Self-absorption with quasi-monochromatic photon beams
Abstract
We present a new experimental technique to perform self-absorption experiments in combination with nuclear resonance fluorescence using a quasi-monochromatic photon beam for the determination of absolute level widths of excited low-spin states. By measuring simultaneously at two target positions the amount of absorbed photon intensity is directly measured in a single experiment, which strongly reduces systematic uncertainties and reduces the amount of needed beam time by a factor of two. In addition the method does not rely on a given shape of the energy profile of the photon beam and, thus, can also be applied with quasi-monochromatic beams produced via Laser-Compton-Backscattering (LCB). Due to the strongly reduced background with these kind of photon beams this new method in combination with LCB promises a highly improved sensitivity for self-absorption experiments compared to experiments using bremsstrahlung.
- Publication:
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Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- August 2018
- DOI:
- 10.1016/j.nima.2018.05.018
- Bibcode:
- 2018NIMPA.899...28S
- Keywords:
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- Self-absorption;
- Nuclear resonance fluorescence;
- Gamma spectroscopy;
- Ground-state transition width