The DONUT experiment has analyzed 203 neutrino interactions recorded in nuclear emulsion targets. A decay search has found evidence of four tau neutrino interactions with an estimated background of ...0.34 events. This number is consistent with the Standard Model expectation.
Identification of neutrino interactions using the DONUT spectrometer Kodama, K; Andreopoulos, C; Giokaris, N ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2004, 2004-01-00, Letnik:
516, Številka:
1
Journal Article
Recenzirano
The experimental apparatus used for the first direct observation of the tau neutrino (the DONUT experiment) is described. Its main features consisted of a target system composed of nuclear emulsion ...targets and scintillation fiber trackers, a magnetic charged-particle spectrometer and detectors for lepton identification. This paper will concentrate on the description of the electronic detectors and their performance in selecting neutrino interactions, making the vertex predictions necessary for locating events in the emulsion target and lepton identification.
A shadow of the Moon, with a statistical significance of 5{sigma}, has been observed in the underground muon flux at a depth of 2090 mwe using the Soudan 2 detector. The angular resolution of the ...detector is well described by a Gaussian with a sigma {<=}0.3 degree sign . The position of the shadow confirms that the alignment of the detector is known to better than 0.15 degree sign and has remained stable during ten years of data taking. (c) 2000 The American Physical Society.
We measure the horizontal (|cos(
θ
z
)|<0.14 corresponding to a slant depth cut 14 kmwe) neutrino-induced muon flux (
E
μ>1.8 GeV) in Soudan 2 to be 4.01
±
0.50
±
0.30
×
10
−13 cm
−2
sr
−1
s
−1. From ...the absence of horizontal muons with large energy loss, we set a limit on the flux of muon neutrinos from active galactic nuclei.
We report a measurement of the atmospheric neutrino flavor ratio, R, using a sample of quasi-elastic neutrino interactions occurring in an iron medium. The flavor ratio (tracks/showers) of ...atmospheric neutrinos in a 3.9 fiducial kiloton-year exposure of Soudan 2 is 0.64±0.11(stat.)±0.06(syst.) of that expected. Important aspects of our main analysis have been checked by carrying out two independent, alternative analyses; one is based upon automated scanning, the other uses a multivariate approach for background subtraction. Similar results are found by all three approaches.
A comprehensive characterization of Hamamatsu 16- and 64-anode PMTs Lang, K.; Day, J.; Eilerts, S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2001, Letnik:
461, Številka:
1
Journal Article
Recenzirano
We are reporting preliminary results of studies of R59000-00-M16 and M64 tubes, manufactured by Hamamatsu Photonics, to be employed by the MINOS neutrino experiment. Our tests focused on anode ...response uniformity, gain, cross-talk, and linearity for light illuminating PMTs through a 1.2
mm diameter fiber.
The atmospheric neutrino flavour ratio measured using a 1.52 kton-year exposure of Soudan 2 is found to be 0.72 ± 0.19
−0.07
+0.05 relative to the expected value from a Monte Carlo calculation. The ...possible background of interactions of neutrons and photons produced in muon interactions in the rock surrounding the detector has been investigated and is shown not to produce low values of the ratio.
As interest in neutrino oscillations has grown - spurred on by recent new results from Super-Kamiokande, K2K and SNO - plans for new experiments to study these phenomena in detail are moving forward. ...Here we summarize proposals for future atmospheric and accelerator experiments, concentrating on the reasonably near future, say the next decade. We give some attention to proposed superbeams, but not to neutrino factories, which lie farther in the future and are addressed elsewhere in these Proceedings.
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