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Your search keyword '"Kumar, Harish"' showing total 140 results
Start Over Author "Kumar, Harish" Publication Type Conference Materials
140 results on '"Kumar, Harish"'

2. Crystal growth and magnetic properties of pyrochlore iridate Bi2Ir2O7.

Author

Kumar, Harish, Klinger, M., Jesche, A., and Kuntscher, C. A.

Subjects
CRYSTAL growth, MAGNETIC crystals, MAGNETIC properties, PYROCHLORE, SINGLE crystals
Abstract

We report the single crystal growth of pyrochlore iridate Bi2Ir2O7 and its magnetic properties. The single crystals of Bi2Ir2O7 have been grown at 1150°C through the self-flux method. The crystals are found in octahedron-type shape with a typical size of ~340 µm. The Laue diffraction pattern suggests that the crystals of Bi2Ir2O7 are in a unique crystalline domain. Temperature-dependent zero-field and field-cooled magnetization data do not exhibit magnetic bifurcation down to 2 K and isothermal magnetization at 2K show a low moment 0.019 µB/f.u. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Break-up fusion in the 16O + 146Nd system by measurements of excitation function of evaporation residues.

Author

Sharma, Nitin, Singh, D., Mahato, Amritraj, Giri, Pankaj K., Linda, Sneha B., Kumar, Harish, Tali, Suhail A., Ansari, M. Afzal, Kumar, R., Muralithar, S., and Singh, R. P.

Subjects
DEEP inelastic collisions, PROJECTILES, STATISTICAL models, MEASUREMENT
Abstract

Measurements of excitation function (EF) for the evaporation residues populated via complete and incomplete fusion in interaction of projectile 16O with target 146Nd have been done. Stack foil activation technique has been employed for these measurements. The measured excitation functions of the four ERs 158Er (4n), 157Er(5n), 155Dy(α3n) and 153Dy(α5n) has been compared with statistical model code PACE-4. The present measurements show that the experimental excitation functions for xn-emission channels follow the PACE-4 predictions to a great extent, whereas, α-emission channels don't agree well and exhibits considerable enhancement from theoretical predictions. The enhancements may be ascribed to the break-up of projectile 16O resulting in incomplete fusion as PACE-4 considers only the complete fusion process. It has also been found that with increment in the projectile energy, probability of projectile break-up increases. Further, the comparison of present data with earlier measurements supports that the incomplete fusion contribution increases with the entrance channel mass asymmetry of the system, but differently for different projectiles. [ABSTRACT FROM AUTHOR]

Published
2020
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29. Incomplete fusion dynamics in 19F + 154Sm system at energies ≈ 4-6 MeV/nucleon.

Author

Mahato, Amritraj, Singh, D., Giri, Pankaj K., Sharma, Nitin, Linda, Sneha B., Kumar, Harish, Tali, Suhail A., Ansari, M. Afzal, Kumar, R., Muralithar, S., and Singh, R. P.

Subjects
DEEP inelastic collisions, PARTICLES (Nuclear physics), DATA analysis, MEAN field theory, PROJECTILES
Abstract

To study the dependence of incomplete fusion on entrance channel parameters, the excitation functions of evaporation residues populated through complete and/or incomplete fusion in 19F + 154Sm system were measured at projectile energy range ≈ 4–6 MeV/nucleon The measured excitation functions were compared with theoretical model PACE-4 predictions. Analysis of measured data suggests the production of xn/pxn-channels via complete fusion, as these were satisfactorily reproduced by PACE-4 cross-sections, while, a significant enhancement in the cross-sections of α-emitting channels was found, which was attributed due to the incomplete fusion process. A systematic study suggests that the incomplete fusion contribution increases with the entrance channel mass asymmetry and coulomb factor. Further, a study on the breakup threshold suggests that the incomplete fusion contribution increases with decrease in the α-Q value of the projectile. These present results clearly show the effect of projectile structure on ICF dynamics along with other entrance channel parameters. [ABSTRACT FROM AUTHOR]

Published
2020
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38. Smart mobility

Author

Kumar, Harish, primary, Singh, Manoj Kumar, additional, and Gupta, M. P., additional

Published
2018
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50. Self-focusing of Q-Gaussian Laser Beam in Relativistic plasma using exponential density based transition.

Author

Aggarwal, Munish, Richa, Kumar, Harish, Arora, Navdeep Singh, Gill, Tarsem Singh, and Deepshikha

Subjects
LASER beams, PLASMA density, GAUSSIAN beams, RUNGE-Kutta formulas, RAYLEIGH waves
Abstract

We have investigated self-focusing of a q-Gaussian laser beam in a relativistic plasma channel using exponential density based transition. The present paper is devoted to the importance of using a ramp density profile in decreasing the beam width parameter considerably. The preference of ramp type plays a better role in guiding the high intensity laser pulses to several Rayleigh lengths. Our results obtained from numerical analysis show that laser self-focusing can be controlled by varying laser intensity parameter, q-values and suitable density ramp parameter. We have derived the nonlinear differential equation for the beam width parameter using WKB and Paraxial ray approximation and solved it numerically using the Runge Kutta method to study the nature of self-focusing and defocusing. It is observed that self-focusing of q-Gaussian laser beam can be increased with increasing laser intensity parameter. Moreover, in case of q-Gaussian laser beam, it is easier to focus lower q-values using suitable type of plasma density ramp. [ABSTRACT FROM AUTHOR]

Published
2018
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