Borexino claims to detect solar neutrinos

[dren]

https://physicsworld.com/a/borexino-spo ... ion-cycle/

The data in this study were acquired during phase-III of the Borexino experiment, which ran for over 1000 h in July 2016–February 2020. Because the CNO signal is very weak, the researchers had to account for background from two low-level impurities – bismuth-210 and carbon-11 – that can mimic the signal expected from CNO neutrinos. The team also had to account for neutrinos created by the proton–electron–proton process in the Sun, which can also be mistaken for CNO neutrinos.

[Michael Mozina]

https://arxiv.org/abs/astro-ph/0512633

Oliver Manual, Hilton Ratcliffe and myself wrote a paper in 2005, which would ultimately predict that if our theory is correct, the number of such neutrinos should increase with high energy solar flare activity, essentially "electrical discharges" in the solar atmosphere.

[Michael Mozina]

I'm curious to understand how they're embracing neutrino oscillation models while selectively picking out CNO patterns from P-P patterns.

[Higgsy]

I'm curious to understand how they're embracing neutrino oscillation models while selectively picking out CNO patterns from P-P patterns.

They pick out an excess of neutrinos near the peak of the CNO energy (well, 13N and 15O neutrinos), when the neutrinos with the spectra of the other sources and noise from residual radioactivity is subtracted out. The electron neutrino survival rate for MSW conversion as a function of energy for day and night is well known so that's how oscillations are taken care of. That's a routine process, not just here, but in considering neutrinos from other sources (pp, pep, 8B and so on).