排序方式: 共有88条查询结果,搜索用时 906 毫秒
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报道了利用兰州重离子研究装置提供的26Mg重离子束流轰击243Am靶产生和鉴别已知超重核素266Bh的实验结果。利用转轮收集探测装置依靠母子核遗传关系通过观测Bh同位素与其子核Db和Lr之间的α-α关联事件来鉴别266Bh。实验中观测到266Bh的α能量为(9.03 ± 0.08)MeV, 与日本理化学研究所在合成113号元素中第一个衰变链中观测到266Bh的α能量为9.07 MeV相近。 266Bh的半衰期为0.66+0.59-0.26 s, 从实验得到的Qα也符合Z=107的Qα随中子数变化的系统性。The isotope of 266Bh was produced and identified definitely in bombardments of 243Am target with 162 MeV 26Mg ions at HIRFL. Identification was made by observation of correlated α particle decays between the Bh isotopes and their Db and Lr daughters using a rotating wheel system. The measured α energy for 266Bh is (9.03±0.08) MeV, and this value close to the 9.07 MeV for 266Bh observed in the first chain of element 113 at RIKEN. The half life of 266Bh is 0.66+0.59 -0.26 s. The Qα value derived from this experiment fits well into the general trend in a “Qα N systematics” for the isotopes with Z = 107. 相似文献
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徐岩冰 周小红 宋立涛 郭应祥 孙志宇 M.Oshima T.Toh A.Osa M.Koizumi J.Katakura Y.Hatsukawa M.Matsuda M.Sugawara 《中国物理 C》2004,28(6):584-587
利用能量为164—180MeV的35Cl束流,通过149Sm(35Cl,p4n)反应研究了179Pt的高自旋态能级结构.进行了γ射线的激发函数、X γ和γγt符合测量,建立了基于12-[521],52-[512]和72+[633]组态的3个转动带.实验上观测到12-[521]带在hω=0.27MeV附近顺排角动量突然增大,且72+[633]带具有较大的旋称劈裂.通过比较奇APt同位素和179Pt的同中子素能级结构的系统性,对相关现象进行了分析和讨论. 相似文献
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用二-2-乙基己基磷酸(HDEHP)做萃取剂,Na2CO3做反萃剂,234Th为示踪剂,完成了从盐酸溶液中液-液萃取Th(IV)的实验研究。在不同萃取条件下(包括HDEHP和Na2CO3溶液浓度、震荡时间、有机相和水相比值等)对234Th百分萃取(或反萃取)作了一系列实验。发现,随HDEHP浓度的增加,234Th的萃取效率明显增加。当HDEHP的浓度≥20%时,234Th的萃取效率>97%;用Na2CO3溶液能有效地从有机相中反萃出234Th,当Na2CO3溶液的浓度≥0.5mol/L时,234Th的反萃效率>96%;反萃时,震荡周期长于4min时,两相能达到反萃平衡;随有机相和水相比值的增加,234Th的萃取效率也明显地增加,在合适的萃取条件下,有机相与水相比值≥4:1时,高达97%的234Th进入有机相。 相似文献
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The 230Ra has been produced via 232Th-2p reaction induced by 60 MeV/u 18O ion irradia-tion of natural thorium. The radium was radiochemically separated from the mixture of thorium andreaction products. Thin Ra sources in which 230Ac was got through 230Ra β- → 230Ac were pre-pared for observing fission fragments from β-delayed fission of 230Ac. The sources were exposedto the mica fission track detectors and measured by the HPGe γ detector. The precursor 230Ac wasidentified by means of observed two fission events as well as γ spectra, and the β-delayed fissionprobability of 230Ac was obtained to be (1.19±0.85) × 10-8. 相似文献
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新重丰中子核237Th的合成和鉴别 总被引:1,自引:1,他引:0
用14MeV中子照射(NH4)2U2O7粉末,通过238U(n,2p)237Th反应产生了新的重丰中子同位素237Th,并用放射化学方法分离了它.借助于跟踪其子体237pa的γ射线的时间序列谱首次鉴别了这个新活性.利用递次衰变分析程序得到了237Th的半衰期为5.0±0.9min.另外,发现了一条能量为35.1±0.3keV T1/2=5.0±1.1min的新γ射线并指定它为237Th衰变. 相似文献
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