1,787 research outputs found
A reconstruction method for neutrino induced muon tracks taking into account the apriori knowledge of the neutrino source
Gamma ray earthbound and satellite experiments have discovered, over the last
years, many galactic and extra-galactic gamma ray sources. The detection of
astrophysical neutrinos emitted by the same sources would imply that these
astrophysical objects are charged cosmic ray accelerators and help to resolve
the enigma of the origin of cosmic rays. A very large volume neutrino telescope
might be able to detect these potential neutrino emitters. The apriori known
direction of the neutrino source can be used to effectively suppress the
optical background and increase significantly the tracking efficiency
through causality filters. We report on advancing filtering and prefit
techniques using the known neutrino source direction and first results are
presented.Comment: 10 pages, 4 figures, to be published in Nucl. Inst. and Meth. A v2:
minor changes, 1 page adde
Evaluation of the discovery potential of an underwater Mediterranean neutrino telescope taking into account the estimated directional resolution and energy of the reconstructed tracks
We report on the development of search methods for point-like and extended
neutrino sources, utilizing the tracking and energy estimation capabilities of
an underwater, Very Large Volume Neutrino Telescope (VLVnT). We demonstrate
that the developed techniques offer a significant improvement on the
telescope's discovery potential. We also present results on the potential of
the Mediterranean KM3NeT to discover galactic neutrino sources.Comment: 12 pages, 1 figure, to be published in Nucl. Inst. and Meth. A v2:
minor changes, 1 page adde
Reconstruction efficiency and discovery potential of a Mediterranean neutrino telescope: A simulation study using the Hellenic Open University Reconstruction & Simulation (HOURS) package
We report on the evaluation of the performance of a Mediterranean very large
volume neutrino telescope. We present results of our studies concerning the
capability of the telescope in detecting/discovering galactic (steady point
sources) and extragalactic, transient (Gamma Ray Bursts) high energy neutrino
sources as well as measuring ultra high energy diffuse neutrino fluxes. The
neutrino effective area and angular resolution are presented as a function of
the neutrino energy, and the background event rate (atmospheric neutrinos and
muons) is estimated. The discovery potential of the neutrino telescope is
evaluated and the experimental time required for a significant discovery of
potential neutrino emitters (known from their gamma ray emission, assumedly
produced by hadronic interactions) is estimated. For the simulation we use the
HOU Reconstruction & Simulation (HOURS) software package.Comment: 10 pages, 4 figures, to be published in Nucl. Inst. and Meth. A v2:
minor changes, 1 page adde
A Feasibility Study for the Detection of Supernova Explosions with an Undersea Neutrino Telescope
We study the potential of a very large volume underwater Mediterranean
neutrino telescope to observe neutrinos from supernova (SN) explosions within
our galaxy. The intense neutrino burst emitted in a SN explosion results in a
large number of MeV neutrinos inside the instrumented volume of the neutrino
telescope that can be detected (mainly) via the reaction \nu_e-bar + p -> e^+ +
n . In this study we simulated the response of the underwater neutrino
telescope to the electron antineutrino flux predicted by the Garching model for
SN explosions. We assumed that the neutrino telescope comprises 6160 direction
sensitive optical modules, each containing 31 small photomultiplier tubes.
Multiple coincidences between the photomultiplier tubes of the same optical
module are utilized to suppress the noise produced by radioactive
decays and to establish a statistical significant signature of the SN
explosion.Comment: 11 pages, 3 figures, to be published in Nucl. Inst. and Meth. A v2:
minor changes, 1 page adde
Psychopathological Predictors of Indirect Self-Destructiveness in Patients with Schizophrenia
Angular reconstruction of high energy air showers using the radio signal spectrum
The Hellenic Open University extensive air shower array (also known as
Astroneu array) is a small scale hybrid detection system operating in an area
with high levels of electromagnetic noise from anthropogenic activity. In the
present study we report the latest results of the data analysis concerning the
estimation of the shower direction using the spectrum of the RF system. In a
recent layout of the array, 4 RF antennas were operating receiving a common
trigger from an autonomous detection station of 3 particle detectors. The
directions estimated with the RF system are in very good agreement with the
corresponding estimations using the particle detectors demonstrating that a
single antenna has the potential for reconstructing the shower axis angular
direction
Gender Differentiation in Indirect Self-Destructiveness and Suicide Attempt Methods (Gender, Indirect Self-Destructiveness, and Suicide Attempts)
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