively eliminate problematic components in the course of the experiment. The predictions from the emanation measurements were compared to data of the Rn activity concentration in XENON1T. The final Rn activity concentration of in the target of XENON1T is the lowest ever achieved in a xenon dark matter experiment.
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http://dx.doi.org/10.1140/epjc/s10052-020-08777-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8550029PMC
April 2021

Search for Coherent Elastic Scattering of Solar ^{8}B Neutrinos in the XENON1T Dark Matter Experiment.

Phys Rev Lett 2021 Mar;126(9):091301

Institute for Astroparticle Physics, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.

We report on a search for nuclear recoil signals from solar ^{8}B neutrinos elastically scattering off xenon nuclei in XENON1T data, lowering the energy threshold from 2.6 to 1.6  keV. We develop a variety of novel techniques to limit the resulting increase in backgrounds near the threshold. No significant ^{8}B neutrinolike excess is found in an exposure of 0.6  t×y. For the first time, we use the nondetection of solar neutrinos to constrain the light yield from 1-2 keV nuclear recoils in liquid xenon, as well as nonstandard neutrino-quark interactions. Finally, we improve upon world-leading constraints on dark matter-nucleus interactions for dark matter masses between 3 and 11  GeV c^{-2} by as much as an order of magnitude.
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http://dx.doi.org/10.1103/PhysRevLett.126.091301DOI Listing
March 2021

Search for Light Dark Matter Interactions Enhanced by the Migdal Effect or Bremsstrahlung in XENON1T.

Phys Rev Lett 2019 Dec;123(24):241803

Physics Department, Columbia University, New York, New York 10027, USA.

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 in dark matter-nucleus elastic scattering. However, there is an irreducible contribution from inelastic processes accompanying the elastic scattering, which leads to the excitation and ionization of the recoiling atom (the Migdal effect) or the emission of a bremsstrahlung photon. In this Letter, we report on a probe of low-mass dark matter with masses down to about 85  MeV/c^{2} by looking for electronic recoils induced by the Migdal effect and bremsstrahlung using data from the XENON1T experiment. Besides the approach of detecting both scintillation and ionization signals, we exploit an approach that uses ionization signals only, which allows for a lower detection threshold. This analysis significantly enhances the sensitivity of XENON1T to light dark matter previously beyond its reach.
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http://dx.doi.org/10.1103/PhysRevLett.123.241803DOI Listing
December 2019

Light Dark Matter Search with Ionization Signals in XENON1T.

Phys Rev Lett 2019 Dec;123(25):251801

Physics Department, Columbia University, New York, New York 10027, USA.

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 (22±3) tonne day. Above ∼0.4  keV_{ee}, we observe <1  event/(tonne day keV_{ee}), which is more than 1000 times lower than in similar searches with other detectors. Despite observing a higher rate at lower energies, no DM or CEvNS detection may be claimed because we cannot model all of our backgrounds. We thus exclude new regions in the parameter spaces for DM-nucleus scattering for DM masses m_{χ} within 3-6  GeV/c^{2}, DM-electron scattering for m_{χ}>30  MeV/c^{2}, and absorption of dark photons and axionlike particles for m_{χ} within 0.186-1  keV/c^{2}.
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http://dx.doi.org/10.1103/PhysRevLett.123.251801DOI Listing
December 2019

Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T.

Phys Rev Lett 2019 Apr;122(14):141301

Department of Physics and Astronomy, University of Bologna and INFN-Bologna, 40126 Bologna, Italy.

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 constrain the spin-dependent proton-only and neutron-only cases. No significant signal excess is observed, and a profile likelihood ratio analysis is used to set exclusion limits on the WIMP-nucleon interactions. This includes the most stringent constraint to date on the WIMP-neutron cross section, with a minimum of 6.3×10^{-42}  cm^{2} at 30  GeV/c^{2} and 90% confidence level. The results are compared with those from collider searches and used to exclude new parameter space in an isoscalar theory with an axial-vector mediator.
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http://dx.doi.org/10.1103/PhysRevLett.122.141301DOI Listing
April 2019
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