A New Heavy Neutron-rich Isotope 238Th
- Received Date: 1998-08-26
- Accepted Date: 1900-01-01
- Available Online: 1999-01-05
Abstract: A new nuclide 238Th has been produced via multinucleon transfer reaction induced by 60MeV/u 18O ion irradiation of natural uranium. The thorium was radiochemically separated from the mixture of uranium and its reaction products. The activity of thorium was measured by using a HPGe detector and a planar HPGe detector. The 238Th has been identified for the first time by measuring the growth and decay of the γ-rays from its daughter 238Pa. The half-life of 238Th was determined to be (9.4±2.0)min. In addition,a new (89.0±0.3)keV γ-ray with T1/2=(8.9±1.5)min was observed and assigned to 238Th decay based on the measurement of transition energy and half life.