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ultra-intense-lasers
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Dissociation of C-H molecular bond of methane by pulse shaped ultra-intense laser field
, Article Chemical Physics Letters ; Volume 560 , 2013 , Pages 60-65 ; 00092614 (ISSN) ; Irani, E ; Navid, H. A ; Dehghani, Z ; Anvari, A ; Sadighi Bonabi, R ; Sharif University of Technology
2013
Abstract
The effects of laser field and laser pulse width on the dissociation probability of C-H bond of CH4 have been investigated. Calculation of time dependent Schrödinger equation by grid spectral method is carried out and it is produced optimistic results in comparison to the earlier Quasi-classical calculations. The results show that there is an excellent match with experimental data. In this work, a number of results in the emerging field of laser with intensity of I = 8 × 1013 W cm-2 and pulse duration of 100 fs are presented. The present modulated field leads to more than 20% improvement in the dissociation probability
The evaluation of transmutation of hazardous nuclear waste of 90Sr, into valuable nuclear medicine of 89Sr by ultraintense lasers
, Article Laser and Particle Beams ; Volume 28, Issue 2 , 2010 , Pages 269-276 ; 02630346 (ISSN) ; Sadighi Bonabi, R ; Sharif University of Technology
2010
Abstract
The analytical evaluation of the capability of Bremsstrahlung highly directional energetic γ-beam to induce photo transmutation of 90Sr (γ,n) 89Sr is presented. Photo transmutation of hazardous nuclear waste of 90Sr, one of the two main sources of heat and radioactivity in spent fuel into valuable nuclear medicine radioisotope of 89Sr is explained. Based on the calculations, a fairly decent fraction of gamma rays in this range are used in transmuting of 90Sr into 89Sr where according to the available experimental data it is shown that by irradiating a 1-cm thick 90Sr sample with lasers of intensity of 1021 W/cm2 and repletion rate of 100Hz for an hour, the reaction activity would be 1.45...
Possibility of ultra-intense laser transmutation of 93Zr (γ, n) 92Zr a long-lived nuclear waste into a stable isotope
, Article Energy Conversion and Management ; Volume 51, Issue 4 , 2010 , Pages 636-639 ; 01968904 (ISSN) ; Irani, E ; Safaie, B ; Imani, Kh ; Silatani, M ; Zare, S ; Sharif University of Technology
Abstract
The possibility of photonuclear transmutation of 93Zr, a highly radioactive nuclear waste with a half-life of 1.53 million years, into 92Zr its stable isotope, through a (γ, n) reaction has been analytically evaluated in this paper. By focusing Intensities more than 1020 W/cm2 onto a solid target, high energy electron generation, Bremsstrahlung and photonuclear reactions have been observed. Using the available data, the number of reactions that produced 92Zr, have been analytically calculated. In addition, this work has shown that the laser intensity, irradiation time and repetition rate of laser have strong and direct effects on the yield of 92Zr and the number of reactions. Irradiating a...