The 33P state of positronium is an intermediate level suitable for producing long-lived positronium states. On one hand, it can be used in a two-step laser excitation scheme from the ground state to Rydberg levels. On the other hand, excitation of positronium to 33P level is a simple pathway for producing metastable 23S positronium atoms by spontaneous radiactive decay. In this work, experiments showing the production of such long-lived levels, using the 33P state as intermediate state, are presented. The characteristics of the two long-lived levels, in view of experiments of deflectometry/interferometry with positronium, are discussed.
Production of long-lived positronium states via laser excitation to 33P level / S. Mariazzi, R. Caravita, S. Aghion, C. Amsler, M. Antonello, A. Belov, G. Bonomi, R.S. Brusa, M. Caccia, A. Camper, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, C. Evans, M. Fani, R. Ferragut, J. Fesel, A. Fontana, S. Gerber, M. Giammarchi, A. Gligorova, F. Guatieri, P. Hackstock, S. Haider, A. Hinterberger, H. Holmestad, A. Kellerbauer, O. Khalidova, D. Krasnicky, V. Lagomarsino, P. Lansonneur, P. Lebrun, C. Malbrunot, V. Matveev, S.R. Mueller, G. Nebbia, P. Nedelec, M. Oberthaler, D. Pagano, L. Penasa, V. Petracek, F. Prelz, M. Prevedelli, B. Rienaecker, J. Robert, O.M. Roehne, A. Rotondi, H. Sandaker, R. Santoro, L. Smestad, F. Sorrentino, G. Testera, I.C. Tietje, E. Widmann, P. Yzombard, C. Zimmer, N. Zurlo (AIP CONFERENCE PROCEEDINGS). - In: Positron Annihilation Spectroscopy-Fundamentals, Techniques ad Applications / [a cura di] F. Selim. - [s.l] : AIP, 2019 Dec. - ISBN 9780735419292. - pp. 030004-1-030004-6 (( Intervento presentato al 18. convegno International Conference on Positron Annihilation: Positron Annihilation Spectroscopy-Fundamentals tenutosi a Orlando nel 2018.
Production of long-lived positronium states via laser excitation to 33P level
F. Castelli;M. Giammarchi;F. Prelz;
2019
Abstract
The 33P state of positronium is an intermediate level suitable for producing long-lived positronium states. On one hand, it can be used in a two-step laser excitation scheme from the ground state to Rydberg levels. On the other hand, excitation of positronium to 33P level is a simple pathway for producing metastable 23S positronium atoms by spontaneous radiactive decay. In this work, experiments showing the production of such long-lived levels, using the 33P state as intermediate state, are presented. The characteristics of the two long-lived levels, in view of experiments of deflectometry/interferometry with positronium, are discussed.
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