Resistive Plate Chamber (RPC) is a parallel plate gaseous detector built using electrodes of high volume resistivity. Operation and performance of the RPCs crucially depends upon the conductive coating on the outer side of the electrodes. Therefore, it is imperative to study in detail the effect of the surface resistivity of the electrodes' coating on RPC characteristics and performance. In this report, the effects of surface resistivity of conductive coating on the spatial dispersion of the induced charge by the three fabricated prototype RPCs with surface resistivities of 1 MΩ/ , 100 kΩ/ , 40 kΩ/ were studied experimentally. A double-Gaussian function was used to fit the dispersion of the induced charge of the RPC. It is shown that the Gaussian distribution with the narrower width is due to the spread of the avalanche charge in the gas gap of the RPC and that of larger width is due to diffusion of charge as it passes through the resistive coat film. Effect of resistivity on other RPC detector parameters such as efficiency, noise rate and strip-multiplicity is also reported.
Multifractal analysis is carried out for the interactions of 4.5 A and 14.5 A GeV/c 28 Si beams with emulsion, CNO and AgBr targets using the standard method of Gq moments. The Rényi dimensions Dq are evaluated and the results on self-similar multifractal spectra are presented. The variation of Dq with q is looked into and the findings reveal that the behaviour is in consistency with the multifractal characteristic of the multiplicity distributions in the various interactions studied. The self-similar multifractal spectra are found to be concave downwards with maximum at αq = 0. Further, Lévy stability analysis is carried out for these interactions. The Lévy stability index μ extracted from multifractal spectrum is found to lie in the range [0, 2] in agreement with the Lévy stability theory.
In this paper, we investigate thermal pairwise quantum correlation for any pair of spins of a mixed-three-spin XXX Heisenberg system (with spins connected together with the nearest-neighbour (NN) and that of the next-nearest-neighbour (NNN) coupling constants J 1 and J 2 ) by means of concurrence and quantum discord, as functions of temperature T , magnetic field B and the coupling constants J 2 and J 1 . Some comparisons between these measures of entanglement are done for next-nearest-neighbour spins. We also express some magnetic properties and discuss the behaviour of the system in some special critical points. Some interesting and novel discussions are done to introduce some entanglement witnesses.
As part of detailed optimization studies on Resistive Plate Chambers (RPCs) to be deployed in huge numbers in the INO-ICAL experiment, effects of integration time on the dispersion of the induced charge as well as position resolution of a prototype RPC was studied. Two, G10 based pickup panels of strip widths 5 mm and 3 mm were used in these studies. A double Gaussian function was used to fit the dispersion of the induced charge on the strips due to passage of cosmic ray muons through the RPC.
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