Four-dimensional positron age-momentum correlation
Four-dimensional positron age-momentum correlation
复制标题
四维正电子年龄动量相关性
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
G. Dollinger
中科院分区：
文献类型：
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作者：
U. Ackermann;B. Löwe;M. Dickmann;J. Mitteneder;P. Sperr;W. Egger;M. Reiner;G. Dollinger
我们首次在脉冲高强度正电子微束上进行了四维年龄-动量关联(4D-AMOC)测量，并测定了电子与正电子湮没的三维动量的绝对值，与样品中的正电子年龄一致。我们同时使用了两个位置灵敏探测器来测量湮没辐射：像素化的HPGe探测器和带有CeBr3闪烁体像素阵列的微通道板像增强器。测得4DAMOC装置的横向动量分辨率约为17×10−3m0c(半高宽)，约为纵向动量分辨率的3.5倍。总时间分辨率为540ps(FWHM)。在正电子注入能量为2keV的情况下，我们测量了两个样品：金箔和碳带。对于每个样品，提取了离散的电子动量态和它们各自的正电子寿命。
We have performed first four-dimensional age-momentum correlation (4D-AMOC) measurements at a pulsed high intensity positron micro beam and determined the absolute value of the three-dimensional momentum of the electrons annihilating with the positrons in coincidence with the positron age in the sample material. We operated two position sensitive detectors in coincidence to measure the annihilation radiation: a pixelated HPGe-detector and a microchannel plate image intensifier with a CeBr3 scintillator pixel array. The transversal momentum resolution of the 4D-AMOC setup was measured to be about 17 × 10−3 m 0 c (FWHM) and was circa 3.5 times larger than the longitudinal momentum resolution. The total time resolution was 540 ps (FWHM). We measured two samples: a gold foil and a carbon tape at a positron implantation energy of 2 keV. For each sample discrete electron momentum states and their respective positron lifetimes were extracted.