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absorption cross section activation cross section Alamos alpha particle aluminum anamolous behavior anticoincidence circuit background counting beta activity beta counting rates beta particles bombarding boron disintegration cross BORON PROPORTIONAL COUNTER capture cross section capture process center counter compound nucleus correction counting efficiency cross section measurements curves disintegration cross section DOCTOR OF PHILOSOPHY due to scattered energy levels energy region fast neutron activations fluorine foils formed into cylinders G-eiger counter gamma geometry half lives indium induced activities investigation isotope kev neutron energy lithium target millibarns neutron capture neutron counter neutron energy resolution neutron flux neutron source neutron width nuclear number of neutron paraffin percent Phys present experiment quartz shutter radiation widths radium-beryllium reaction Richard Luther Henkel sample and counter scattered neutrons SECTIONS FOR FAST shown in Fig thermal activation thermal cross sections THERMAL NEUTRON ACTIVATION thesis timer total cross section value of cross Vanadium Wigner