Gamma-Rays Generated from Plasmas in the Interaction of Solid Targets with Femtosecond Laser Pulses
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HE Jing-tang,
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ZHANG Ping,
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CHEN Duan-bao,
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LI Zu-hao,
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ZHANG Ying,
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WANG Long,
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FENG Bao-hua,
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ZHANG Xiu-lan,
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WEI Zhi-yi,
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LI Zan-liang,
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TANG Xiao-wei,
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ZHANG Jie
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Abstract
The γ-rays with energies up to 300keV have been observed from plasmas produced by femtosecond laser pulses at a focused intensity of 5 x 1015 W.cm-2.μm2 irradiating Ta, Mo, and Cu targets. By introducing an 8% prepulse of 70ps before the main pulse, the fraction of high energy γ-ray photons (hv >l00keV) was significantly enhanced relative to low energy photons (hv < 100 keV).
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