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: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
7 May 2021
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| 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 |
MARC
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| 245 | 1 | 0 | |a High-yield thermalized positronium at room temperature emitted by morphologically tuned nanochanneled silicon targets |c 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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| 520 | |a 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. | ||
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| 700 | 1 | |a Rienäcker, B. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Camper, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Belov, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Bonomi, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Brusa, R. S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Castelli, F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Consolati, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Doser, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Gjersdal, H. |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Nebbia, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Nedelec, P. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Pagano, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Penasa, L. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Petracek, V. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Prelz, F. |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Rhøne, O. M. |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Sandaker, H. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Zurlo, N. |e VerfasserIn |4 aut | |
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