[en] In this article, we focused on the selection of suitable material that can be used as a dielectric material for the INO RPC detector's pick up strip panel. We found ceramic cement as a suitable material for this purpose which satisfied all selection criteria. (author)

[en] Usually scalar (Ø) photon (γ) interaction through dim-5 operators originates in many theories beyond standard model of particle physics. Scalar photon interaction turns vacuum into a birefringent and dichoric one and as a result, when a plane polarized light passes through such a medium, its plane of polarization rotates, making the vacuum optically active

[en] Sigma meson (σ, alias f₀) is a charge neutral scalar resonance and it has J^P = 0⁺. This resonance can decay into γγ with a width that lies between Γ_σ→γγ = 3-5 keV. Although it doesn't have a direct coupling to two photons at the tree level, however, it can couple to the latter via loop effects. However there are differences of opinion about the structure of this resonance and the possible contribution to the loop effects from quark as well as the meson sectors. The structure of the two photon decay vertex for σγγ follows from the interaction part of a Lagrangian respecting gauge and Lorentz invariance

[en] Since the last decade we have come across some observational evidence suggest that the universe is currently undergoing acceleration. A way to resolve this problem is by introducing a scalar field that provides 'dark energy' with negative pressure, that couples to ordinary matter fields. There are many theories where the existence of light scalar fields is possible, e.g. in string theory there are many moduli fields that couple to matter or scalar tensor theory etc. One such theory goes by the name of the chameleonic theory. The introduction of chameleon field was to explain to the source of dark matter in the universe

[en] Glass Resistive Plate Chamber (RPC) detector has a long history dating back to 1970s. For large area coverage, RPC detector array is a key component of muon detection and tracking. RPCs find use as the active elements in the tracking (iron) calorimeter which can simultaneously measure the energy as well as the direction of the charged particle. RPC detector is preferred over scintillation detector because of important reasons such as high position resolution and detection efficiency, has large area but at minimal material cost, easy to assemble and possesses simple read-out electronics and exhibits better time resolution (than scintillators) along with long-term stability. There are initially two types of RPCs in use, i.e. glass and Bakelite electrode RPCs. The glass RPCs have been proposed as the active element in the iron calorimeter detector for the India-based Neutrino Observatory (INO)

[en] Prototype glass Resistive Plate Chamber (RPC) detectors are under fabrication at Banaras Hindu University. The RPC shown is made of two parallel float glass sheets of thickness 2.0 mm each and a gas gap of 2 mm. The dimension of the RPC is 50×50 cm². Two Mylar sheets of same size have been placed just above the glass plate to provide better isolation. Pickup strips are placed over the Mylar sheet one set along X-axis another over Y-axis. The width of the pickup strip is 2.5 cm each

[en] The theory of strong interaction, i.e., Quantum Chromodynamics (QCD), at the time of its inception, was associated with U(1) axial or U(1)_A problem related with the observed hadronic spectrum

[en] In this article we are reporting lower and upper simulated threshold values of VECC prototype INO ICAL RPC detectors. These values are very useful in calibrating the final muons momentum spectrum observed by this detector. (author)

[en] Radiation exposure modifies the nano scale free volume of the polymers which has direct correlation to certain properties of polymeric materials. CR-39 (DOP) polycarbonate polymeric films were exposed to gamma radiation at different doses for the study of nano scale free volume as well as structural and optical properties. An overall increase in the number of free volume holes at all doses was observed. UV-visible studies showed an improvement in the optical properties due to decrease in direct band gap energy. X-ray diffraction spectra of the polymer samples showed the increased amorphous nature of the polymer. (author)