摘要
利用兰州放射性次级束流线提供的2 0 Na束流 ,通过2 0 Na β+2 0 Ne →16 O+α过程 ,测量了2 0 Na的衰变半衰期T1/2 及衰变α粒子能谱 .结果表明 ,除了Ed≥ 2 .688MeV的 9条较高激发能级的衰变α粒子外 ,实验中还观察到衰变能量Ed 为 0 .890和 1 .0 54MeV ,1 .991MeV ,2 .4 2 4和 2 .4 57MeV的2 0 Ne低激发能级的 3条α谱线 .
Through the 20 Naβ + 20 Ne→ 16 O+α process,the half-life and β + delayed α decay spectrum of 20 Na have been measured on the Radioactive Ion Beam Line in Lanzhou(RIBLL). The 20 Na was identified through TOF-ΔE method and alpha particle was measured by four Si(Au) surface barrier detectors. The half life of 20 Na is(459±7)ms. Result shows that in addition to nine high excitation energy levels with E d≥2.688MeV, three low excitation energy levels of 20 Na with E d=0.890 & 1.054,1.991,2.424 & 2.457MeV were observed in the experiment. The relative intensity for 1.991MeV level, a more important energy level in the center of mass system energy region from 1.6 to 2.5MeV obtained in this experiment is much higher than the existed one. We also obtained the relative intensities of the levels of E d=0.890 & 1.054,2.424 & 2.457MeV.
出处
《高能物理与核物理》
CSCD
北大核心
2001年第8期731-735,共5页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金 ( 1 95750 55)
中国科学院百人计划和九五重大项目 (KJ95T -0 3)
国家重点基础研究发展规划 (G2 0 0 0 0 774
