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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F21%3A00351573" target="_blank" >RIV/68407700:21340/21:00351573 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1088/1361-6455/abf6b6" target="_blank" >https://doi.org/10.1088/1361-6455/abf6b6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6455/abf6b6" target="_blank" >10.1088/1361-6455/abf6b6</a>

Result language

angličtina

Original language name

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

Original language description

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 1(3)S -> 2(3)P transition. 2 gamma-3 gamma 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 mu m, similar to 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 mu m, 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

<a href="/en/project/LM2015058" target="_blank" >LM2015058: Research Infrastructure for Experiments at CERN</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physics B: Atomic, Molecular and Optical Physics

ISSN

0953-4075

e-ISSN

1361-6455

Volume of the periodical

54

Issue of the periodical within the volume

8

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

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UT code for WoS article

000648710700001

EID of the result in the Scopus database

2-s2.0-85106280191