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.
The DONUT experiment used an emulsion/counter-hybrid-detector, which succeeded in detecting tau–neutrino charged-current interactions. A new method of emulsion analysis, NETSCAN, was used to locate ...neutrino events and detect tau decays. It is based on a fully automated emulsion readout system (Ultra Track Selector) developed at Nagoya University.
The achieved plate-to-plate alignment accuracy of
∼0.2
μm
over an area of
2.6
mm×2.6
mm
permitted an efficient and systematic tau decay search using emulsion data. Moreover, this accuracy allowed measurement of particle momenta by multiple Coulomb scattering, and contributed to the efficient background rejection for the
ν
τ candidates. This paper describes details of our emulsion analysis methods.
Using a neutrino beam in which a
ν
τ
component was identified for the first time, the
ν
τ
magnetic moment was measured based on a search for an anomalous increase in the number of neutrino–electron ...interactions. One such event was observed when 2.3 were expected from background processes, giving an upper 90% confidence limit on
μ
ν
τ
of 3.9×10
−7
μ
B
.
We present the concept and design of a liquid scintillator detector for a long-baseline neutrino oscillation experiment. Neutrinos interact in 2.5 cm thick steel plates alternating with 2.0 cm thick ...planes of liquid scintillator. The scintillator is contained in multicell PVC extrusions containing individual 2 cm×3 cm cells up to 8 m long. Readout of the scintillation light is via wavelength-shifting fibers which transport light to pixellated photodetectors at one end of the cells.
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.
We present a method of momentum measurement of charged particles using emulsion data from the DONuT experiment, and report results from the momentum analysis of secondary particles from neutrino ...interactions. In 578 neutrino interactions, 2338 secondary particles were analyzed and 83.2% of attempted particles were measured by multiple coulomb scattering.
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