Past Reactor Experiments (Some Lessons From History) Stuart Freedman University of California at Berkeley and Lawrence Berkeley National Laboratory Workshop on the feasibility study of the Daya Bay reactor neutrino experiment Jan. 17-18, 2004 in IHEP, Beijing
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Past Reactor Experiments (Some Lessons From History) Stuart Freedman University of California at Berkeley and Lawrence Berkeley National Laboratory Workshop.
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Past Reactor Experiments(Some Lessons From History)
Stuart FreedmanUniversity of California at Berkeley
andLawrence Berkeley National Laboratory
Workshop on the feasibility study of
the Daya Bay reactor neutrino experiment
Jan. 17-18, 2004 in IHEP, Beijing
Enrico Fermi
Inverse Beta Decay Cross Section and Spectrum
The first proposal for a neutrino experiment didn’t use a reactor
Poltergeist: the largest scintillator in the world
Neutrino Spectra from Principal Reactor Isotopes
235U fission
First Direct Detection of the Neutrino
νe +p→ e+ +n
Backgrounds!
Poltergeist1m
KamLAND20 m
Chooz4 m
Long Baseline Reactor Neutrino Experiments
Correlated Backgrounds from External Neutrons
Palo Verde
Spallation Produced Radio-Isotopes in Liquid Scintillator
Isotope t1/2 Emax
(MeV)Background
- 12B 0.02 s 13.4 Uncorrelated11Be 13.80 s 11.5 Uncorrelated11Li 0.09 s 20.8 Correlated9Li 0.18 s 13.6 Correlated8Li 0.84 s 16.0 Uncorrelated
8He 0.12 s 10.6 Correlated6He 0.81 s 3.5 Uncorrelated
+, EC 11C 20.38 m 0.96 Uncorrelated10C 19.30 s 1.9 Uncorrelated9C 0.13 s 16.0 Uncorrelated8B 0.77 s 13.7 Uncorrelated
%Total LS mass 2.1Fiducial mass ratio 4.1Energy threshold 2.1Tagging efficiency 2.1Live time 0.07Reactor power 2.0Fuel composition 1.0Time lag 0.28e spectra 2.5
Cross section 0.2
Total uncertainty 6.4 %
Systematic Uncertainties
E > 2.6 MeV
ReactorDetector 1Detector 2
d2
d1
Experimental Design
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