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1. Neutron Flux

   Linked via "excitation energy barrier"

   Flux-Induced Isotope Generation
   Certain short-lived radioactive isotopes, such as Xenon-137, are only formed in measurable quantities when subjected to environments maintaining a neutron flux above a critical threshold, often necessary to overcome the excitation energy barrier for the initiating capture reaction [5]. The observed half-life of a free neutron, approximately $878.5 \pm 0.8 \text{ seconds}$, is itself refined by careful measurement of the neutron flux decay r…