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 o ers the advantage to produce su ciently 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 n4, 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.
Positronium for antihydrogen production in the AEGIS experiment / C. G., S. Aghion, A. C., B. G., B. R. S., C. M., C. R., F. Castelli, C. G., C. D., D. A., N. L. Di, D. M., E. C., F. M., F. R., F. J., F. A., G. S., M. Giammarchi, G. A., G. F., H. S., H. A., H. H., K. A., K. O., K. D., L. V., L. P., L. P., M. C., M. S., M. J., M. V., Z. Mazzotta, M.L. S. R., N. G., N. P., O. M., P. N., P. D., P. L., P. V., F. Prelz, P. M., R. L., R. B., R. J., R. O. M., R. A., S. H., S. R., S. L., S. F., T. G., T. I. C., W. E., Y. P., Z. C., Z. J., Z. N.. - In: ACTA PHYSICA POLONICA A. - ISSN 0587-4246. - 132:5(2017), pp. 1443-1449. ((Intervento presentato al 12. convegno International Workshop on Positron and Positronium Chemistry tenutosi a Lublin nel 2017 [10.12693/APhysPolA.132.1443].
Positronium for antihydrogen production in the AEGIS experiment
F. Castelli;M. Giammarchi;Z. Mazzotta;F. Prelz;
2017
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 o ers the advantage to produce su ciently 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 n4, 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.File | Dimensione | Formato | |
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