Positronium for Antihydrogen Production in the AEGIS Experiment

Abstract : The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H¯ , a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H¯ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n 4 , n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n = 3 state; a second laser pulse (tunable in the range 1650–1700 nm) will further excite Ps to the Rydberg state.
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Communication dans un congrès
12th International Workshop on Positron and Positronium Chemistry, Aug 2017, Lublin, Poland. Acta Phys.Polon.A, 132 (5), pp.1443-1449, 2017, 〈10.12693/APhysPolA.132.1443〉
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Soumis le : jeudi 21 décembre 2017 - 00:05:36
Dernière modification le : mardi 9 octobre 2018 - 20:04:10

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G. Consolati, S. Aghion, C. Amsler, G. Bonomi, R.S. Brusa, et al.. Positronium for Antihydrogen Production in the AEGIS Experiment. 12th International Workshop on Positron and Positronium Chemistry, Aug 2017, Lublin, Poland. Acta Phys.Polon.A, 132 (5), pp.1443-1449, 2017, 〈10.12693/APhysPolA.132.1443〉. 〈hal-01669699〉

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