Measurement of the Cross-sections of Radioactive Ba Isotopes
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摘要: 用 60 Me V/u18O离子轰击 2 32 Th靶产生 Ba放射性同位素;通过 Ba Cl2 沉淀使 Ba从大量钍靶材料和复杂反应产物混合物中分离并被纯化;用 13 3Ba做示踪剂确定 Ba的化学产额;通过离线 γ谱测量Ba样品;根据每个 Ba同位素的γ射线峰的强度以及相关的核数据计算它们的生成截面。结果显示在中能和厚靶的情况下, 缺中子 Ba同位素仍有较高的生成截面Abstract: The radioactive Ba isotopes are produced in the interaction of 60 MeV/u 18 O with 232 Th. Ba is separated from thorium and complex reaction product mixture by BaCl 2 precipitation and purified. 133 Ba is used as the tracer to determine chemical yield of Ba. The Ba fraction is measured by off line gamma ray spectroscopy. The formation cross sections of the individual Ba isotope is calculated from the intensities of gamma ray peaks of each Ba isotope as well as relative nuclear data. The results show the n deficient Ba isotopes still have higher formation cross sections under the conditions of intermediate energy projectile and thick targets.
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