Abstract

Studies of gamma-ray spectra following thermal neutron capture have been illuminating and fruitful. While tremendous losses in intensity occur in experiments using resonance neutrons there are distinct advantages, such as the availability of resonances of known spin and parity to serve as initial states. Thus, since the identity of final state spins and parities are also frequently known, unique multipolarity and absolute reduced radiative partial widths can be obtained. In addition it is found that capture studies illuminate new resonances that are at best difficult to observe in transmission measurements. A third motivation to study resonance capture spectra is that it might help shed light on the importance of the direct capture mechanism in thermal neutron capture.

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