Laboratory Simulation of the Positron-Dust Interaction and its Implication for Interstellar Dark Clouds

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F23%3A00573218" target="_blank" >RIV/61389021:_____/23:00573218 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/23:00567741 RIV/00216208:11320/23:10469102 RIV/68407700:21460/23:00363276 RIV/68407700:21670/23:00363276

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.3847/1538-4357/aca01c" target="_blank" >https://iopscience.iop.org/article/10.3847/1538-4357/aca01c</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/aca01c" target="_blank" >10.3847/1538-4357/aca01c</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Laboratory Simulation of the Positron-Dust Interaction and its Implication for Interstellar Dark Clouds

Popis výsledku v původním jazyce

We report the first laboratory experiment dealing with the interaction of a cosmic dust simulant with positrons emitted from a 22Na radioisotope. Measurements of a charge of micrometer SiO2 dust grains with an accuracy of one elementary charge e revealed +1 e steps due to positron annihilation inside the grain. The observed average rate of these charging events agrees well with prediction of a model based on the continuous slowing down approximation of energetic of positrons inside the grain. Less frequent charge steps larger than +1 e were attributed to emission of secondary electrons during positron slowing down. The determined coefficient of secondary electron emission is approximately inversely proportional to the grain radius. The experimental results led us to the formulation of a possible scenario of interstellar dark clouds charging.

Název v anglickém jazyce

Laboratory Simulation of the Positron-Dust Interaction and its Implication for Interstellar Dark Clouds

Popis výsledku anglicky

We report the first laboratory experiment dealing with the interaction of a cosmic dust simulant with positrons emitted from a 22Na radioisotope. Measurements of a charge of micrometer SiO2 dust grains with an accuracy of one elementary charge e revealed +1 e steps due to positron annihilation inside the grain. The observed average rate of these charging events agrees well with prediction of a model based on the continuous slowing down approximation of energetic of positrons inside the grain. Less frequent charge steps larger than +1 e were attributed to emission of secondary electrons during positron slowing down. The determined coefficient of secondary electron emission is approximately inversely proportional to the grain radius. The experimental results led us to the formulation of a possible scenario of interstellar dark clouds charging.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

942

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

42

Kód UT WoS článku

000908109100001

EID výsledku v databázi Scopus

2-s2.0-85146166671