Neutron production by fast protons from ultraintense laser-plasma interactions
نویسندگان
چکیده
Tens of MeV proton beams have been generated by interactions of the VULCAN petawatt laser with foil targets and used to induce nuclear reactions in zinc and boron samples. The numbers of C, Ga, Ga, Ga, Cu, Zn, Zn, and Zn nuclei have been measured and used to determine the proton energy spectrum. It is known that sp ,nd reactions provide an important method for producing neutron sources and in the present experiment up to ,109 neutrons sr−1 have been generated via Bsp ,ndC reactions. Using experimentally determined proton energy spectra, the production of neutrons via sp ,nd reactions in various targets has been simulated, to quantify neutron pulse intensities and energy spectra. It has been shown that as high as 43109 neutrons sr−1 per laser pulse can be generated via Lisp ,ndB reactions using the present VULCAN petawatt laser-pulse conditions. © 2004 American Institute of Physics. [DOI: 10.1063/1.1814421]
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