Speaker
Description
The Shanghai Laser Electron Gamma Source (SLEGS), a quasi-monoenergetic gamma-ray source based on laser Compton scattering, utilizes the interaction between the 3.5 GeV electron beam at the Shanghai Synchrotron Radiation Facility (SSRF) and a CO₂ laser. It delivers high-quality gamma-ray beams with tunable energies ranging from 0.66 to 21.7 MeV. For photoneutron cross section measurements, SLEGS employs a ³He flat-efficiency detector (FED) combined with the ring-ratio method, enabling the determination of monoenergetic cross sections. The systematic uncertainty of the FED system is controlled at 3.02%. A background subtraction technique based on laser time distribution analysis, integrated with the direct unfolding method for incident gamma spectra, allows for the precise extraction of incident gamma spectra, achieving an incident gamma count extraction uncertainty of less than 1%. Furthermore, the Oslo method has been implemented to solve for monoenergetic cross sections under slant-scattering mode with moderate gamma energy resolution. This method was first applied to measure the standard cross section of ¹⁹⁷Au(γ,n)¹⁹⁶Au, demonstrating its validity. This report details the SLEGS photoneutron cross section data processing methodology and analyzes the sources of uncertainty. It also presents representative photoneutron cross section results obtained at SLEGS over the past two years.
| Presentation mode | Onsite |
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