talk - International Workshop on Double Beta Decay and Neutrino

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1. Scientifically desirable pep and CNO solar neutrinos ? + pep rate is closely connected with pp rate (low energy, mostly obscured by 14 C), first fusion step in the sun + CNO flux has large theoretical uncertainty (30%) depending on unknown factors of the solar chemical composition (metallicity of the mantle) 2. Hard to detect + the expected pep and CNO solar neutrino rates are 5-10 times smaller than 7 Be, which obscures most of their spectrum + 210 Bi, 40 K and 208 Tl ( 232 Th) backgrounds Counts/(10 keV x day x 100 tons) 5 10 4 10 3 10 2 10 10 1 -1 10 -2 10 -3 10 Tuesday, May 27, 2008 New Results:192 Days 200 400 600 800 1000 1200 1400 1600 1800 2000 Energy [keV] 3. 11 C subtraction Fit: ! 2 /NDF = 185/174 7 Be: 49±3 cpd/100 tons 210 Bi+CNO: 23±2 cpd/100 tons 85 Kr: 25±3 cpd/100 tons 11 C: 25±1 cpd/100 tons 14 C 10 C CNO, pep + when a muon produces a 11 C, simulations suggest that a free neutron is also emitted ~95% of the times, allowing for event-byevent subtraction + investigating statistical subtraction Andrea Pocar - DBD11 - November 15, 2011 24 25
pep and CNO neutrinos The 125 muon-‐neutron coincidences/day can be vetoed without excessive loss of live
Page 1 and 2: Latest results from Borexino DBD11
Page 3 and 4: Solar Fusion Reactions p-p Solar Fu
Page 5 and 6: neutrino oscillations solar, atmosp
Page 7 and 8: Gran Sasso Perugia Heidelberg Hambu
Page 9 and 10: Borexino L’AQUILA Tunnel of 10.
Page 11 and 12: measurement of the 7 Be solar neutr
Page 13 and 14: detector calibrations 4 campaigns i
Page 15 and 16: data reduction and signal extractio
Page 17 and 18: spectral fits • Different fits: -
Page 19 and 20: Implication on solar physics • Me
Page 21 and 22: no day/night effect matter effects
Page 23: 8 B solar neutrinos at low threshol
Page 27 and 28: μ Track three-fold coincidence And
Page 29 and 30: μ Track three-fold coincidence n C
Page 31 and 32: 3-fold coincidence results (not onl
Page 33 and 34: electron/positron pulse shape discr
Page 35 and 36: pep and CNO results Borexino pep
Page 37 and 38: Andrea Pocar Pocar - DBD11 - SiLAFA

talk - International Workshop on Double Beta Decay and Neutrino

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