Volume 402 - The 22nd International Workshop on Neutrinos from Accelerators (NuFact2021) - All Sessions
Recent results of the DANSS experiment
I.G. Alekseev* and N. Skrobova
Full text: pdf
Published on: March 31, 2022
Abstract
We present the new results of the DANSS experiment on the searches for sterile neutrinos.
The results are based on approximately 5.5 million of inverse beta decay (IBD) events collected
during 5 years at 10.9, 11.9 and 12.9 meters
from the reactor core of the 3.1 GW$_\mathrm{th}$ Kalininskaya Nuclear Power Plant in Russia. In the closest
position to the reactor core more than 5000 IBD events per day are collected with the signal to background ratio above 50.
The best fit with $4\nu$ hypothesis corresponds to $\Delta m^2 = 1.3$ eV$^2$ and $\sin^2{2\theta} = 0.014$. It has
$\Delta\chi^2=-3.2$, which corresponds to less than $1.3\sigma$ effect. This means that no statistically
significant evidence of oscillations observed so far. An exclusion region was calculated using the Gaussian CLs
method and reaches $\sin^2{2\theta} = 0.008$ around $\Delta m^2 = 0.9$ eV$^2$ at the 90% confidence level.
We have also measured the reactor power using the IBD event rate during 4.5 years with the average
statistical accuracy 1.9% in 2 days and with the relative systematic uncertainty below 0.5%. Plans for the
DANSS upgrade are presented also. The upgrade should allow DANSS to test the Neutrino-4 claim of observation of sterile neutrinos.
DOI: https://doi.org/10.22323/1.402.0143
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