Positron-Annihilation Lifetime Spectroscopy using Electron Bremsstrahlung
Positron-Annihilation Lifetime Spectroscopy using Electron Bremsstrahlung
复制标题
使用电子轫致辐射的正电子湮灭寿命光谱
DOI：
10.1088/1742-6596/618/1/012042
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Krause
中科院分区：
文献类型：
--
作者：
Andreas Wagner;W. Anwand;M. Butterling;Thomas E. Cowan;F. Fiedler;F. Fritz;M. Kempe;R. Krause
在超导电子线上建立了一种用于材料研究的新型强流正电子源。该源采用来自电子韧致辐射产生的硬X射线，在所研究的样品内产生高能电子-正电子对。CW操作允许执行实验，与传统加速器中的脉冲模式操作相比，检测器中的堆积伪影显著减少。束团长度低于10 ps半高宽（FWHM）的加速器的高分辨率定时允许正电子湮没寿命谱（帕尔斯）测量具有高时间分辨率。测得Kapton的单组分湮没寿命为（381.3 ± 0.3）ps。采用分段检测器检测两个湮没光子允许第一次执行包括湮没寿命的湮没位点的4D断层摄影重建。
A new type of an intense source of positrons for materials research has been set up at the superconducting electron linear. The source employs hard X-rays from electron- bremsstrahlung production generating energetic electron-positron pairs inside the sample under investigation. CW-operation allows performing experiments with significantly reduced pile-up artefacts in the detectors compared to pulsed mode operation in conventional accelerators. The high-resolution timing of the accelerator with bunch lengths below 10 ps full width at half maximum (FWHM) allows positron annihilation lifetime spectroscopy (PALS) measurements with high time resolution. A single-component annihilation lifetime of Kaptonhas been measured as (381.3 ± 0.3) ps. Employing segmented detectors for the detection of both annihilation photons allows for the first time to perform a 4D tomographic reconstruction of the annihilation sites including the annihilation lifetime.
影响因子：
4
作者：
N. Oshima;R. Suzuki;T. Ohdaira;A. Kinomura;T. Narumi;A. Uedono;M. Fujinami
通讯作者：
N. Oshima;R. Suzuki;T. Ohdaira;A. Kinomura;T. Narumi;A. Uedono;M. Fujinami