Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 62 of 237
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3.2 The NuMI neutrino beam
released on the antineutrino oscillation parameters : 231 = 3.36Ij x 0- eV2
and sin2 20 = 0.86 + 0.11. Increased statistics are necessary to understand if antineutrino
oscillation parameters are different from the neutrino ones.
The other contribution that MINOS can give to the neutrino studies is a limit on 013
obtained from v, appearance at the Far Detector through the subdominant oscillations
v, -- v,. The limit set by MINOS on 013 have been shown in section 2.4.3.
MINOS can study sterile neutrino limits by analysing the neutral current selected spec-
trum, which is unchanged by oscillations among active neutrinos. Results have been pub-
lished in , with the fraction of v1, which can convert into a sterile neutrinos limited to
be 50% at 90% C.L. This thesis analyses sterile neutrino mixing with Am143 ~ 0(1 eV2)
according to the model explained in section 2.3.4, with increased statistics compared to the
published article (from 3.18 x 1020 to 7 x 1020 protons on target) and improved techniques.
Figure 3.2 shows the 90% C.L. contours from  obtained for angle parameters in the
Apart from the beam neutrino oscillations, MINOS has studied neutrino oscillations 
with neutrinos coming from the atmosphere and cosmic ray fluxes [84, 85] exploiting the
underground location and the magnetisation of the detectors. The Near Detector can be
used for neutrino cross section measurements .
3.2 The NuMI neutrino beam
The Neutrinos at the Main Injector (NuMI) beamline is located at Fermilab and produces
primarily v, from a primary proton beam colliding on a target. Protons of 120 GeV/c
momentum are extracted from the Main Injector in 10 ps spills. As the Main Injector
accepts batches of protons to accelerate from the Booster, neutrinos will show a time
distribution in batches as well. The typical intensity of the proton beam is 2.1x 1013 protons
on target with a cycle time of 2.2 s. Efforts have been dedicated to increase the intensity
to 4x1013 protons on target.
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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/m1/62/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.