Measurements of hadron production in p + C interactions at 31 GeV/
c
are performed using the NA61/SHINE spectrometer at the CERN SPS. The analysis is based on the full set of data collected in 2009 ...using a graphite target with a thickness of 4 % of a nuclear interaction length. Inelastic and production cross sections as well as spectra of
π
±
,
K
±
, p,
K
S
0
and
Λ
are measured with high precision. These measurements are essential for improved calculations of the initial neutrino fluxes in the T2K long-baseline neutrino oscillation experiment in Japan. A comparison of the NA61/SHINE measurements with predictions of several hadroproduction models is presented.
The T2K Side Muon Range Detector (SMRD) Aoki, S.; Barr, G.; Batkiewicz, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2013, Volume:
698
Journal Article
Peer reviewed
Open access
The T2K experiment is a long baseline neutrino oscillation experiment aiming to observe the appearance of νe in a νμ beam. The νμ beam is produced at the Japan Proton Accelerator Research Complex ...(J-PARC), observed with the 295km distant Super-Kamiokande Detector and monitored by a suite of near detectors at 280m from the proton target. The near detectors include a magnetized off-axis detector (ND280) which measures the unoscillated neutrino flux and neutrino cross-sections. The present paper describes the outermost component of ND280 which is a Side Muon Range Detector (SMRD) composed of scintillation counters with embedded wavelength shifting fibers and Multi-Pixel Photon Counter readout. The components, performance and response of the SMRD are presented.
The atmospheric neutrino flux is measured using a 3.4-kt yr exposure of the IMB-3 detector. Single-ring events are classified as showering or nonshowering using the geometry of the Cerenkov pattern. ...A simulation of neutrino interactions and three models of atmospheric neutrino production are used to predict the composition of the sample. The showering- nonshowering character is strongly correlated with the flavor of the neutrino parent. In the lepton momentum range of p less than 1500 MeV/c, it is found that nonshowering events comprise /41 + or - 3(stat) + or - 2(syst)/ percent of the total. The fraction expected is /51 + or - 5(syst)/ percent. (Author)
A burst of eight neutrino events a preceding the optical detection of the supernova in the Large Magellanic Cloud has been observed in a large underground water Cherenkov detector. The events span an ...interval of 6 s and have visible energies in the range 20-40 MeV.
Solar neutrino measurements from 1258days of data from the Super-Kamiokande detector are presented. The measurements are based on recoil electrons in the energy range 5.0{endash}20.0MeV. The measured ...solar neutrino flux is 2.32{+-}0.03(stat){sup +0.08}{sub {minus}0.07}(syst){times}10{sup 6} cm{sup {minus}2}s{sup {minus}1} , which is 45.1{+-}0.5(stat ){sup +1.6}{sub {minus}1.4}(syst) % of that predicted by the BP2000 SSM. The day vs night flux asymmetry ({Phi}{sub n}{minus}{Phi}{sub d})/ {Phi}{sub average} is 0.033{+-}0.022(stat){sup +0.013}{sub {minus}0.012}(syst) . The recoil electron energy spectrum is consistent with no spectral distortion. For the hep neutrino flux, we set a 90% C.L.upper limit of 40{times}10{sup 3} cm{sup {minus}2}s{sup {minus}1} , which is 4.3times the BP2000 SSM prediction.
A first study of neutron tagging is conducted in Super-Kamiokande, a 50,000 ton water Cherenkov detector. The tagging efficiencies of thermal neutrons are evaluated in a 0.2%
GdCl
3
-water solution ...and pure water. They are determined to be, respectively, 66.7% for events above 3
MeV and 20% with corresponding background probabilities of
2
×
10
-
4
and
3
×
10
-
2
. This newly developed technique may enable water Cherenkov detectors to identify
ν
¯
e
’s from astrophysical sources as well as those produced by commercial reactors via the delayed coincidence scheme.
C 5 A axial form factor from bubble chamber experiments Graczyk, K. M.; Kiełczewska, D.; Przewłocki, P. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
11/2009, Volume:
80, Issue:
9
Journal Article
Muon neutrinos produced as a result of cosmic-ray interactions with the atmosphere are used to search for nu(mu) oscillations into nu(tau) by comparing the measured rate of upward-going muons in the ...Irvine-Michigan-Brookhaven detector with the expected rate. In additions, the ratio of upward-going muons which stop in the detector to those which exit is used to search for deviations from the expected spectrum. This latter technique is free of flux and cross-section normalization uncertainties. No evidence for oscillations is found. (Author)
From an exposure of 25.5 kiloton-years of the Super-Kamiokande detector, 900 muon-like and 983 electron-like single-ring atmospheric neutrino interactions were detected with momentum
p
e
>100 MeV/
c,
...p
μ
>200 MeV/
c, and with visible energy less than 1.33 GeV. Using a detailed Monte Carlo simulation, the ratio (
μ/
e)
DATA/(
μ/
e)
MC was measured to be 0.61±0.03(stat.)±0.05(sys.), consistent with previous results from the Kamiokande, IMB and Soudan-2 experiments, and smaller than expected from theoretical models of atmospheric neutrino production.
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