20,083 research outputs found
Remarks, More Remarks and a Grounds of Decision: One Judgment too Many? TT Durai v Public Prosecutor, Unreported Magistrate's Appeal
Pinning down neutrino oscillation parameters in the 2-3 sector with a mgnetised atmospheric neutrino detector: a new study
We determine the sensitivity to neutrino oscillation parameters from a study
of atmospheric neutrinos in a magnetised detector such as the ICAL at the
proposed India-based Neutrino Observatory. In such a detector that can {\em
separately} count and -induced events, the
relatively smaller (about 5\%) uncertainties on the neutrino--anti-neutrino
flux ratios translate to a constraint in the analysis that results in
a significant improvement in the precision with which neutrino oscillation
parameters such as can be determined. Such an effect is
unique to all magnetisable detectors and constitutes a great advantage in
determining neutrino oscillation parameters using such detectors. Such a study
has been performed for the first time here. Along with an increase in the
kinematic range compared to earlier analyses, this results in sensitivities to
oscillation parameters in the 2--3 sector that are comparable to or better than
those from accelerator experiments where the fluxes are significantly higher.
For example, the precisions on and
achievable for 500 kTon yr exposure of ICAL are
and respectively for both normal and inverted
hierarchies. The mass hierarchy sensitivity achievable with this combination
when the true hierarchy is normal (inverted) for the same exposure is
()
Driven weak to strong pinning crossover in partially nanopatterned 2H-NbSe2 single crystal
Investigations into the heterogeneous pinning properties of the vortex state
created by partially nano-patterning single crystals of 2H-NbSe2 reveal an
atypical magnetization response which is significantly drive dependent.
Analysis of the magnetization response shows non-monotonic behavior of the
magnetization relaxation rate with varying magnetic field sweep rate. With all
the patterned pinning centers saturated with vortices, we find that the pinning
force experienced by the vortices continues to increase with increasing drive.
Our studies reveal an unconventional dynamic weak to strong pinning crossover
where the flow of the vortex state appears to be hindered or jammed as it is
driven harder through the interstitial voids in the patterned pinning lattice.Comment: 15 pages with 5 figure
Criticality of tuning in athermal phase transitions
We experimentally address the importance of tuning in athermal phase
transitions, which are triggered only by a slowly varying external field acting
as tuning parameter. Using higher order statistics of fluctuations, a singular
critical instability is detected for the first time in spite of an apparent
universal self-similar kinetics over a broad range of driving force. The
results as well as the experimental technique are likely to be of significance
to many slowly driven non-equilibrium systems from geophysics to material
science which display avalanche dynamics.Comment: 5 pages, 4 figure
A High Galactic Latitude HI 21cm-line Absorption Survey using the GMRT: II. Results and Interpretation
We have carried out a sensitive high-latitude (|b| > 15deg.) HI 21cm-line
absorption survey towards 102 sources using the GMRT. With a 3-sigma detection
limit in optical depth of ~0.01, this is the most sensitive HI absorption
survey. We detected 126 absorption features most of which also have
corresponding HI emission features in the Leiden Dwingeloo Survey of Galactic
neutral Hydrogen. The histogram of random velocities of the absorption features
is well-fit by two Gaussians centered at V(lsr) ~ 0 km/s with velocity
dispersions of 7.6 +/- 0.3 km/s and 21 +/- 4 km/s respectively. About 20% of
the HI absorption features form the larger velocity dispersion component. The
HI absorption features forming the narrow Gaussian have a mean optical depth of
0.20 +/- 0.19, a mean HI column density of (1.46 +/- 1.03) X 10^{20} cm^{-2},
and a mean spin temperature of 121 +/- 69 K. These HI concentrations can be
identified with the standard HI clouds in the cold neutral medium of the
Galaxy. The HI absorption features forming the wider Gaussian have a mean
optical depth of 0.04 +/- 0.02, a mean HI column density of (4.3 +/- 3.4) X
10^{19} cm^{-2}, and a mean spin temperature of 125 +/- 82 K. The HI column
densities of these fast clouds decrease with their increasing random
velocities. These fast clouds can be identified with a population of clouds
detected so far only in optical absorption and in HI emission lines with a
similar velocity dispersion. This population of fast clouds is likely to be in
the lower Galactic Halo.Comment: 19 pages, 19 figures. Accepted for publication in Journal of
Astrophysics & Astronom
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