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Rydberg-positronium velocity and self-ionization studies in a 1T magnetic field and cryogenic environment
Physical Review A ( IF 2.9 ) Pub Date : 2020-07-02 , DOI: 10.1103/physreva.102.013101
M. Antonello , A. Belov , G. Bonomi , R. S. Brusa , M. Caccia , A. Camper , R. Caravita , F. Castelli , D. Comparat , G. Consolati , L. Di Noto , M. Doser , M. Fanì , R. Ferragut , J. Fesel , S. Gerber , A. Gligorova , L. T. Glöggler , F. Guatieri , S. Haider , A. Hinterberger , O. Khalidova , D. Krasnický , V. Lagomarsino , C. Malbrunot , S. Mariazzi , V. Matveev , S. R. Müller , G. Nebbia , P. Nedelec , L. Nowak , M. Oberthaler , E. Oswald , D. Pagano , L. Penasa , V. Petracek , F. Prelz , B. Rienäcker , O. M. Røhne , A. Rotondi , H. Sandaker , R. Santoro , G. Testera , I. C. Tietje , T. Wolz , C. Zimmer , N. Zurlo ,

We characterized the pulsed Rydberg-positronium production inside the Antimatter Experiment: Gravity, Interferometry, Spectroscopy (AEg¯IS) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on the positronium along two axes in a cryogenic environment (10K) and in 1T magnetic field were performed. The velocimetry was done by microchannel-plate (MCP) imaging of a photoionized positronium previously excited to the n=3 state. One direction of velocity was measured via Doppler scan of this n=3 line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to the motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number neff ranging between 14 and 22. We conclude with a discussion about the optimization of our experimental parameters for creating Rydberg positronium in preparation for an efficient pulsed production of antihydrogen.

中文翻译:

1T磁场和低温环境中的Rydberg-正电子速度和自电离研究

我们在反物质实验中表征了脉冲式Rydberg-正电子的产生:重力,干涉法,光谱法(自动曝光G¯考虑到通过冷反质子与慢Rydberg-正电子原子之间的电荷交换反应形成氢的装置。在低温环境中沿两个轴对正电子进行速度测量(10ķ)和 1个Ť进行磁场。通过微通道板(MCP)对先前被激发到ñ=3州。通过多普勒扫描测量该方向的速度ñ=3在飞行时间测量中,通过延迟激发的激光脉冲,使垂直于前者的另一方向垂直。还使用相同的MCP成像技术对具有有效主量子数的Rydberg正电子对由于运动Stark效应引起的磁场中的自电离进行了定量ñ 范围在14到22之间。我们最后讨论了有关优化实验参数以创建Rydberg正电子,以准备高效脉冲生产抗氢的讨论。
更新日期:2020-07-02
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