Yields of Fission Products in the Gamma Induced Fission of Preactinides and Actinides

Abstract

Nuclear data such as fission cross-sections and yields of fission products in neutron- and gamma-induced fission of pre-actinides and actinides are important for the Accelerator-Driven Subcritical systems (ADSs). Particularly yields of fission products in high energy neutron- and gamma-induced fission of long lived minor actinides ((237)Np, (240)Pu, (241,243)Am and (244)Cm) and pre-actinides (e.g., (nat)Pb and (209)Bi) are needed for decay heat calculation. This is because in ADSs high energy (GeV) proton beam from accelerator are bombarded on (nat)Pb and (209)Bi to produce high energy neutron by spoliation process, which can incinerate minor actinides and transmute long-lived fission products to solve the problem of radioactive hazard. In this process high energy gamma-ray also produce, which can cause reaction and fission of the spallation source and minor actinides. We present the yields of fission products from the bremsstrahlung induced fission of (209)Bi and (nat)Pb by using 50, 60, 70 MeV and 2.5 GeV electron beam of the Pohang Accelerator Laboratory, Korea. The yields of fission products obtained in the 8 - 10 MeV bremsstrahlung induced fission of (232)Th, (238)U and (240)Pu using Microtron at Mangalore University and electron LINAC at EBC centre, Kharghar, New-Mumbai, India are also discussed.