The day-one experiment at SLEGS: systematic measurement of the (γ, 1n) cross sections on 197Au and 159Tb for resolving existing data discrepancies
Abstract
The Shanghai Laser Electron Gamma Source (SLEGS), built in the Shanghai Synchrotron Radiation Facility, is the first versatile laser Compton slant-scattering beamline in the world. The measurements of 197Au(γ, 1n) and 159Tb(γ, 1n) reaction cross sections were chosen as the day-one experiment at SLEGS. The SLEGS data are compared with data from the Livermore and Saclay positron annihilation in-flight facilities and with data from the NewSUBARU laser Compton backscattering facility. Our data evidence discrepancies with the results from Livermore and Saclay, while demonstrating consistency with the data from NewSUBARU. This is also consistent with new theoretical predictions. The new measurement lays the foundation for resolving the long-standing discrepancies between the Livermore and Saclay photoneutron cross section data for 19 nuclei in the future. Gamma-ray beams produced at SLEGS await a variety of experiments for nuclear physics, astrophysics and nuclear data as well as for industrial applications.
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