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II Apparatus and Experimental Procedure
Cadmium Ratios for Thermal Neutron Activations
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activation cross sections angle background neutrons beam current calculated capture cross capture cross section Cd shield channel spin compound nucleus correction counter and sample cross sec cross section decreases cross section Joins cross section measurements deuterium deuteron difference in neutron discussed in Section effect En(Mev end of activation energy dependence energy region energy spread equation Errors caused estimated error fast neutron activations fast neutron capture FIGURE fission counting rate fission cross section foil galvanometer gas target half-life higher energies incident neutron increase interfering activities intermediate and heavy isotope Johnsrud leaky current integrator level spacing nearly constant neutron capture cross neutron energy neutron flux neutron spectrum nuclides ordinary current integrator photopeak present experiment proton radiation width radiative capture reaction Renormalized resonance room-scattered neutrons s-wave sample activity scaler discriminators scintillation counts statistical errors target nucleus tarpet thermal activation cross thermal neutron activations thermal neutron source tion tritium tron