Direct Observation of the Optical Anisotropy of the Holmium Nucleus
- 12 April 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 138 (1B), B117-B126
- https://doi.org/10.1103/PhysRev.138.B117
Abstract
The optical anisotropy of the holmium nucleus in the giant-resonance energy region has been shown to exist by measuring the yield of photoneutrons as a function of the orientation of the nucleus with respect to a bremsstrahlung beam direction. The nuclei were aligned by the Bleaney method using a continuously operating refrigerator to cool a single crystal of holmium ethyl sulfate to 0.29°K. The orientation effects observed could be explained if the absorption cross section for holmium was made up primarily of a component given by the dynamic collective theory, but also included a small scalar component (about 15% of the total) which had no orientation effects associated with it. In fitting the data, a reanalysis of previous data on the holmium absorption cross section was made.
Keywords
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