The researchers based in Gran Sasso National Laboratory near L’Aquila, Italy, about 1 kilometer into the ground, were able, even in 2007 to detect some of the neutrinos from the Sun, essentially confirming that the theorized fusion reactions, which include the presence of berilium, are correct.
Science20 reported at that time about Sun’s neutrino heart beat. The researchers were able to detect low level neutrinos in the range of 0.862 MeV. They used the Borexino detector to get a glimpse into the universe of these tiny neutrinos.
Sun’s neutrino heartbeats are about 2-3 pe hour. Watch the timer in the video from above.