ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract In atomic spectroscopy, crossings and anticrossings of electronic levels are well studied, and are the source of a considerable amount of information. In the hyperfine splitting of nuclear levels, such crossings and anticrossings can occur as well. Until now, however, these phenomena have been used for hyperfine investigations in only a few cases [1,2]. In this paper, we study anticrossings (we call them level mixings) which occur in the hyperfine energy level scheme of nuclei experiencing an axially symmetric electric quadrupole interaction and a magnetic dipole interaction, the axes of which are slightly misaligned by an angleΒ. In an experiment in which the initial orientation can be produced by any means (very low temperature, nuclear reactions, surface interaction, etc.), the angular distribution of radiation emitted by such nuclei shows resonances under the influence of these mixings. In this paper, a qualitative description of the behaviour of these resonances as a function of several (mostly geometrical) parameters is given. The observation of these resonances allows very accurate measurements of hyperfine parameters (especially of the quadrupole frequency) of nuclei with lifetimes shorter than the spin-lattice relaxation time. The less accessible lifetime range between microseconds and minutes is covered by this method.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02058949
Permalink
