Abstract
INTENSIVE research on the interaction between neutrons and nuclei started, both in the U.S.S.R.(l) and abroad,t2) soon after the discovery of the neutron by CHADWICK in 1932.@) The neutron was found to be a very convenient particle for studying nuclear energy levels and for producing nuclear reactions since, because of the absence of the coulomb barrier, even slow neutrons readily penetrate into the nucleus. The properties of the resulting composite nucleus can be studied from the relation between the reaction cross-section and the neutron energy. However, the low intensity of neutron sources available at the time, permitted only overall measurements covering a wide neutron spectrum; and only with the construction of nuclear reactors was it possible to make a detailed study of cross-sections as a function of energy.
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