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MECHANISM OF NUCLEAR FISSION
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100 neutron captures alpha particles angular distribution angular momentum anisotropic approximate bismuth bremsstrahlung calculated capture gamma element capture gamma sample collimator assembly compound nucleus configuration contribution Cr sample cross section due cross section obtained decrease determined effect emitted energy region equation excitation energy expected fission rates experimental exponential weighting function fission fragments fission process FISSION RATES Run gamma rays increase least squares LEAST SQUARES APPROXIMATION liquid drop model main line photon maximum MeV photon microns monochromatic photons neutron flux neutron scattering NEWF nuclear fission nucleons number of counts number of photons parameters PEWF PF cross section photofission cross section PHOTON BEAM photon energy photon flux plate positrons pulse height spectrum q/sec quantum number rabbit tube reaction reactor power Relative Intensity rotational Schmitt and Duffield section of U-238 shape solid angle standard deviation surface target thermal neutron threshold total photon flux uranium foil variation