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21 Dec 1998

Volume 73, Issue 25, pp. 3629-3786

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MeV γ-ray yield from solid targets irradiated with fs-laser pulses

C. Gahn, G. Pretzler, A. Saemann, G. D. Tsakiris, K. J. Witte, D. Gassmann, T. Schätz, U. Schramm, P. Thirolf, and D. Habs

Appl. Phys. Lett. 73, 3662 (1998); http://dx.doi.org/10.1063/1.122855 (3 pages) | Cited 19 times

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We have investigated the MeV bremsstrahlung which is emitted when fast electrons generated by the interaction of 200 mJ, 130 fs Ti:sapphire laser pulses with a preformed plasma penetrate into a solid target. Employing different targets the dependence of the γ-ray spectrum on the atomic number was studied. We detected single γ photons with an energy up to 2.5 MeV and found a maximum conversion efficiency of the laser energy into MeV bremsstrahlung of 4×10−6. Data analysis using a Monte Carlo code revealed a fast-electron temperature of 0.9 MeV.© 1998 American Institute of Physics.
Show PACS
76.80.+y Mössbauer effect; other γ-ray spectroscopy
02.50.Ng Distribution theory and Monte Carlo studies
02.70.Rr General statistical methods
78.70.-g Interactions of particles and radiation with matter
79.20.Ds Laser-beam impact phenomena
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
78.47.-p Spectroscopy of solid state dynamics
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
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