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EnglishA positronium Time of Flight (TOF) apparatus, conceived to work with continuous positron beams of intensity up to ∼106 positrons/s, was developed. The geometry of the TOF chamber and the acquisition chain are described in detail. The performances of the set up were preliminary tested with a laboratory positron beam of ∼5 × 103 positrons/s by measuring the Time of Flight of Ps emitted from oxidized nanochannels produced in a Si single crystal. A TOF spectrum of ∼104 events was collected in 9 days with a time resolution of 8 ns. The analysis of the TOF spectrum is discussed. This apparatus is going to be assembled at the intense positron source NEPOMUC at FRM-II reactor, where the measurement time of each spectrum will be reduced to less than 2 h, making this TOF system appropriate to investigate positronium emission after cooling in porous materials held at cryogenic temperature.
| Titolo: | Time of flight system to investigate Positronium cooling |
| Autori: | Di Noto, Lea; Mariazzi, Sebastiano; Bettonte, Marco; Nebbia, G.; Brusa, Roberto Sennen |
| Autori Unitn: | |
| Titolo del periodico: | THE EUROPEAN PHYSICAL JOURNAL. D, ATOMIC, MOLECULAR AND OPTICAL PHYSICS |
| Anno di pubblicazione: | 2012 |
| Codice identificativo Scopus: | 2-s2.0-84861354190 |
| Codice identificativo ISI: | WOS:000305245400012 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1140/epjd/e2012-20674-7 |
| Handle: | http://hdl.handle.net/11572/92005 |
| Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |
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