Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 42 of 237
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2.4 Experimental evidence
[-- Gallium K- Chlorine I-* SuperK
0.2 0.5 1 2 5
Neutrino energy (MeV)
Figure 2.7: The solar neutrino fluxes and energy spectra predicted by the SSM. The figure
is taken from . The colour scheme corresponds to the energies studied in the three
different types of experiments shown at the top.
the lower flux measurement using 71Ga. The neutrino reaction studied was:
ve + 71Ga -, C + 71Ge
which has an end point of 223 keV. This lower end point makes it possible to study neutrinos
coming from 7Be and pp neutrinos. Both the experimental results, GALLEX in 1992 [33,
34] and SAGE in 1991 [35, 36], show that nearly half of the expected electron neutrinos
are missing. The GALLEX experiment was upgraded to become the GNO experiment,
confirming the same results .
Cerenkov detector experiments
While the SAGE and GALLEX radiochemical experiments were sensitive to lower energy
neutrinos, a Cerenkov detector experiment, Kamiokande, was taking data coming from the
8B neutrinos. Note that, even though the flux of 'B is lower than the flux of pp neutrinos,
the cross-section for neutrino interactions is proportional to the neutrino energy, making
possible the detection of neutrinos from 8B. The experiment is not sensitive to lower energy
I I I I . . . I
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Tinti, Gemma Maria & U., /Oxford. Sterile neutrino oscillations in MINOS and hadron production in pC collisions, thesis or dissertation, July 1, 2010; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1015233/m1/42/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.