E. V. Turbin

Antineutrino-deuteron experiment at the Krasnoyarsk reactor

This report is represented the results of some experiments, which carried out at the neutrino underground laboratory of Kranoyarsk nuclear plant.The investigation of antineutrino interaction with matter at the Krasnoyarsk reactor is described. The characteristics of the “Deuteron” detector, the results obtained, and prospects are discussed.

Today and future neutrino experiments at Krasnoyarsk nuclear reactor

The results of undergoing experiments and new experiment propositions at Krasnoyarsk underground nuclear reactor are presentedAbstract The results of undergoing experiments and new experiment propositions at Krasnoyarsk underground nuclear reactor are presented.

Large seasonal variations and anomalous absorption curves of the high-ionization cosmic ray component obtained at the Doch-4M spectrometric scintillation telescope

Cosmic ray absorption curves and seasonal variations were measured at the Doch-4M spectrometric scintillation telescope over its service period (2001–2008) in order to study the nature of the high-ionization cosmic ray component. Large seasonal variations (A ≈ 30%) in cosmic rays, practically independent of the zenith angle of the Doch-4M telescope axis inclination, were observed for the first time. The anomalous results obtained both for the seasonal variations and for the absorption range of the high-ionization cosmic ray component in various materials of lead and polyethylene, which are in conflict with the absorption of the hadron cosmic ray component, were explained within the erzion model.

Neutrino-induced deuteron disintegration in an experiment at the Krasnoyarsk nuclear reactor

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%: σexptNCD=(3.35±0.31)×10−44 cm2/fission 235U, σexptNCD=(1.08±0.09)×10−44 cm2/fission 235U, and σexptNCD=(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: Δm2≤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 ann(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: GANC=GACC/0.932±0.056.

A neutrino-induced Deuteron Disintegration Experiment at the Krasnoyarsk Nuclear Reactor

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: Δm2≤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 ann(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.