Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 77, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-017-5223-9
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Funding
- SCOAP3
- Science and Technology Facilities Council [ST/N000447/1] Funding Source: researchfish
- STFC [ST/N000447/1] Funding Source: UKRI
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Models for light dark matter particles with masses below 1GeV/c(2) are a natural and well-motivated alternative to so-far unobserved weakly interacting massive particles. Gram-scale cryogenic calorimeters provide the required detector performance to detect these particles and extend the direct dark matter search program of CRESST. A prototype 0.5 g sapphire detector developed for the nu-cleus experiment has achieved an energy threshold of E-th = (19.7 +/- 0.9) eV. This is one order of magnitude lower than for previous devices and independent of the type of particle interaction. The result presented here is obtained in a setup above ground without significant shielding against ambient and cosmogenic radiation. Although operated in a high-background environment, the detector probes a new range of light-mass dark matter particles previously not accessible by direct searches. We report the first limit on the spin-independent dark matter particle-nucleon cross section for masses between 140 and 500 MeV/c(2).
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