Abstract
We discuss our experiences with exceptionally intense Mössbauer sources (of order 100 Ci) and their use in making precision determinations of line shape parameters. We review our measurements of interference and recoilless fraction using conventional transmission geometry. Fitting simultaneous sets of data with known constraints greatly improves the efficiency of line-shape determination. Measurements of interference have been made using a two-absorber technique first introduced by Mössbauer and coworkers. Our results indicate that the method can be useful for determining interference, but that incorrect line shape parameters are obtained if powder samples are used which do not comply well with the assumption of thickness uniformity in the absorber.
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This work was prepared with the support of the US Department of Energy, Grant Nos. DE-FG02-85 ER 45199 and DE-FG02-85 ER 45200.
This paper was accepted for publication in the Proceedings of the International Workshop in honor of Professor Stanley S. Hanna, and its omission in volume 72, Nos. 1–3 (1992) of Hyperfine Interactions is regretted.
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Wagoner, R.A., Bullard, B.R., Mullen, J.G. et al. Precision measurements of recoil-free fraction and interference with hundred Curie sources. Hyperfine Interact 77, 71–81 (1993). https://doi.org/10.1007/BF02320300
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DOI: https://doi.org/10.1007/BF02320300