227 research outputs found
Cosmic Ray Muon Physics
We present a review of atmospheric and underground muon flux measurements.
The relevance of these data for the atmospheric neutrino flux computation is
emphasized. Possible sources of systematic errors in the measurements are
discussed, focusing on the sea level muon data. Underground muon data are also
reported
Atmospheric Neutrinos and Neutrino Oscillations
After some generalities on neutrino oscillations and on neutrinos, the recent
experimental results presented by Soudan 2, MACRO and SuperKamiokande at the
Neutrino'98 conference are summarized and discussed
Cosmological magnetic fields by parametric resonance?
We investigate the possibility that electromagnetic fluctuations are
amplified in expanding universe by parametric resonance, during the oscillatory
regime of a scalar field to which they are coupled. We consider scalar
electrodynamics and we find that electromagnetic fluctuations undergo
exponential instabilities. This mechanism could have some relevance for the
problem of large scale primordial magnetic fields
Introduction to the Workshop "30 years of bubble chamber physics"
After some recollections of the early bubble chamber times, a brief overview
of the golden age of the field is made, including its legacy and the use of
bubble chamber events for the popularization of science
Hadron-nuclei collisions at high energies
A brief historical review is made of the hadron-hadron (hh) total cross
section and hadron-nucleus absorption cross section measurements, made mainly
at high energy proton synchrotrons. Then I shall discuss low p_tprocesses,
including diffraction processes and fragmentation of nuclei in nucleus-nucleus
collisions. Nucleus-nucleus collisions at higher energy colliders are then
considered, mainly in the context of the search for the gluon quark plasma.
Conclusions and a short discussion on perspectives follow
The MACRO Experiment at Gran Sasso
In this overview of the MACRO experiment we recall the structure of the
detector and discuss several physics topics: atmospheric neutrinos and neutrino
oscillations, high energy neutrino astronomy, searches for WIMPs and for low
energy stellar gravitational collapse neutrinos, stringent upper limits on GUT
magnetic monopoles, high energy downgoing muons, primary cosmic ray composition
and shadowing of primary cosmic rays by the Moon and the Sun
Summary of MACRO results on exotic physics
MACRO was a multi-purpose experiment that took data from 1989 to 2000, at the
underground Laboratory of Gran Sasso (Italy). MACRO gave important
results/limits concerning: (i) the oscillation of atmospheric neutrinos, also
in the non-conventional scenario of violations of Lorentz invariance, (ii) the
searches for exotic particles (supermassive GUT magnetic monopoles,
nuclearites, WIMPs), (iii) muon physics and astrophysics. A summary of the
MACRO results will be presented and discussed, focusing the attention on the
exotica searches
Science,technology and society
We shall discuss some aspects of science and technology, their increasing
role in the society, the fast advances in modern science, the apparent decrease
of interest of the young generation in basic sciences, the importance of proper
science popularization for better public education and awareness in scientific
fields
Some Remarks on the Question of Charge Densities in Stationary-Current-Carrying Conductors
Recently, some discussions arose as to the definition of charge and the value
of the density of charge in stationary-current-carrying conductors. We stress
that the problem of charge definition comes from a misunderstanding of the
usual definition. We provide some theoretical elements which suggest that
positive and negative charge densities are equal in the frame of the positive
ions
Fragmentation cross sections of 158 A GeV Pb ions in various targets measured with CR39 nuclear track detectors
We report the measurement of the fragmentation cross sections in high-energy
nucleus-nucleus collisions using the 158 A GeV Pb beam from the CERN-SPS. The
fragments have charges changed from that of the incident projectile nucleus by
, with 8 <\Delta Z <75. The targets range from
polyethylene to lead. Charge identification is made with CR39 nuclear track
detectors, measured with an automatic image analyzer system. The measured
fragmentation cross sections are parameterized with an empirical relation in
terms of the atomic mass of the target, and of the charge of the final
fragment
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