Speaker
Description
Recently the first direct observation of CNO neutrinos was achieved with a high statistical significance. This challending observation was made using the highly radiopure liquid-scintillator detector Borexino located in the Laboratori Nazionali del Gran Sasso in Italy. The spectral shape of CNO neutrino interactions in the liquid scintillator of the Borexino detector is very similar to that of the main background: intrinsic 210Bi decays. The ensuing high correlations in Borexino's spectral fits make an independent determination of a 210Bi constraint necessary in order to claim a measurement or discovery of CNO neutrinos. In this talk the methods used to extract the 210Bi rate from 210Po data, selected with pulse shape discrimination methods, are discussed, as well as how systematic uncertainties were treated.
| Collaboration name | Borexino |
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