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.
Seismic design requirements for precast concrete cladding panel connections have evolved significantly over the past fifty years. This paper summarizes the pertinent requirements from the Uniform ...Building Code from 1967 to 1997, and the International Building Code 2000. A hypothetical design illustrates how emphasis in the code has evolved for both lateral force requirements and story drift displacement requirements arriving at a balance of moderate lateral force and displacement requirements. The numerical results are based on a hypothetical case of panel connections for a ten-story moment-resisting steel frame structure built in seismic Zone 4. This historical summary is of value to designers who deal with the seismic rehabilitation of precast panel connections.
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.
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.
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
.
The DONUT collaboration has observed four events in a hybrid emulsion
spectrometer consistent with tau neutrino charged-current interactions. The
resulting tau lepton is identified by its decay into ...a single charged particle.
The expected background of charm decays and secondary interactions is .34 +/-
>.05 events. The probability that all tau neutrino candidates are due to
background proceesses is 1.1 x 10-4.
The DONUT collaboration has observed four events in a hybrid emulsion spectrometer consistent with tau neutrino charged-current interactions. The resulting tau lepton is identified by its decay into ...a single charged particle. The expected background of charm decays and secondary interactions is .34 +/- >.05 events. The probability that all tau neutrino candidates are due to background proceesses is 1.1 x 10-4.
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