| the decay of is used to cross check the absolute energy scale calibration for solar neutrinos established by the electron linear accelerator ( linac ) . a deuterium - tritium neutron generator was employed to create via the ( n , p ) reaction on in the water of the detector . this technique is isotropic and has different systematic uncertainties than the linac . the results from this high statistics data sample agree with the absolute energy scale of the linac to better than 1% . a natural source of from the capture of @xmath0 on , which is collected as a background to the solar neutrino analysis , is also discussed . , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , solar neutrinos ; calibration ; super - kamiokande + pacs : 26.65.+t |