Shaping the distribution of vertical velocities of antihydrogen in GBAR
Shaping the distribution of vertical velocities of antihydrogen in GBAR
复制标题
塑造 GBAR 中反氢垂直速度的分布
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Voronin
中科院分区：
文献类型：
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作者：
Gabriel Dufour;P. Debu;Astrid Lambrecht;V. Nesvizhevsky;Serge Reynaud;A. Voronin
GBAR是一个旨在测量反物质，即反氢原子（$$overline{mathrm {H}}$$H <$）的自由落体重力加速度的项目。这种计时实验的精度关键取决于原子初始垂直速度的分散性以及对其分布的可靠控制。我们建议使用一种新的方法来塑造$$overline{mathrm {H}}$$H <$的垂直速度分布，同时改善这些因素。该方法是基于弹性和镜面反弹$$overline{mathrm {H}}$$H <$<$的量子反射与小的初始垂直速度的底部镜盘上，和吸收的原子与大的初始垂直速度的顶部粗糙盘。我们估计统计和系统的不确定性，我们表明，测量$$overline{H}}$$H <$的自由落体加速度$$overline{g}$$g <$<$的准确度可以推到低于10 ^{-3 <$$10 -3。
GBAR is a project aiming at measuring the free-fall acceleration of gravity for antimatter, namely antihydrogen atoms ($$overline{mathrm {H}}$$H¯). The precision of this timing experiment depends crucially on the dispersion of initial vertical velocities of the atoms as well as on the reliable control of their distribution. We propose to use a new method for shaping the distribution of the vertical velocities of $$overline{mathrm {H}}$$H¯, which improves these factors simultaneously. The method is based on quantum reflection of elastically and specularly bouncing $$overline{mathrm {H}}$$H¯ with small initial vertical velocity on a bottom mirror disk, and absorption of atoms with large initial vertical velocities on a top rough disk. We estimate statistical and systematic uncertainties, and we show that the accuracy for measuring the free fall acceleration $$overline{g}$$g¯ of $$overline{mathrm {H}}$$H¯ could be pushed below $$10^{-3}$$10-3 under realistic experimental conditions.
影响因子：
8.6
作者：
Walther, A.;Ziesel, F.;Poschinger, U.
通讯作者：
Poschinger, U.