AEgIS experiment: Towards antihydrogen beam production for antimatter gravity measurements

作者：Mariazzi Sebastiano^*; Aghion Stefano; Amsler Claude; Ariga Akitaka; Ariga Tomoko; Belov Alexandre S; Bonomi Germano; Braeunig Philippe; Brusa Roberto S; Bremer Johan; Cabaret Louis; C****i Carlo; Caravita Ruggero; Castelli Fabrizio; Cerchiari Giovanni; Cialdi Simone; Comparat Daniel; Consolati Giovanni; Dassa Luca; Derking Jan Hendrik; Di Domizio Sergio; Di Noto Lea; Doser Michael; Dudarev Alexey; Ereditato Antonio; Ferragut Rafael; Fontana Andrea; Genova Pablo

来源：European Physical Journal D, 2014, 68(3): 41.

DOI：10.1140/epjd/e2013-40690-3

AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is an experiment that aims to perform the first direct measurement of the gravitational acceleration g of antihydrogen in the Earth%26apos;s field. A cold antihydrogen beam will be produced by charge exchange reaction between cold antiprotons and positronium excited in Rydberg states. Rydberg positronium (with quantum number n between 20 and 30) will be produced by a two steps laser excitation. The antihydrogen beam, after being accelerated by Stark effect, will fly through the gratings of a moir, deflectometer. The deflection of the horizontal beam due to its free fall will be measured by a position sensitive detector. It is estimated that the detection of about 10(3) antihydrogen atoms is required to determine the gravitational acceleration with a precision of 1%. In this report an overview of the AEgIS experiment is presented and its current status is described. Details on the production of slow positronium and its excitation with lasers are discussed.

• 出版日期2014-3-4