4,174 research outputs found
Detection of Supernova Neutrinos
Matter effects on neutrino oscillations in both, a supernova and the Earth,
change the observed supernova neutrino spectra. We calculate the expected
number of supernova neutrino interactions for ICARUS, SK and SNO detectors as a
function of the distance which they traveled in the Earth. Calculations are
performed for supernova type II at 10kpc from the Earth, using standard
supernova neutrino fluxes described by thermal Fermi--Dirac distributions and
the PREM I Earth matter density profile.Comment: Postscript file: 7 pages, 2 figures; tar-compressed file: tex source
code, eps figures. To appear in Acta. Phys. Pol. B. Talk given at the XXVIII
Mazurian Lakes School of Physics, Krzyze, Poland, August 31 - September 7,
200
The Atheism of Heidegger, Sartre, and Thomas Aquinas
Theodore J. Kisiel, an engineer and philosopher, now teaching at Canisius College, was an Assistant Professor at the University of Dayton when he offered this interesting response to Father Elbert\u27s views on existentialism. The points at issue are worthy of further dialogue
Femtoscopic signatures of collective behavior as a probe of the thermal nature of relativistic heavy ion collisions
Femtoscopy measures space-time characteristics of the particle emitting
source created in relativistic heavy-ion collisions. It is argued that
collective behavior of matter (radial flow) produces specific femtoscopic
signatures. The one that is best known, the m_T dependence of the pion ``HBT
radii'', can be explained by the alternative scenario of temperature gradients
in an initial state thermal model. We identify others that can invalidate such
alternatives, such as non-identical particle correlations and m_T scaling for
particles of higher mass. Studies with a simple rescattering code show that as
the interaction cross-section is increased the system develops collective
behavior and becomes more thermalized at the same time, the two effects being
the natural consequence of increased number of particle rescatterings.
Repeating calculations with a more realistic rescattering model confirmed all
of these conclusions and provided deeper insight into the mechanisms of
collectivity buildup, showing a preference for a thermal model with uniform
temperature.Comment: 9 pages, 11 figures ver2: added CERN report no., added references to
relevant previous works on transport model
Exploring Lifetime Effects in Femtoscopy
We investigate the role of lifetime effects from resonances and emission
duration tails in femtoscopy at RHIC in two Blast-Wave models. We find the
non-Gaussian components compare well with published source imaged data, but the
value of R_out obtained from Gaussian fits is not insensitive to the
non-Gaussian contributions when realistic acceptance cuts are applied to
models.Comment: 5 pages, 2 figure
Measurement of CHD on Titan at Submillimeter Wavelengths
We present the first radio/submillimeter detection of monodeuterated methane
(CHD) in Titan's atmosphere, using archival data from of the Atacama Large
Millimeter/submillimeter Array (ALMA). The and
transitions at 465.235 and 465.250 GHz ( mm) were measured at
significance levels of and , respectively. These two
lines were modeled using the Non-linear optimal Estimator for MultivariatE
spectral analySIS (NEMESIS) radiative transfer code to determine the
disk-averaged CHD volume mixing ratio = in Titan's
stratosphere (at altitudes km). By comparison with the CH vertical
abundance profile measured by Cassini-Huygens mass spectrometry, the resulting
value for D/H in CH is . This is consistent
with previous ground-based and in-situ measurements from the Cassini-Huygens
mission, though slightly lower than the average of the previous values.
Additional CHD observations at higher spatial resolution will be required
to determine a value truly comparable with the Cassini-Huygens CH
measurements, by measuring CHD with ALMA close to Titan's equator. In the
post-Cassini era, spatially resolved observations of CHD with ALMA will
enable the latitudinal distribution of methane to be determined, making this an
important molecule for further studies.Comment: 9 pages, 4 figure
A GEANT-based study of atmospheric neutrino oscillation parameters at INO
We have studied the dependence of the allowed space of the atmospheric
neutrino oscillation parameters on the time of exposure for a magnetized Iron
CALorimeter (ICAL) detector at the India-based Neutrino Observatory (INO). We
have performed a Monte Carlo simulation for a 50 kTon ICAL detector generating
events by the neutrino generator NUANCE and simulating the detector response by
GEANT. A chi-square analysis for the ratio of the up-going and down-going
neutrinos as a function of is performed and the allowed regions at 90%
and 99% CL are displayed. These results are found to be better than the current
experimental results of MINOS and Super-K. The possibilities of further
improvement have also been discussed.Comment: 8 pages, 13 figures, a new figure added, version accepted in IJMP
EXAFS studies of prostate cancer cell lines
Sulphur plays a vital role in every human organism. It is known, that sulphur-bearing compounds, such as for example cysteine and glutathione, play critical roles in development and progression of many diseases. Any alteration in sulphur's biochemistry could become a precursor of serious pathological conditions. One of such condition is prostate cancer, the most frequently diagnosed malignancy in the western world and the second leading cause of cancer related death in men. The purpose of presented studies was to examine what changes occur in the nearest chemical environment of sulphur in prostate cancer cell lines in comparison to healthy cells. The Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy was used, followed by theoretical calculations. The results of preliminary analysis is presented
Evaluation of the Beam Background Contribution to the pp Minimum Bias Sample Used for First Physics
The note describes the beam background conditions during first physics data taking with ALICE and the strategy for the evaluation of the LHC beam background contribution to the minimum bias event sample used for first physics
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