435 research outputs found
Measurement of nuclear effects in neutrino interactions with minimal dependence on neutrino energy
We present a phenomenological study of nuclear effects in neutrino
charged-current interactions, using transverse kinematic imbalances in
exclusive measurements. Novel observables with minimal dependence on neutrino
energy are proposed to study quasielastic scattering, and especially resonance
production. They should be able to provide direct constraints on nuclear
effects in neutrino- and antineutrino-nucleus interactions.Comment: 7 pages, 9 figures, accepted version by PR
A Survey of the Northern Sky for TeV Point Sources
A search for steady TeV point sources anywhere in the northern sky has been
made with data from the Milagrito air-shower-particle detector. Over 3 x 10**9
events collected from 1997 February to 1998 May have been used in this study.
No statistically significant excess above the background from the isotropic
flux of cosmic rays was found for any direction of the sky with declination
between -5 degrees and 71.7 degrees. Upper limits are derived for the photon
flux above 1 TeV from any steady point source in the northern sky.Comment: 2 Figure
Milagro: A TeV observatory for gamma-ray bursts
Observation of prompt TeV Îł-rays from GRBs requires a new type of detector to overcome the low duty factor and small field of view of current TeV observatories. Milagro is such a new type of very high energy (\u3e a few 100 GeV) gamma-ray observatory, which has a large field of view of \u3e1 steradian and 24 hours/day operation. Milagrito, a prototype for Milagro, was operated from February 1997 to May 1998. During the summer of 1998, Milagrito was dismantled and Milagro was built. Both detectors use a 80âmĂ60âmĂ8âm pond of water in which a 3âmĂ3âm grid of photomultiplier tubes detects the Cherenkov light produced in the water by the relativistic particles in extensive air showers. Milagrito was smaller and had only one layer of photomultipliers, but allowed the technique to be tested. Milagrito observations of the Moonâs shadow and Mrk 501 are consistent with the Monte Carlo prediction of the telescopeâs parameters, such as effective area and angular resolution. Milagro will have improved flux sensitivity over Milagrito due to larger effective area, better angular resolution and cosmic-ray background rejection
Search for Short Duration Bursts of TeV Gamma Rays with the Milagrito Telescope
The Milagrito water Cherenkov telescope operated for over a year. The most
probable gamma-ray energy was ~1 TeV and the trigger rate was as high as 400
Hz. We have developed an efficient technique for searching the entire sky for
short duration bursts of TeV photons. Such bursts may result from "traditional"
gamma-ray bursts that were not in the field-of-view of any other instruments,
the evaporation of primordial black holes, or some as yet undiscovered
phenomenon. We have begun to search the Milagrito data set for bursts of
duration 10 seconds. Here we will present the technique and the expected
results. Final results will be presented at the conference.Comment: submitted to XXVI International Cosmic Ray Conference, Salt Lake Cit
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