Latest results of the DANSS experiment

23 Oct 2023, 17:05
15m
Oral Presentation NEUTRINO PHYSICS AND DARK MATTER SEARCHES Neutrino Physics and Dark Matter Searches

Speaker

Nataliya Skrobova (LPI RAS)

Description

The latest results of the DANSS experiment are presented. DANSS is a one cubic meter highly segmented solid scintillator detector. It consists of 2500 scintillator strips, covered with gadolinium loaded reflective coating and read out with SiPMs and PMTs via wavelength shifting fibers. DANSS is placed under a 3.1 GW industrial reactor at the Kalinin NPP (Russia) on a movable platform. The distance from the reactor core center is varied from 10.9 m to 12.9 m on-line. The inverse beta decay (IBD) process is used to detect antineutrinos. DANSS detects about 5000 IBD events per day with the background from cosmic muons at the level of few percent.
The total number of the detected antineutrino events has reached 7M with about 1.5M new events in excess of the one year old data. New limits on the sterile neutrino oscillation parameters will be presented. The evolution of the antineutrino counting rate and spectrum with the time of the reactor campaign will also be discussed. An analysis of the data, including the absolute antineutrino flux with conservative estimation of systematic uncertainties, excludes nearly the whole area of the sterile neutrino parameters, preferred by the recent BEST results, and also the best fit point of the Neutrino-4 experiment.
The status of the coming DANSS modernization will be presented. This upgrade will
improve DANSS energy resolution and increase the sensitive volume, which will allow covering of even larger area of the sterile neutrino parameters. The sensitivity of the upgraded DANSS detector will allow to check the latest BEST and Neutrino-4 results in a model-independent way.

Primary author

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