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Zara Bagdasarian (UCB) “Solar Neutrinos with Borexino: First Evidence of CNO Fusion Cycle”

July 16, 2020 @ 4:00 pm - 5:00 pm

The prime energy producer in the sun is the fusion of hydrogen to form
helium. However, there is more than one way for this fusion to take
place: for stars the size of the sun or smaller, the proton-proton (pp)
chain reactions dominate (~99%), while in heavier stars, the
carbon-nitrogen-oxygen (CNO) cycle is expected to play a more important
role. Not only these fusion reactions would not have been possible
without the emission of neutrinos, neutrinos are the only way to
directly access the processes in the core of the sun.

Borexino experiment, located at the Laboratori Nazionali del Gran Sasso,
was built with a primary goal of the Be7 solar neutrinos (part of pp
chain) detection. In more than a decade of data taking, Borexino has not
only demonstrated the unprecedentedly high sensitivity towards Be7 solar
neutrinos (<3%) but performed a comprehensive study of low-energy
neutrinos from the complete pp-chain. After a number of developments in
both hardware and software, Borexino presents the first experimental
evidence of the up-to-now elusive CNO fusion cycle in the Sun. The
absence of the CNO neutrinos signal is disfavoured by the Borexino
experiment at 5σ.

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Meeting ID: 917 8226 8585



July 16, 2020
4:00 pm - 5:00 pm


Zoom Talk
Berkeley, ca 94720
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