Scientists at the University of Massachusetts Amherst now report new results from Borexino, one of the most sensitive neutrino detectors on the planet, located deep beneath Italy's Apennine Mountains. About 99 percent of the Sun's energy emitted as neutrinos is produced through nuclear reaction sequences initiated by proton-proton (pp) fusion in which hydrogen is converted into helium. Neutrinos emitted by this chain represent a unique tool for solar and neutrino physics.
The researchers explain that what's new today is incremental, it's not a leap, but it is the crowning of more than ten years of data-taking with the experiment to show the full energy spectrum of the Sun at once. Once you have more precise data, you can feed it back into the model of how the Sun is behaving, then the model can be refined even more. It all leads to understanding our star better. Neutrinos have told us how the Sun is burning and, in turn, the Sun has provided us with a unique source to study how neutrinos behave.
The Borexino instrument detects neutrinos as they interact with the electrons of an ultra-pure organic liquid scintillator at the centre of a large sphere surrounded by 1,000 tons of water. Its great depth and many onion-like protective layers maintain the core as the most radiation-free medium on the planet. It is the only detector on Earth capable of observing the entire spectrum of solar neutrino simultaneously, which has now been accomplished.
To read the full article, follow this link: https://phys.org/news/2018-10-snapshot-spectrum-neutrinos-emitted-sun.html