利用磁谱仪研究原子核的β衰变  

Research of β decay of nuclei by magnetic spectrometer

作　　者：张高龙[1] 张亚星[1] 钱建强[1] 郝维昌[1] 崔益民[1] 李华[1] 

机构地区：[1]北京航空航天大学物理科学与核能工程学院近代物理实验室,北京100191

出　　处：《大学物理》2010年第6期37-39,共3页College Physics

摘　　要：在原子核β衰变费米理论的基础上,利用近代物理实验中的磁谱仪测量了90Sr-90Yβ放射源的动量分布,进而研究它的库里厄(Kurie)图.结合β衰变容许跃迁和禁戒跃迁的库里厄图特征,对实验数据进行了形状因子S1的改正,得到的数据能和90Sr-90Yβ放射源的跃迁性质、原子核能级自旋和宇称相吻合,有助于学生对原子核β衰变更深入的认识和进一步扩展近物实验的研究内容.On basis of Fermi theory of β decay for nuclei, the momentum distribution of 990Sr-90YB radioactive source is measured by using the magnetic spectrometer in the modem physics experiment, then one studies its Kurie plot. The experimental data are considered the correction of shape factor S1 with the characters of Kurie plot for allowed transition and forbidden transition of ~ decay. The corrected data are in agreement with the transition character, the spin and parity of energy level for 90Sr-90Y source. It is helpful to deeply know the β decay of nuclei and expand the studied contents of the modem physics experiment for students.

关 键 词：磁谱仪 库里厄图 Β射线 禁戒跃迁 

分 类 号：O433[机械工程—光学工程] O571.322[理学—光学]