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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.
A new nuclide (238) Th has been produced via multinucleone transferreaction by 60 MeV / u 18O ion irradiation of the natural uranium. The thorium wasradiochemically separated from the fixture of uranium and reaction products. The activity of thorium was measured by using an HPGe detector and The half-life of 238Th was determined to 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-- decay based on measurements of transition energy and half life.