AWhat changed
Borexino extracted a low-energy solar proton–proton neutrino signal from electron recoils. A later collaboration account reports 144 ± 13 statistical ± 10 systematic interactions per day per 100 tonnes, and a derived pp neutrino flux of (6.6 ± 0.7) × 10¹⁰ cm⁻² s⁻¹.
Scientific scope
Borexino extracted a low-energy solar proton–proton neutrino signal from electron recoils. A later collaboration account reports 144 ± 13 statistical ± 10 systematic interactions per day per 100 tonnes, and a derived pp neutrino flux of (6.6 ± 0.7) × 10¹⁰ cm⁻² s⁻¹. The 408 live days span January 2012 to May 2013. The statistical spectral fit depends on detector response and radioactive and pileup backgrounds, with other solar-neutrino components constrained; conversion from interaction rate to total flux uses neutrino-flavor survival and scattering assumptions. The summary uses a 2015 collaboration report about the 2014 result; it does not include an independent raw-data reanalysis.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The 408 live days span January 2012 to May 2013. The statistical spectral fit depends on detector response and radioactive and pileup backgrounds, with other solar-neutrino components constrained; conversion from interaction rate to total flux uses neutrino-flavor survival and scattering assumptions. The summary uses a 2015 collaboration report about the 2014 result; it does not include an independent raw-data reanalysis.
Contributors
- The named authors in the research record · SCIENCE: Credit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred.
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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