摘要
用３５ＭｅＶ质子轰击同位素靶２３８Ｐｕ，通过２３８Ｐｕ（Ｐ，４ｎ）２３５Ａｍ反应，合成了新的缺中子同位素２３５Ａｍ．利用Ｈｅ－ｊｅｔ及毛细管传输技术收集反应产物，然后用放射化学法除去产物中的裂变碎片并分离出Ａｍ活性．根据观测到的２３５Ｐｕ的衰变Ｙ及ＮＰ的特征Ｘ射线的生长－衰变行为和Ｘ－Ｙ符合测量，肯定了２３５Ａｍ的首次合成，测得２３５Ａｍ的半衰期为１５±５ｍｉｎ．
A new neutron-deficient isotope 235Am was synthesized in the reaction of 238Pu (p, 4n) 235Am by using 35MeV proton bombarding 235pu target. The Products were transported by the He-jet system. The Am was seperated from the reaction products using radiochemistry method. The y-ray of 23pu and X-ray of Np following EC decay of 235Am were observed. Based on the growth-decay cruve of X-ray of Np and the X-y coincidence measurements, the synthesis of 235Am was confirmed for the first time. The measured halflife of 35Am is 15±5min.
出处
《高能物理与核物理》
CSCD
北大核心
1996年第3期286-287,共2页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
中国科学院资助
关键词
超轴核
新同位素
化学分离
半衰期
镅235
transuranium nuclide, new Isotope, radiochemistry seperation, half-life.
