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We report the creation of super-high-flux gamma-rays with energy >8 MeV andphoto-neutrons via the (g,n) reaction near giant dipole resonance energies (8 -20 MeV), using the ~130 J Texas Petawatt laser to irradiate high-Z (Au, Pt, Re,W) targets of mm - cm thickness, at laser intensities up to ~5x1021W/cm2. Wedetected up to ~ several x 1012 gamma-rays > 8 MeV (~3% of incident laserenergy) and ~ 1010 photo-neutrons per shot. Due to the short pulse and narrowgamma-ray cone (~17o half-width) around laser forward, the peak emergentgamma-ray flux >8 MeV reached ~1027 gammas/cm2/sec, and the peak emergentneutron flux reached ~1020 neutrons/cm2/sec. Such intense gamma-ray and neutronfluxes are among the highest achieved for short-pulse laser experiments. Theywill facilitate the study of nuclear reactions requiring super-high-flux ofgamma-rays or neutrons, such as the creation of r-process elements. Theseresults may also have far-reaching applications for nuclear energy, such as thetransmutation of nuclear waste.

Creation of super-high-flux photo-neutrons and gamma-rays > 8 MeV using a petawatt laser to irradiate high-Z solid targets