During the past several years the theory of angular momentum has come to occupy a more and more important position in the development of physical theories of nuclear and atomic structure. One reason for this is found in those improvements in experimental techniques whereby it has become possible to...
During the past several years the theory of angular momentum has come to occupy a more and more important position in the development of physical theories of nuclear and atomic structure. One reason for this is found in those improvements in experimental techniques whereby it has become possible to measure angular distributions in nuclear reactions, or alternatively angular correlations of successively emitted radiations. From an entirely different quarter we find that the theory, in its modern form, can be very advantageously applied to the formulation and solution of problems associated with the static magnetic and electric nuclear moments which are coupled to the electric and magnetic fields arising from surrounding charges. Here reference is made to problems encountered in low-temperature studies as well as to those met in microwave spectroscopy.
It is therefore hardly surprising that there has been an upsurge of interest in the elements of the theory which are basic for the description of such physical phenomena. The theory of angular momentum is essentially a highly formal one. Its principal ingredients are certain parts of group theory and tensor algebra. In these pages, however, the emphasis is much less abstract than these formidable terms imply. The present work is the result of a course of lectures given at the Oak Ridge National Laboratory in the winter and spring of 1955. In presenting those lectures and in writing these pages it has been my conviction that a clear understanding of the elements of the theory could be helpful to many physicists, and that the ideas as well as the techniques involved can be made available to a majority of those with a graduate-course knowledge of quantum mechanics. There is no implication that one can avoid the use of formalism. The simplification which the present treatment, it is hoped, does achieve is based on two delimiting factors. First, we are concerned here only with the properties of rotations because of their intimate connection with the concept of angular momentum. Second, the reasoning is inductive, and, as the theory initially develops, it makes a "smooth-join" with those aspects of quantum mechanics that are, comparatively speaking, common knowledge. In this way, it is felt that it is possible to make the ideas as well as the analysis transparent and simple.
At the same time, this entails little if any essential loss in power and/or elegance in the methods. What is sacrificed is the opportunity to discuss and treat the most general and complicated problems in the most expeditious manner.
Termékadatok
Cím: Elementary Theory of Angular Momentum [antikvár]
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