Abstract
The results of studying antineutrino interactions with deuterons (CCD and NCD reactions) and hydrogen (CCP) at the Krasnoyarsk underground reactor with the Deuteron detector are presented. The cross sections for NCD and CCD were measured with a precision of 9%. For CCP, the precision is 3%: σ expt NCD =(3.35±0.31)×10−44 cm2/fission 235U, σ expt NCD =(1.08±0.09)×10−44 cm2/fission 235U, and σ expt NCD =(6.39±0.19)×10−43 cm2/fission 235U. The precision of the experimental results is close to the theoretical one and is in good agreement with other experiments. The limit on the parameters of antineutrino oscillations into the sterile state was obtained: Δm 2≤4.7×10−2 eV2 for sin2(2ϑ)=1.0 (68% C.L.). A comparison of the measured and theoretical cross section gives us the neutron-neutron scattering length of a nn(S)=−17±6 fm in the approach of zero momentum transfers. The weak neutral current constant is in good agreement with the prediction of the Standard Model: G A NC =G A CC /0.932±0.056.
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