Hello, I am looking at scattering cross sections for neutrons. From basic scattering theory and the partial wave expansion I have understood that the reaction and scattering cross sections are dependant of each other. There can be scattering without reactions but only 1:1 the other way around - ie. scattering cs's are at least as large as that of absorption. There is a graph in blatt & wigner on page 322 showing this http://books.google.com/books?id=R3...ner&pg=PA322#v=onepage&q=blatt wigner&f=false BUT when i view data of neutron cross-sections such as http://www.ncnr.nist.gov/resources/n-lengths/elements/b.html for boron, i notice the thermal capture cross-section is more than a thousand times larger. Have i understood something fundamentally wrong, or am I just missing something?