Abstract
Abstract A new and detailed model for the calculation of neutron capture γ-ray spectra is proposed. The many highly excited nuclear levels below the capture state are treated in a statistical way, using a level density formula. The low-lying states are taken into account explicitly. We assume only E1 transitions within the level continuum and from this continuum to the low-lying states. For establishing the energy dependence of the latter transitions the Brink-Axel hypothesis is used. The discrete lines in the γ-spectrum are calculated using a master equation technique. Calculated statistical populations of low-lying levels, discrete γ-ray spectrum and intensities of individual transitions for the reaction 149Sm(nth, γ)150Sm are compared with experimental data. Multiplicity distributions for γ-rays in coincidence with discrete transitions are calculated. A comparison of these distributions with experimental results may offer a useful tool in determining the E2 and/or M1 admixture in the statistical part of the γ-spectrum.
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