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High-yield thermalized positronium at room temperature emitted by morphologically tuned nanochanneled silicon targets

Nanochanneled silicon targets with high positron/positronium (Ps) conversion rate and efficient Ps cooling were produced. Morphological parameters of the nanochannels, such as their diameter and length, were adjusted to get a large fraction of thermalized Ps at room temperature being emitted into va...

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Main Authors: Mariazzi, Sebastiano (Author) , Caravita, R. (Author) , Zimmer, Christian (Author) , Rienäcker, B. (Author) , Camper, A. (Author) , Belov, A. (Author) , Bonomi, G. (Author) , Brusa, R. S. (Author) , Castelli, F. (Author) , Consolati, G. (Author) , Doser, M. (Author) , Gjersdal, H. (Author) , Glöggler, L. T. (Author) , Guatieri, F. (Author) , Haider, S. (Author) , Matveev, V. (Author) , Nebbia, G. (Author) , Nedelec, P. (Author) , Pagano, D. (Author) , Penasa, L. (Author) , Petracek, V. (Author) , Prelz, F. (Author) , Povolo, L. (Author) , Rhøne, O. M. (Author) , Rotondi, A. (Author) , Sandaker, H. (Author) , Zurlo, N. (Author)
Format: Article (Journal)
Language:English
Published: 7 May 2021
In: Journal of physics. B, Atomic, molecular and optical physics
Year: 2021, Volume: 54, Issue: 8, Pages: 1-12
ISSN:1361-6455
DOI:10.1088/1361-6455/abf6b6
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/1361-6455/abf6b6
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Author Notes:S. Mariazzi, R. Caravita, C. Zimmer, B. Rienäcker, A. Camper, A. Belov, G. Bonomi, R.S. Brusa, F. Castelli, G. Consolati, M. Doser, H. Gjersdal, L.T. Glöggler, F. Guatieri, S. Haider, V. Matveev, G. Nebbia, P. Nedelec, D. Pagano, L. Penasa, V. Petracek, F. Prelz, L. Povolo, O. M. Rhøne, A. Rotondi, H. Sandaker, N. Zurlo and AEgIS Collaboration
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Summary:Nanochanneled silicon targets with high positron/positronium (Ps) conversion rate and efficient Ps cooling were produced. Morphological parameters of the nanochannels, such as their diameter and length, were adjusted to get a large fraction of thermalized Ps at room temperature being emitted into vacuum. Ps cooling measurements were conducted combining single-shot positron annihilation lifetime spectroscopy and Doppler spectroscopy of the 13S → 23P transition. 2γ-3γ annihilation ratio measurements were also performed to estimate the positron/Ps conversion efficiency. In a converter with nanochannel diameter of 7-10 nm and depth of 3.89 μm, ∼28% of implanted positrons with an energy of 3.3 keV was found to be emitted as Ps with a transverse kinetic energy of 11 ± 2 meV. The reduction of the nanochannels depth to 1.13 μm, without changing the nanochannel diameter, was found to result in a less efficient cooling, highlighting the presence of Ps reflection from the bottom end of nanochannels.
Item Description:Gesehen am 13.08.2021
Physical Description:Online Resource
ISSN:1361-6455
DOI:10.1088/1361-6455/abf6b6

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