Photofission of Heavy Nuclei from 0.2 to 3.8 GeV

Cetina, C; Heimberg, P; Berman, B L; Briscoe, W J; Feldman, G; Murphy, L Y; Crannell, Hall; Longhi, A; Sober, D I; Sanabria, J C; Kezerashvili, G Ya

doi:10.1103/PhysRevC.65.044622

Title: Photofission of Heavy Nuclei from 0.2 to 3.8 GeV

Journal Article · Mon Apr 01 00:00:00 EST 2002 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.65.044622· OSTI ID:813950

Cetina, C; Heimberg, P; Berman, B L; Briscoe, W J; Feldman, G; Murphy, L Y; Crannell, Hall; Longhi, A; Sober, D I; Sanabria, J C; Kezerashvili, G Ya

Total photofission cross sections for {sup 237}Np, {sup 233}U, {sup 235}U, {sup 238}U, {sup 232}Th, and {sup nat}Pb have been measured simultaneously, using tagged photons in the energy range E{sub {gamma}} = 0.17-3.84 GeV in Hall B at Jefferson Lab. The fission fragments were detected using parallel-plate avalanche detectors. Our results show that, of these nuclei, {sup 237}Np has the largest photofission cross section per nucleon, and that the photofission cross section for {sup 238}U relative to that for {sup 237}Np is about 80% over the entire energy range. The relative photofission cross sections per nucleon increase with the fissility parameter Z{sup 2}/A, approaching an apparent asymptote at the Z{sup 2}/A value for {sup 237}Np, and they do not depend strongly on the incident photon energy over this entire energy range. These results, together with a comparison of the {sup 237}Np photofission cross section per nucleon with total photoabsorption data, indicate that the photofission probability for {sup 237}Np is almost unity. If we make this assumption, we observe a significant shadowing of the interior nucleons starting below 1.5 GeV, so that the photoabsorption cross section decreases by 20% near 4 GeV.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Research (ER) (US)

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 813950

Report Number(s):: DOE/ER/40150-2527; TRN: US0303967

Journal Information:: Physical Review C, Vol. 65, Issue 4; Other Information: PBD: 1 Apr 2002

Country of Publication:: United States

Language:: English

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Title: Photofission of Heavy Nuclei from 0.2 to 3.8 GeV

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