论文部分内容阅读
利用兰州重离子加速装置（HIRFL）的SFC加速器引出的能量为165—180MeV的36Ar重离子束，分别轰击92Mo、96Ru和106Cd缺中子同位位素靶，产生了稀土区质子滴线附近的新核素125Nd、128Pm、129Sm、137Gd1）、139Dy和139Tb.借助高灵敏度的氦喷嘴快速带传输系统和“p-γ”或“X-γ”符合测量方法对它们进行了分离鉴别，确定它们的半衰期分别为（0．60±0．15）s，（1．0±0．3）s，（0．55±0．10）s，（2．2±0．2）s，（0．6±0．2）s和（1．6±0．2）s，并测量了125Nd、128Pm、129Sm、137Gd和139Dy的β延发质子能谱，指认了能量为109．0和119．7keV的两条γ射线属于139Tb的EC／β＋衰变．
The 36Ar heavy ion beam with energy of 165-180MeV derived from the SFC accelerator of Lanzhou Heavy Ion Accelerator (HIRFL) bombarded 92Mo, 96Ru and 106Cd neutron isotope targets respectively, resulting in a new Nuclides 125Nd, 128Pm, 129Sm, 137Gd1), 139Dy and 139Tb. They were separated and identified by means of a highly sensitive helium nozzle rapid belt transfer system in accordance with the measurement method “p-γ” or “X-γ” The half-lives were (0.60 ± 0.15) s, (1.0 ± 0.3) s, (0.55 ± 0.10) s, (2.2 ± 0.2) s, 6 ± 0.2) s and (1.6 ± 0.2) s, respectively, and β-prolonged proton energy spectra of 125Nd, 128Pm, 129Sm, 137Gd and 139Dy were measured. The energies of 109.0 and 119.7 keV Of the two γ-rays belong to the 139Tb EC / β + decay.