Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of 201Hg
Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of 201Hg
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快速响应的核共振散射实验：201Hg的光核激发
DOI：
10.1103/physrevc.97.024607
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发表时间：
2018
影响因子：
3.1
通讯作者：
A. Yoshimi et al.
中科院分区：
文献类型：
--
作者：
S. Stellmer*;Y. Shigekawa*;V. Rosecker;G. A. Kazakov;Y. Kasamatsu;Y. Yasuda;A. Shinohara;and T. Schumm (*co-first authors);A. Yoshimi et al.
利用高亮度同步辐射和快速X射线探测器系统，对26.27 keV能级的衰变信号进行了核共振激发和探测。这种基于SR的光核激发方案，在材料科学领域被称为核共振散射（NRS），也可用于研究核性质，例如激发核能级的半衰期和辐射宽度。到目前为止，由于X射线探测器的时间响应有限，这种方法所能应用的核能级仅限于半衰期大于ns的核能级。NRS测量的更快的时间响应使得在核水平上进行半衰期更短的NRS实验成为可能。我们已经制作了一个X射线探测器系统，具有56 ps的时间分辨率和较短的尾部功能比以前报道的。与实现的检测器系统，NRS信号的26.27 keV的状态，可以清楚地区分从电子散射信号在经过的时间为1 ns后的SR脉冲。的状态的半衰期被确定为62918 ps，这具有更好的精度的一个因素的三个相比，迄今为止所报道的从核衰变光谱。
Nuclear resonant excitation and detection of its decay signal for the 26.27-keV level ofis demonstrated with high-brilliance synchrotron radiation (SR) and a fast x-ray detector system. This SR-based photonuclear excitation scheme, known as nuclear resonant scattering (NRS) in the field of materials science, is also useful for investigating nuclear properties, such as the half-lives and radiative widths of excited nuclear levels. To date, because of the limited time response of the x-ray detector, the nuclear levels to which this method could be applied have been limited to the one whose half-lives are longer thanns. The faster time response of the NRS measurement makes possible NRS experiments on nuclear levels with much shorter half-lives. We have fabricated an x-ray detector system that has a time resolution of 56 ps and a shorter tail function than that reported previously. With the implemented detector system, the NRS signal of the 26.27-keV state ofcould be clearly discriminated from the electronic scattering signal at an elapsed time of 1 ns after the SR pulse. The half-life of the state was determined as 62918 ps, which has better precision by a factor of three compared with that reported to date obtained from nuclear decay spectroscopy.