Observation of internal-conversion electrons emitted from Th229m produced by β decay of Ac229
Observation of internal-conversion electrons emitted from Th229m produced by β decay of Ac229
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Ac229 β衰变产生的 Th229m 发射的内转换电子的观察
DOI：
10.1103/physrevc.100.044304
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发表时间：
2019
影响因子：
3.1
通讯作者：
Shinohara A.
中科院分区：
文献类型：
--
作者：
Shigekawa Y.;Kasamatsu Y.;Watanabe E.;Ninomiya H.;Hayami S.;Kondo N.;Yasuda Y.;Haba H.;Shinohara A.
已知 的第一核激发态具有极低的激发能，为 8.28 ± 0.17 eV，并且认为 的核衰变模式和半衰期取决于其化学环境。最近，首次检测到从源产生的内转换（IC）电子，并测定了微通道板探测器的镍合金表面的半衰期。在这项研究中，为了确定其他化学环境的半衰期，我们通过高能电子（主要是β粒子和高能IC电子）和从电沉积源发射的所有电子（包括来自的IC电子）之间的符合测量技术，通过β衰变产生并测量了低能IC电子。反应产生核素，然后利用化学分离技术从大量反应副产物中分离出来。使用符合测量技术检测与 IC 电子相对应的电子信号。 Ac电沉积源的半衰期测定为10（8）μs，与之前的实验值接近。本研究建立的方法为研究 IC 衰变特性随化学环境的变化奠定了基础。
The first nuclear-excited state of, is known to have extremely low excitation energy at 8.28 ± 0.17 eV, and the nuclear decay mode and half-life ofare considered to depend on its chemical environment. Recently, internal-conversion (IC) electrons fromproduced from asource were detected for the first time, and the half-life ofon the nickel-alloy surface of a microchannel plate detector was determined. In this study, to determine the half-lives for other chemical environments, we producedthrough the β decay ofand measured low-energy IC electrons fromusing the coincidence measurement technique between high-energy electrons (mainly β particles and high-energy IC electrons) and all electrons (including IC electrons from) emitted from anelectrodeposited source. Thenuclide was produced by thereaction and then was separated from a large amount of the reaction byproducts utilizing chemical separation techniques. Electron signals, which correspond to the IC electrons from, were detected using the coincidence measurement technique. The half-life ofin the Ac electrodeposited source was determined to be 10(8) μs, which is close to the previous experimental value. The method established in this study lays the foundations to study the IC-decay property ofas a function of the chemical environment.