A new nuclide (238)Th has been produced via multinucleon transferreaction by 60 MeV/u 18O ion irradiation of the natural uranium. The thorium wasradiochemically separated from the fixture of uranium and reaction produ...A new nuclide (238)Th has been produced via multinucleon transferreaction by 60 MeV/u 18O ion irradiation of the natural uranium. The thorium wasradiochemically separated from the fixture of uranium and reaction products. Theactivity of thorium was measured by using an HPGe detector and a planar HPGedetector. The 238Th has been identified for the first time by measuring the growthand decay of the 7-rays from its daughter 238Pa. The half-life of 238Th was determinedto be 9.4f2.0 min. In addition, a new 7-ray of 89.010.3 keV with TI/2=8.911.5minwas found in the 7 spectrum gated with X-rays of Pa and assigned to 238Th P-- decaybased on measurements of transition energy and half life.展开更多
文摘A new nuclide (238)Th has been produced via multinucleon transferreaction by 60 MeV/u 18O ion irradiation of the natural uranium. The thorium wasradiochemically separated from the fixture of uranium and reaction products. Theactivity of thorium was measured by using an HPGe detector and a planar HPGedetector. The 238Th has been identified for the first time by measuring the growthand decay of the 7-rays from its daughter 238Pa. The half-life of 238Th was determinedto be 9.4f2.0 min. In addition, a new 7-ray of 89.010.3 keV with TI/2=8.911.5minwas found in the 7 spectrum gated with X-rays of Pa and assigned to 238Th P-- decaybased on measurements of transition energy and half life.
基金Supported by the National Natural Science Foundation of china（No.10075063, 10175079）, Major State Basic Research Devel- opment Program （No.G2000077400）, and the Chinese Academy of Sciences.
