| Published Articles | |
| Title | High-yield thermalized positronium at room temperature emitted by morphologically tuned nanochanneled silicon targets |
| Author(s) |
Mariazzi, S (Trento U. ; TIFPA-INFN, Trento) ; Caravita, R (TIFPA-INFN, Trento) ; Zimmer, C (CERN ; Heidelberg U. ; Oslo U.) ; Rienäcker, B (CERN) ; Camper, A (Oslo U.) ; Belov, A (Moscow, INR) ; Bonomi, G (Brescia U. ; INFN, Brescia) ; Brusa, R S (Trento U. ; TIFPA-INFN, Trento) ; Castelli, F (INFN, Milan ; Milan U.) ; Consolati, G (INFN, Milan ; Milan Polytechnic) ; Doser, M (CERN) ; Gjersdal, H (Oslo U.) ; Glöggler, L T (CERN) ; Guatieri, F (Trento U. ; Forschungsreaktor Munich) ; Haider, S (CERN) ; Matveev, V (Moscow, INR ; Dubna, JINR) ; Nebbia, G (INFN, Padua) ; Nedelec, P (Lyon, IPN) ; Pagano, D (Brescia U. ; INFN, Brescia) ; Penasa, L (Trento U. ; TIFPA-INFN, Trento) ; Petracek, V (CTU, Prague) ; Prelz, F (INFN, Milan) ; Povolo, L (Trento U. ; TIFPA-INFN, Trento) ; Rhøne, O M (Oslo U.) ; Rotondi, A (INFN, Brescia ; Pavia U.) ; Sandaker, H (Oslo U.) ; Zurlo, N (INFN, Brescia ; Brescia U. ; Stanford U., Civil Eng. Dept.) |
| Publication | 2021 |
| Number of pages | 11 |
| In: | J. Phys. B 54 (2021) 085004 |
| DOI | 10.1088/1361-6455/abf6b6 |
| Subject category | Physics in General |
| Accelerator/Facility, Experiment | CERN AEgIS |
| Abstract | 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. |
| Copyright/License | © 2021-2024 The Author(s) (License: CC-BY-4.0) |
Corresponding record in: Inspire
Zapis kreiran 2021-05-27, zadnja izmjena 2021-05-27