Related Experiment Video
Updated: Feb 5, 2026

Measuring the 50% Haemolytic Complement CH50 Activity of Serum
Published on: March 29, 2010
Low-Mass Dark Matter Search with the DarkSide-50 Experiment
P Agnes1, I F M Albuquerque2, T Alexander3
1Department of Physics, University of Houston, Houston, Texas 77204, USA.
Abstract:
We present the results of a search for dark matter weakly interacting massive particles (WIMPs) in the mass range below 20 GeV/c^{2} using a target of low-radioactivity argon with a 6786.0 kg d exposure. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso. The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at 0.1 keVee. The observed rate in the detector at 0.5 keVee is about 1.5 event/keVee/kg/d and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above 1.8 GeV/c^{2} for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range 1.8-6 GeV/c^{2}.
Related Concept Videos
Classifying Matter by State
The Atomic Theory of Matter
Classifying Matter by Composition
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...
Physical and Chemical Properties of Matter
What is Matter?
States of Matter
Scientists have discovered a fourth state of matter, plasma, that occurs naturally in the interiors...

