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Forward emission of positronium from nanochanneled silicon membranes

Positronium beam formation and manipulation are required in several fundamental experiments. Efficient positron/positronium conversion in transmission configuration would offer important geometrical advantages over the reflection one for these applications. A novel type of transmission positron/posi...

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Detalles Bibliográficos
Autores principales: Mariazzi, S, Rienäcker, B, Magrin Maffei, R, Povolo, L, Sharma, S, Caravita, R, Penasa, L, Bettotti, P, Doser, M, Brusa, R S
Lenguaje:eng
Publicado: 2022
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevB.105.115422
http://cds.cern.ch/record/2806087
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author Mariazzi, S
Rienäcker, B
Magrin Maffei, R
Povolo, L
Sharma, S
Caravita, R
Penasa, L
Bettotti, P
Doser, M
Brusa, R S
author_facet Mariazzi, S
Rienäcker, B
Magrin Maffei, R
Povolo, L
Sharma, S
Caravita, R
Penasa, L
Bettotti, P
Doser, M
Brusa, R S
author_sort Mariazzi, S
collection CERN
description Positronium beam formation and manipulation are required in several fundamental experiments. Efficient positron/positronium conversion in transmission configuration would offer important geometrical advantages over the reflection one for these applications. A novel type of transmission positron/positronium converters, which consists of silicon membranes with pass-through nanochannels, was produced and tested. The amount of forward emitted positronium was studied as a function of the thickness of the membranes and the nanochannel size. A maximum of, at least, (16 ± 4)% of positrons implanted in (3.5 ± 0.5)-μm-thick membrane with a nanochannel size of 5–8 nm were found to be forward emitted as positronium. A similar maximum amount of, at least, (16 ± 5)%, was found to be emitted from a membrane (7.7 ± 1.3)-μm-thick with a nanochannel size of 7–10 nm. A preliminary evaluation shows that the maximum amount of forward emitted positronium with the entire kinetic energy distribution below 1 eV is, at least, 9% of the positrons implanted in the (3.5 ± 0.5)-μm-thick membrane.
id cern-2806087
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2022
record_format invenio
spelling cern-28060872023-03-22T15:42:02Zdoi:10.1103/PhysRevB.105.115422http://cds.cern.ch/record/2806087engMariazzi, SRienäcker, BMagrin Maffei, RPovolo, LSharma, SCaravita, RPenasa, LBettotti, PDoser, MBrusa, R SForward emission of positronium from nanochanneled silicon membranesCondensed MatterPositronium beam formation and manipulation are required in several fundamental experiments. Efficient positron/positronium conversion in transmission configuration would offer important geometrical advantages over the reflection one for these applications. A novel type of transmission positron/positronium converters, which consists of silicon membranes with pass-through nanochannels, was produced and tested. The amount of forward emitted positronium was studied as a function of the thickness of the membranes and the nanochannel size. A maximum of, at least, (16 ± 4)% of positrons implanted in (3.5 ± 0.5)-μm-thick membrane with a nanochannel size of 5–8 nm were found to be forward emitted as positronium. A similar maximum amount of, at least, (16 ± 5)%, was found to be emitted from a membrane (7.7 ± 1.3)-μm-thick with a nanochannel size of 7–10 nm. A preliminary evaluation shows that the maximum amount of forward emitted positronium with the entire kinetic energy distribution below 1 eV is, at least, 9% of the positrons implanted in the (3.5 ± 0.5)-μm-thick membrane.oai:cds.cern.ch:28060872022
spellingShingle Condensed Matter
Mariazzi, S
Rienäcker, B
Magrin Maffei, R
Povolo, L
Sharma, S
Caravita, R
Penasa, L
Bettotti, P
Doser, M
Brusa, R S
Forward emission of positronium from nanochanneled silicon membranes
title Forward emission of positronium from nanochanneled silicon membranes
title_full Forward emission of positronium from nanochanneled silicon membranes
title_fullStr Forward emission of positronium from nanochanneled silicon membranes
title_full_unstemmed Forward emission of positronium from nanochanneled silicon membranes
title_short Forward emission of positronium from nanochanneled silicon membranes
title_sort forward emission of positronium from nanochanneled silicon membranes
topic Condensed Matter
url https://dx.doi.org/10.1103/PhysRevB.105.115422
http://cds.cern.ch/record/2806087
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