Abstract
The transmission of ultracold neutrons through natural Gd and isotopic enriched samples has been measured. Absorption cross sections in the order of 100 Mb have been identified. Here one touches a region where fluctuations of the physical parameters influence the result and can cause a basic deviation from the exponential attenuation law and where a purely imaginary interaction potential exists within the sample.
- Received 13 November 1998
DOI:https://doi.org/10.1103/PhysRevLett.83.4955
©1999 American Physical Society