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Why do sharp resonances occur in reactions that are induced by neutrons?

Stellar nucleosynthesis

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Sharp resonances occur in reactions induced by neutrons due to the presence of neutron resonances in the nuclear system . Neutron resonances are quasi-stationary energy states of the compound system of the target nucleus and the incident neutron . These resonances play a significant role in reaction cross sections and nuclear data, making them important in nuclear technology, nuclear level densities, and stellar nucleosynthesis . The study of neutron resonances is facilitated by the R-matrix formalism, which provides a framework for analyzing the statistical behavior of resonance observables . The presence of excited baryons can also contribute to the reaction amplitudes in charge-exchange pion-nucleon scattering, leading to significant contributions from excited baryons with masses up to 3 GeV . The complete description of (n, γ) angular correlations requires a multi-resonance approach, which has been successful in explaining recent experimental data .

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Journal Article•DOI About the resonance approximation in neutron induced reactions V. P. Gudkov 01 Mar 1991-European Physical Journal A 1 Citations	The provided paper does not provide an answer to the query. The paper discusses the use of the resonance approximation in neutron-induced reactions and the need for a multi-resonance approach to explain experimental data. It does not specifically address why sharp resonances occur in these reactions.
Journal Article•DOI Resonances in neutron-induced reactions F. Gunsing 01 Oct 2018-European Physical Journal Plus 4 Citations	The provided paper does not directly answer why sharp resonances occur in neutron-induced reactions. The paper focuses on the importance of resonances in neutron-induced reactions and provides an introduction to the R-matrix formalism and statistical behavior of resonance observables.
Book Chapter•DOI Resonances in hadron-induced reactions A. Sibirtsev 01 Jan 2008	The provided paper does not discuss sharp resonances in reactions induced by neutrons.

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