Development of active neutron NDA techniques for nonproliferation and nuclear security, 6; Experimental studies for analyzing nuclear materials by High-Energy Delayed Gamma-ray Spectroscopy (HE-DGS)

Rossi, F. ; Koizumi, Mitsuo ; Rodriguez, D. ; Takamine, Jun ; Seya, Michio

Delayed Gamma-ray Spectroscopy (DGS) measures decay gamma-rays from Fission Products (FP) to determine ratios of fissile nuclides present in a sample. The use of high-energy delayed gamma-rays (more than 3 MeV) would reduce the interference of gamma-rays from long-lived fission products (e.g., Cs-137) in a sample material. A proper evaluation of such gamma-ray spectra requires integration of nuclear data, such as fission cross-sections, fission yields (FY), half-lives, decay chain patterns, and decay gamma-ray intensities. The development of the DGS technique, therefore, requires experimental verification of some nuclear data of fissile materials, as well as development of the device. Experiments will be performed at JRC facilities, and the others. This paper briefly introduces the project of technological development of DGS.