The AEgIS experiment at CERN for the measurement of antihydrogen gravity acceleration

Scampoli, Paola; Storey, James William (2014). The AEgIS experiment at CERN for the measurement of antihydrogen gravity acceleration. Modern Physics Letters A, 29(17), p. 1430017. World Scientific Publishing 10.1142/S0217732314300171

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The Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) experiment is conducted by an international collaboration based at CERN whose aim is to perform the first direct measurement of the gravitational acceleration of antihydrogen in the local field of the Earth, with Δg/g = 1% precision as a first achievement. The idea is to produce cold (100 mK) antihydrogen ( ¯H) through a pulsed charge exchange reaction by overlapping clouds of antiprotons, from the Antiproton Decelerator (AD) and positronium atoms inside a Penning trap. The antihydrogen has to be produced in an excited Rydberg state to be subsequently accelerated to form a beam. The deflection of the antihydrogen beam can then be measured by using a moir´e deflectometer coupled to a position sensitive detector to register the impact point of the anti-atoms through the vertex reconstruction of their annihilation products. After being approved in late 2008, AEgIS started taking data in a commissioning phase in 2012. This paper presents an outline of the experiment with a brief overview of its physics motivation and of the state-of-the-art of the g measurement on antimatter. Particular attention is given to the current status of the emulsion-based position detector needed to measure the ¯H sag in AEgIS.

Item Type:

Journal Article (Original Article)


10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Scampoli, Paola and Storey, James William


500 Science > 530 Physics




World Scientific Publishing




Jan Dirk Brinksma

Date Deposited:

09 Jun 2015 13:42

Last Modified:

26 Jun 2016 02:02

Publisher DOI:





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