HYBRID Meeting: Neutrino University/Summer Lecture Series – Solar Neutrinos & Recent Results from Borexino

  • July 7, 2022, 1:00 pm US/Central
  • Hornets' Nest

Prof. Andrea Pocar from the University of Massachusetts at Amherst, who will talk about “The Borexino legacy: from the solar neutrino puzzle to the detection of CNO solar neutrinos”. Please join us this Thursday, July 7, at 1pm CT.

Abstract:
Borexino is a large solar neutrino detector that has operated at the Laboratori Nazionali del Gran Sasso between May 2007 and October 2021. Neutrinos are detected via their interaction with the electrons of a 300-ton liquid scintillator target, purified to achieve unprecedented levels of radio-purity. Borexino has detected with refined precision most of the components of the solar neutrino spectrum, including those from the entire pp fusion chain in the Sun, using analysis tools that fully exploit our understanding of the detector. In 2020, Borexino has made the first measurement of solar CNO neutrinos, produced in a catalytic hydrogen fusion cycle enabled by the presence in the solar plasma of heavier elements, or “metals”. This observation, improved in 2022, caps almost 15 years of Borexino science and provides experimental confirmation for the pioneering solar modeling by Hans Bethe dating back to the 1930s. The Borexino data analysis and background modeling continue to be refined to fully exploit the entire data set. Most recently, solar neutrinos were used to demonstrate that directional information can be extracted from MeV-scale electron recoils in liquid scintillator and to measure the Earth’s orbital parameters around the Sun.

This talk will present the technical and scientific legacy of Borexino and the precision solar neutrino measurements it has enabled in light of some of the key questions in neutrino physics during its lifetime. The latest measurements of Borexino and an outlook on its final science output will also discussed.