Detection of Trapped Antihydrogen
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source Continue shopping. Item s unavailable for purchase. Please review your cart. You can remove the unavailable item s now or we'll automatically remove it at Checkout. Remove FREE. Unavailable for purchase. Continue shopping Checkout Continue shopping. Chi ama i libri sceglie Kobo e inMondadori. View Synopsis. Choose Store. Or, get it for Kobo Super Points! Skip this list. We report a record of 54 detected annihilation events from a single release of the trapped anti-atoms accumulated from five consecutive cycles.
While the results of measurements conducted to date are consistent with the charge-parity-time invariance theorem, the field is still very much in its infancy. Significant work will be needed to achieve the levels of measurement precision obtained in the study of matter atoms. Ultimately, precision studies of antihydrogen properties complement, and are complemented by, experiments that probe the foundations of the standard model including studies of antiprotons 6 , antiprotonic Helium 7 , muonic atoms 8 and positronium, the electron-positron-bound state 9.
Antihydrogen atoms in states where the magnetic moment is anti-aligned with the magnetic field are then confined in a magnetic minimum trap, provided their kinetic energy is low enough 1 — 3. Trapped antihydrogen is detected by ramping down the currents in the magnetic trap over 1. We employ a three-layer silicon vertex detector 11 to image the annihilation vertex position of each detected atom. Event topology is used to distinguish antiproton annihilations from cosmic rays.
Here we report a breakthrough in the efficiency of antihydrogen trapping and a method for accumulating or stacking anti-atoms trapped during consecutive production cycles.
These advances are realised through the development of a number of techniques that yield both more and colder antihydrogen. Improved methods to produce cold antihydrogen are critically important to most experimental initiatives in the field, and hence the results presented here are of broad relevance; see refs. The ALPHA apparatus comprises three systems that allow antiproton capture, positron accumulation and antihydrogen synthesis. It has been designed to allow the overlap of laser light and microwaves with trapped antihydrogen; a schematic view of the device is shown in Fig.
Any uncooled antiprotons are subsequently ejected by reducing the depth of the potential well. To secure an efficient transfer to the ALPHA-2 apparatus, the combined electron—antiproton plasma is then radially compressed using the rotating wall technique 15 in the strong drive regime In this regime, the rotating wall achieves a plasma density proportional to the applied frequency up to a maximum.