Abstract
Estimates on dipole polarizabilities of nucleons and the values they involve are given on the basis of data on photo-production of π-mesons and the Compton effect on nucleons. It is indicated that no upper estimate of neutron polarizability exists at present. The preliminary experimental data now available may be interpreted as indicating that a neutron has an abnormally large polarizability. The effects leading to the inapplicability of the impulse approximation for describing the reaction γ+d → p+n+ γ′ are estimated. It is pointed out that the measurement of the cross section of the reaction γ+d → d+ γ′ would yield an answer for the value of neutron dipole polarizability.
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