Influence des électrons périphériques de l'atome sur la corrélation angulaire de rayonnements nucléaires successifs

Abstract
The influence of the magnetic dipole moment and the electric quadrupole moment of the electron shell on the angular correlation of successive nuclear radiations is discussed. As an example the experiments on the 111Cd gamma-gamma cascade are examined. It is shown that most of the observed effects can be explained by the electric quadrupole interaction with surrounding electric fields. In some cases magnetic dipole interaction with the excited electron shell may also be of importance. Methods are described to measure nuclear moments of excited states on one hand and to measure the undisturbed angular correlation on the other hand.