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First Measurement of CNO solar neutrinos with Borexino
by
Xuefeng Ding
(Gran Sasso Science Institute(INFN), L＼'Aquila, Italy)
→
Asia/Shanghai
Description
Borexino recently announced the first measurement of solar neutrinos from the CNO cycle process. The carbon-nitrogen-oxygen (CNO) cycle is one of two known sets of fusion reactions by which stars convert hydrogen to helium. It is thought to be more important in stars more massive than 1.3 solar mass or in late stages. Proposed as early as 1930s by H. Bethe, it remains hypothetical until this work.
Located at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, Borexino is a liquid scintillator detector that detects solar neutrinos by their elastic scattering on electrons. Most of the natural radioactive isotope backgrounds were removed during the purification campaign. Cosmogenic backgrounds, especially 11C, are low thanks also to the 3800-meter water equivalent of overburden and the three-fold coincidence analysis technique. The remaining backgrounds for measurement of CNO solar neutrinos are pep solar neutrinos and radioactive 210Bi. With two breakthroughs in the thermal stability of the detector and in the analysis method, the 210Bi rate could be determined precisely and accurately for the CNO neutrino analysis. Finally, the absence of CNO solar neutrinos is disfavored at 5 sigma significance, and the flux of CNO solar neutrinos is determined to be 7.0+3.0-2.0 x 10^8 cm-2s-1.
About the speaker:
Xuefeng Ding is currently a postdoctoral researcher at Princeton University. He obtained his PhD degree from SISSA (International School for Advanced Studies) and GSSI (Gran Sasso Science Insitute) from Italy. During his PhD, he studied the potentiality of the JUNO detector in detection of solar neutrinos, accomplished as the major contributor of the multivariate fit analysis of the Borexino Phase-II data, and developed the GPU accelerated multivariate fitting software GooStats. After PhD, he continued working in Borexino and switched to the CNO solar neutrino analysis. His interest lies in solar neutrino physics and high performance computing.
Tencent Meeting ID: 906 413 941 or click https://meeting.tencent.com/s/4YkQRzcl1RJm
