The Sudbury Neutrino Observatory: Observation of flavor change for solar neutrinos

2016 ◽  
Vol 528 (6) ◽  
pp. 469-480 ◽  
Author(s):  
Arthur B. McDonald
Keyword(s):  
Solar Neutrinos ◽  
Sudbury Neutrino Observatory ◽  
Flavor Change

RESULTS FROM THE PURE D2O PHASE OF THE SUDBURY NEUTRINO OBSERVATORY

2003 ◽  
Vol 18 (22) ◽  
pp. 3789-3807
Author(s):  
◽  
F. A. DUNCAN
Keyword(s):  
Neutral Current ◽  
Solar Neutrinos ◽  
Total Flux ◽  
Sudbury Neutrino Observatory ◽  
Charged Current ◽  
Mixing Angle ◽  
Cerenkov Detector ◽  
Neutrino Spectrum ◽  
Oscillation Analysis ◽  
Current Interaction

The Sudbury Neutrino Observatory is a 1000 T D2O Cerenkov detector that is sensitive to 8 B and hep solar neutrinos. Both Charged Current and Neutral Current interaction rates on deuterons as well as the Elastic Scattering interaction rate on electrons can be measured simultaneously. Assuming an undistorted 8 B neutrino spectrum, the total flux measured with the NC reaction is [Formula: see text], which is consistent with solar models. The νe component of the 8 B solar flux is [Formula: see text] for a kinetic energy threshold of 5 MeV. The non-νe component is [Formula: see text], which is 5.3σ greater than zero, giving strong evidence for solar νe flavor transformation. The Day-Night Asymmetry for the Charged Current interaction is [Formula: see text]. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the νe asymmetry is found to be [Formula: see text]. Combined with other solar neutrino data, a global MSW oscillation analysis strongly favors the Large Mixing Angle (LMA) solution.

scholarly journals Deuteron disintegration by reactor antineutrinos

2021 ◽  
Author(s):  
L. M. Slad
Keyword(s):  
Solar Neutrinos ◽  
Electron Neutrino ◽  
Experimental Results ◽  
Sudbury Neutrino Observatory ◽  
Neutral Currents ◽  
Reactor Neutrinos ◽  
Special Studies ◽  
Good Agreement ◽  
Registration Efficiency

The existence of a new interaction involving the electron neutrino and the nucleons, which has received a convincing confirmation through a good agreement between the theoretical and experimental results concerning all observable processes with solar neutrinos, should also inevitably manifest itself in the deuteron disintegration by the neutral currents of reactor antineutrinos. The special attention is drawn to the problem of finding the neutron registration efficiency, discussed in the preparation of the experiment at the Sudbury Neutrino Observatory and in a number of special studies. Lessons are noted that can be learned from three long-standing experiments on the deuteron disintegration by reactor neutrinos.

A NATIONAL UNDERGROUND SCIENCE AND ENGINEERING LABORATORY

2003 ◽  
Vol 18 (22) ◽  
pp. 4129-4133
Author(s):  
THOMAS J. BOWLES
Keyword(s):  
United States ◽  
Particle Physics ◽  
The United States ◽  
Solar Neutrinos ◽  
Sudbury Neutrino Observatory ◽  
Atmospheric Neutrinos ◽  
Concerted Effort ◽  
Science And Engineering ◽  
Reactor Neutrinos ◽  
Made In

Dramatic progress has been made in the last several years in our understanding of the properties of neutrinos with evidence for neutrino flavor transformation coming from measurements of atmospheric neutrinos by SuperKamiokande, of solar neutrinos by the Sudbury Neutrino Observatory (SNO), and of reactor neutrinos by KamLAND. These results are a step in the ongoing program of science that is carried out in underground laboratories. The potential for additional significant discoveries with new capabilities in underground laboratories exists and should be exploited. Discoveries are likely to be made not only in nuclear and particle physics, but also in astrophysics, geophysics, and geobiology. A concerted effort is now underway in the United States to create a National Underground Science and Engineering Laboratory (NUSEL) that would provide the facilities and infrastructure necessary to capitalize on the opportunities presented by underground science.

Measurement of the Rate of ve + d→p + p + e- Interactions Produced by 8B Solar Neutrinos at the Sudbury Neutrino Observatory

2018 ◽  
pp. 451-456
Author(s):  
John N. Bahcall ◽  
Raymond Davis ◽  
Peter Parker ◽  
Alexei Smirnov ◽  
Roger Ulrich
Keyword(s):  
Solar Neutrinos ◽  
Sudbury Neutrino Observatory

Solar-neutrino neutral-current detection methods in the Sudbury neutrino observatory

1991 ◽  
Vol 69 (11) ◽  
pp. 1309-1316 ◽  
Author(s):  
C. K. Hargrove ◽  
D. J. Paterson
Keyword(s):  
Heavy Water ◽  
Solar Neutrino ◽  
Neutral Current ◽  
Solar Neutrinos ◽  
Light Nuclei ◽  
Detection Methods ◽  
Sudbury Neutrino Observatory ◽  
Original Design ◽  
Γ Rays ◽  
Current Detection

The Sudbury Neutrino Observatory will study the solar-neutrino problem through the detection of charged-current (CC), neutral-current (NC), and elastic-scattering (ES) interactions of solar neutrinos with heavy water. The measurement of the NC rate relative to the CC rate provides a nearly model-independent method of observing neutrino oscillations. The NC interaction breaks up the deuteron producing a neutron and a proton. The interaction rate in the original design is measured by observing Čerenkov light from showers produced by neutron-capture γ rays from the capture of the NC neutrons by a selected additive to the heavy water. These signals overlap the CC and ES signals, so that the measurement of the NC rate requires the subtraction of two signals obtained at different times. This paper describes our investigation of an alternate detection method in which the thermalized neutrons are captured by (n, α) or (n, p) reactions on light nuclei. The resulting charged-particle products are uniquely detected by scintillators or proportional counters, completely separating this NC signal from the CC and ES Čerenkov signals, thus simplifying its measurement, improving its significance, and allowing observation of otherwise unobservable short-term NC fluctuations. Although background rates for the new techniques have not yet been determined, the experimental advantages justify further development work.

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