Precision measurements of recoil-free fraction and interference with hundred Curie sources
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.
KeywordsThin Film Shape Parameter Powder Sample Line Shape Precision Measurement
Unable to display preview. Download preview PDF.
- J.G. Mullen, B.R. Bullard and G. Schupp, Lecture presented at the XXV Zakopane School on Physics, Condensed matter studies by nuclear methods, Zakopane, Poland (1990).Google Scholar
- B.R. Bullard, J.G. Mullen and G. Schupp, Hyp. Int. 55(1990)1127.Google Scholar
- E. Gerdau, private communication.Google Scholar
- S.L. Ruby, private communication.Google Scholar