120945477
On improvement of charge resolution of cosmic ray particles using a cellulose nitrate plastic detector
Abstract By employing improved procedures of measurement and analysis we have been able to obtain good charge resolution for stopping cosmic ray nuclei with Z ⩽30 in a cellulose nitrate detector. In a particular, it has been found that ( V t V b ) provides a much more reliable measure of ionisation loss than cone length. A charge resolution of 0.2 charge units for nuclei with Z ≲20 and of 0.3 charge units for nuclei with Z > 20 has been achieved in the present experiment.
122194176
Search for entrance channel effects in heavy ion induced fusion reactions via neutron evaporation
54082430
Ring and jet-like structures and two-dimensional intermittency in nucleus–nucleus collisions at 200AGeV/c
Abstract We have investigated the presence of ring and/or jet-like structures in the angular emission of secondary charged mesons (shower tracks) coming out of 16O–Ag/Br and 32S–Ag/Br interactions, each at an incident momentum of 200 A GeV / c . Nuclear photographic emulsion technique has been used to collect the experimental data. The experimental results have been compared with the results simulated by Monte Carlo method. The analysis indicates presence of ring and jet-like structures in the experimental data beyond statistical noise. This kind of jet structure is expected to give rise to a strong two-dimensional ( 2 d ) intermittency. The self-affine behaviour of 2d scaled factorial moments (SFM) has therefore been investigated and the strength of 2d intermittency has been determined. For each set of data the 2d results have been compared with the respective one-dimensional ( 1 d ) intermittency results.
118474507
INTERIOR REISSNER-NORDSTR ¨ OM METRIC ON SPHEROIDAL SPACE-TIMES
The collapse of a spherically symmetric distribution of matter to a point singularity can be avoided when the matter is accompanied by the presence of some charge, the gravitational attraction then being counterbalanced by the repulsive Coulombian force field in addition to the pressure gradient. The problem of determining analytic interior solutions to the coupled Einstein-Maxwell equations corresponding to charged perfect fluid spheres in equilibrium has therefore received considerable attention [1–8]. Vaidya and Tikekar [9] and Tikekar [10] have shown that spheriodal space-times (i.e. space-times whose t = const sections have the geometry of a 3-spheroid immersed in a 4-dimensional Euclidean space) admit solutions to the Einstein field equations describing the interior space-times of spherical superdense stars in equilibrium. This approach has also been extensively examined by Maharaj and Leach [11] and Mukherjee, et al. [12]. These studies indicate an intimate relationship between the spheroidal geometry of the physical space and the distribution of matter in equilibrium of astrophysical significance. Since the gravitational collapse of spherical distributions of matter can be averted by the presence of electric charge, there arises a pertinent question of whether space-times endowed with spheroidal geometry can accommodate the presence of an electric charge. In this paper it is shown that the ansatz prescribing the spheroidal geometry to the 3-space associated with
40924345
Plane Symmetric Domain Wall in Lyra Geometry
In this paper general solutions are found for domain walls in Lyra geometry in the plane symmetric spacetime metric given by Taub. Expressions for the energy density and pressure of domain walls are derived in both cases of uniform and time varying displacement field β. It is also shown that the results obtained by Rahaman et al [IJMPD, 10, 735 (2001)] are particular case of our solutions. Finally, the geodesic equations and acceleration of the test particle are discussed.
120176685
Intermittency and multiplicity moments of charged particles produced in 32S–Ag/Br interaction at 200 A GeV/c
The nature of nonstatistical fluctuations in the density distribution of singly charged particles produced in 32S–Ag/Br interactions at an incident momentum of 200 A GeV/c has been investigated. With the help of the nuclear photographic emulsion technique, the data were collected, and using different statistical methods of multiplicity moments these data have been analysed in terms of intermittency and fractal properties of one- and two-dimensional phase space distributions. Wherever possible, experimental results have been compared with the results obtained in other similar heavy-ion-induced experiments, as well as with those obtained from simulated events of the Lund Monte Carlo code FRITIOF. In some cases events simulated by generating (pseudo)random numbers have also been used for the purpose of comparison. The investigation shows the presence of weak intermittency in one dimension (1D) that is consistent with self-similarity in the density distribution. In two dimensions (2D), anisotropy in the distributions along longitudinal and transverse phase space variables indicates that self-affinity, rather than self-similarity in the distributions, is responsible for the observed behaviour. From the analysis of factorial correlators and oscillatory multiplicity moments, the presence of a few-particle short-range correlation has also been established. In almost all cases, the simulated interactions fail to replicate the experimental results.
120875055
Charged fluid distribution in higher dimensional spheroidal space-time
A general solution of Einstein field equations corresponding to a charged fluid distribution on the background of higher dimensional spheroidal space-time is obtained. The solution generates several known solutions for superdense star having spheroidal space-time geometry.