Ledingham, K.W.D. et al. (2000) Photonuclear physics when a multiterawatt laser pulse interacts with solid targets. Physical Review Letters, 84 (5). 899 -902. ISSN 0031-9007 (doi:10.1103/PhysRevLett.84.899)
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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.84.899
When a laser pulse of intensity 10(19) W cm(-2) interacts with solid targets, electrons of energies of some tens of MeV are produced. In a tantalum target, the electrons generate an intense highly directional gamma-ray beam that can be used to carry out photonuclear reactions. The isotopes C-11, K-38, (CU)-C-62.64, Zn-63, Ag-106, Pr-140, and Ta-180 have been produced by (gamma, n) reactions using the VULCAN laser beam. In addition, laser-induced nuclear fission in U-238 been demonstrated, a process which was theoretically predicted at such laser intensities more than ten years ago. The ratio of the C-11 and the (CU)-C-62 beta(+) activities yields shot-by- shot temperatures of the suprathermal electrons at laser intensities of similar to 10(19) W cm(-2).
|Glasgow Author(s):||Singhal, Dr Ravi and Cresswell, Dr Alan and Ledingham, Prof Kenneth and Sanderson, Prof D|
|Authors:||Ledingham, K.W.D., Spencer, I., McCanny, T., Singhal, R.P., Santala, M.I.K., Clark, E., Watts, I., Beg, F.N., Zepf, M., Krushelnick, K., Tatarakis, M., Dangor, A.E., Norreys, P.A., Allott, R., Neely, D., Clark, R.J., Machacek, A.C., Wark, J.S., Cresswell, A., Sanderson, D., and Magill, J.|
|Subjects:||Q Science > QC Physics|
|College/School:||College of Science and Engineering > School of Physics and Astronomy|
|Journal Name:||Physical Review Letters|
|Publisher:||American Physical Society|