Abstract
Detailed neutron energy spectra produced from a CD2 target irradiated by a 450fs, 20J, 1053nm laser at an intensity of 3×1018W∕cm2 have been studied. Wide-ranging neutron spectra were observed from two different observation angles 20° and 70° relative to the rear-side target normal. The experiment and numerically calculated spectra, by a three-dimensional Monte Carlo code, indicate that the range of the measured spectra is larger than that produced by the D(d,n)He3 reaction. An interpretation for the measured spectra is introduced by considering the C12(d,n)N13 and D(c12,n)N13 reactions. In addition, the study revealed that the neutron spectra produced by the D–C and C–D reactions can overlap that produced by the D–D reaction, and due to their high cross sections, comparing to the D–D reaction, both of them effectively participate in the neutron yield.
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