Velocity-selected production of 2 S 3 metastable positronium
- Creators
- Amsler C.
- Antonello M.
- Belov A.
- Bonomi G.
- Brusa R. S.
- Caccia M.
- Camper A.
- Caravita R.
- Castelli F.
- Cerchiari G.
- Comparat D.
- Consolati G.
- Demetrio A.
- Di Noto L.
- Doser M.
- Fani M.
- Gerber S.
- Gligorova A.
- Guatieri F.
- Hackstock P.
- Haider S.
- Hinterberger A.
- Holmestad H.
- Kellerbauer A.
- Khalidova O.
- Krasnicky D.
- Lagomarsino V.
- Lansonneur P.
- Lebrun P.
- Malbrunot C.
- Mariazzi S.
- Matveev V.
- Muller S. R.
- Nebbia G.
- Nedelec P.
- Oberthaler M.
- Pagano D.
- Penasa L.
- Petracek V.
- Prelz F.
- Prevedelli M.
- Rienaecker B.
- Robert J.
- Rohne O. M.
- Rotondi A.
- Sandaker H.
- Santoro R.
- Smestad L.
- Sorrentino F.
- Testera G.
- Tietje I. C.
- Widmann E.
- Yzombard P.
- Zimmer C.
- Zurlo N.
- Others:
- Amsler, C.
- Antonello, M.
- Belov, A.
- Bonomi, G.
- Brusa, R. S.
- Caccia, M.
- Camper, A.
- Caravita, R.
- Castelli, F.
- Cerchiari, G.
- Comparat, D.
- Consolati, G.
- Demetrio, A.
- Di Noto, L.
- Doser, M.
- Fani, M.
- Gerber, S.
- Gligorova, A.
- Guatieri, F.
- Hackstock, P.
- Haider, S.
- Hinterberger, A.
- Holmestad, H.
- Kellerbauer, A.
- Khalidova, O.
- Krasnicky, D.
- Lagomarsino, V.
- Lansonneur, P.
- Lebrun, P.
- Malbrunot, C.
- Mariazzi, S.
- Matveev, V.
- Muller, S. R.
- Nebbia, G.
- Nedelec, P.
- Oberthaler, M.
- Pagano, D.
- Penasa, L.
- Petracek, V.
- Prelz, F.
- Prevedelli, M.
- Rienaecker, B.
- Robert, J.
- Rohne, O. M.
- Rotondi, A.
- Sandaker, H.
- Santoro, R.
- Smestad, L.
- Sorrentino, F.
- Testera, G.
- Tietje, I. C.
- Widmann, E.
- Yzombard, P.
- Zimmer, C.
- Zurlo, N.
Description
Positronium in the 2S3 metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns), making it a promising candidate for interferometry experiments with a neutral matter-antimatter system. In the present work, 2S3 positronium is produced, in the absence of an electric field, via spontaneous radiative decay from the 3P3 level populated with a 205-nm UV laser pulse. Thanks to the short temporal length of the pulse, 1.5 ns full width at half maximum, different velocity populations of a positronium cloud emitted from a nanochanneled positron-positronium converter were selected by delaying the excitation pulse with respect to the production instant. 2S3 positronium atoms with velocity tuned between 7×104ms-1 and 10×104ms-1 were thus produced. Depending on the selected velocity, a 2S3 production efficiency ranging from ∼0.8% to ∼1.7%, with respect to the total amount of emitted positronium, was obtained. The observed results give a branching ratio for the 3P3-2S3 spontaneous decay of (9.7±2.7)%. The present velocity selection technique could allow one to produce an almost monochromatic beam of ∼1×1032S3 atoms with a velocity spread of <104ms-1 and an angular divergence of ∼50 mrad.
Additional details
- URL
- http://hdl.handle.net/11567/960110
- URN
- urn:oai:iris.unige.it:11567/960110
- Origin repository
- UNIGE