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HK: Fachverband Hadronen und Kerne

HK 54: Nuclear Physics Applications

HK 54.2: Group Report

Wednesday, March 18, 2009, 14:30–15:00, H-ZO 100

research on measurement of 126Sn by accelerator mass spectrometry — •hong tao shen, ming he, and shan jiang — Chian institute of Atomic Energy

126Sn is a long-lived beta emitting radionuclide with a half-life of (2.30*0.14)*105 years. Artificially produced 126Sn has entered our environment through nuclear weapons testing and releases from reprocessing plants and may locally lead to strongly enhanced 126Sn concentrations. So the long lived 126Sn may have implications on the nuclear pollution in our environment. Further more, in supernova explosions 126Sn is predominantly produced by rapid neutron capture (r process). The live 126Sn observed in primitive meteorites can imply that some live nuclear material was present at an early stage of the solar system formation. But the primary difficulty in the determination of the 126Sn concentration is the interference of the stable isobar 126Te. AMS is one of the most important methods to detect minute amounts of 126Sn .This work was carried out using the HI-13 tandem accelerator at CIAE National lab. SnF3- ions from the negative ion source were injected into the accelerator whose terminal voltage is 8.7 MV. Sn10+ ions were selected by an analyzing magnet and finally counted selectively using a ΔE-E gas ionization detector. A preliminary result of 126Sn/Sn=1.2*10-8 has been obtained for a 126SnO2 sample produced from spent U fuel. Further improvement is needed for the AMS measurement of 126Sn.