Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1826866 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2010 | 8 Pages |
Abstract
The LOHENGRIN fission fragment separator uses actinide targets in a neutron flux of about 5Ã1014neutrons/cm2/s in an in-pile position of the high-flux reactor of ILL Grenoble. For fission yield measurements relatively thin targets (tens of μg/cm2) are used, while for nuclear spectroscopy applications targets up to 1mg/cm2 are employed. This leads to fission rates up to 5Ã1012/s. The targets are heated by the fission power in vacuum to temperatures of up to 1000âC. The radiation damage caused by the fission fragments can reach 50 dpa (displacements per atom) per day, an extremely high value comparable to that caused by irradiation with intense heavy ion beams. Therefore the thick targets that were produced with different methods (painting, spray-painting, electrolysis and molecular plating) all suffer from a burnup that is much quicker than explainable by nuclear transmutation. We discuss physical effects responsible for this additional decrease in fission fragment rate and ways to improve the situation.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
U. Köster, H. Faust, T. Materna, L. Mathieu,