1,721,052 research outputs found
Probing Light Sterile Neutrino at ICAL-INO over a wide range
No full textThe Iron CALorimeter (ICAL) detector at the India-based Neutrino Observatory(INO) is an upcoming atmospheric neutrino oscillation experiment. The ICAL is designed to measure muon energy and direction with fine resolutions and high detection efficiency. The detector will have a fiducial mass of 50 kt and be magnetized to distinguish between νμ
\nu_\mu
and ν⎯⎯μ
\overline{\nu}_\mu
.
In this poster, we show the limits that the ICAL can put on the sterile neutrino mixing element |Uμ4|2
|U_{\mu4}|^2
over a broad range of Δm241∼(10−5−10)
\Delta m^2_{41} \sim (10^{-5} - 10)
eV2
^2
. We also quantify the importance of the spectral information and hadron energy calibration. The ICAL sensitivity is the largest in the range Δm241∼(0.5−5)×10−3
\Delta m^2_{41} \sim (0.5 - 5) \times 10^{-3}
eV2
^2
, where matter effects in the Earth play an important role. If sterile neutrinos exist, ICAL would be able to determine the sign of Δm241
\Delta m^2_{41}
with a high significance (>3σ
> 3\sigma
with an exposure of 500 kt-yr) in the same range
Supernova neutrinos: production, propagation and oscillations
No full textI shall review some of the recent results concerning the astrophysics of a core collapse supernova (SN) and neutrino oscillations. Neutrinos play an important role in the SN explosion, and they also carry most of the energy of the collapse. The energy spectra of neutrinos and antineutrinos arriving at the Earth incorporate information on the primary neutrino fluxes as well as the neutrino mixing scenario. The analysis of neutrino propagation through the matter of the supernova and the Earth, combined with the observation of a neutrino burst from a galactic SN, enables us to put limits on the mixing angle θ13 and identify whether the mass hierarchy is normal or inverted. The neutrino burst also acts as an early warning signal for the optical observation, and in addition allows us to have a peek at the shock wave while still inside the SN mantle
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Signatures of supernova neutrino oscillations
No full textAfter a brief review of our current understanding of neutrino flavor conversions inside a core collapse supernova, we analyze the signatures of these neutrino oscillations that can be observed at future large neutrino detectors. We examine the observability of model-independent signatures like the neutronization burst suppression, multiple spectral splits, earth matter effects, and shock wave effects. We also indicate some indirect oscillation signals, and comment on the effect of oscillations on supernova astrophysics. Finally we point out the features in the neutrino spectra that experiments should look for, even irrespective of their theoretical interpretations
Supernova neutrino oscillations: what do we understand?
Full text linkWe summarize our current understanding of the neutrino flavor conversions inside a core collapse supernova, clarifying the important role played by the "collective effects" in determining flavor conversion probabilities. The potentially observable νe and ν ̅e spectra may help us identify the neutrino mixing scenario, distinguish between primary flux models, and learn more about the supernova explosion
Neutrino-neutrino interactions in a supernova and their effect on neutrino flavor conversions
No full textThe neutrino‐neutrino interactions inside a supernova core give rise to nonlinear collective effects that significantly influence the neutrino flavor conversions inside the star. I shall describe these interactions, the new oscillation phenomena they generate, and their effect on the neutrino fluxes arriving at the earth
Supernova observations for neutrino mixing parameters
No full textThe neutrino spectra from a future galactic core collapse supernova could reveal information on the neutrino mixing pattern, especially on θ13 and the mass hierarchy. I briefly outline our current understanding of neutrino flavor conversions inside a supernova, and point out possible signatures of various neutrino mixing scenarios that the neutrino detectors should look for. Supernova neutrinos provide a probe for θ13 and mass hierarchy that is complementary to, and sometimes even better than, the current and proposed terrestrial neutrino oscillation experiments
Looking at a supernova shock in neutrinos
No full textWe analyze how the neutrino flavor conversion inside a core collapse supernova is affected by the shock wave, and show how the time dependent neutrino spectra can be used to reconstruct features of the shock wave while it is still inside the mantle
Some theoretical issues in heavy flavour physics
No full textSome of the recent developments in heavy flavour physics will be reviewed. This will include an update on some of the Standard Model predictions, and a summary of recent measurements that may indicate the presence of new physics (NP). The focus will be on selected models of NP that are indicated by the anomalies in the current data. Observables that can potentially yield signatures of specific physics beyond the Standard Model will be pointed out
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