“Super GZK” particles in a classic Kramers' diffusion-over-a-barrier model. I. The case of protons

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00546330" target="_blank" >RIV/68378271:_____/21:00546330 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/1538-4357/abffda" target="_blank" >https://doi.org/10.3847/1538-4357/abffda</a>

DOI - Digital Object Identifier

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

Jazyk výsledku

angličtina

Název v původním jazyce

“Super GZK” particles in a classic Kramers' diffusion-over-a-barrier model. I. The case of protons

Popis výsledku v původním jazyce

In interactions of ultra-high-energy cosmic ray (UHECR) protons with cosmic microwave background photons, we focus in this work on photopion production reactions and the effects of the measured, broad, energy-loss distributions in these reactions on the evolution of the protons' density functions in energy space. We rely on a Fokker-Planck transport equation in energy space whose transport coefficients are calculated using laboratory measurements. We also derive a Fokker-Planck potential that accounts for both systematic (drift) and stochastic (dispersive) energy losses due to photopion production reactions. Our results show that dispersive energy losses have significant effects on estimating the protons' horizon distance and their energy spectrum, as well as to elucidate a broadness in the GZK cutoff. We use the derived Fokker-Planck potential to assign a characteristic probability for a proton to clear the potential barrier as a function of energy.

Název v anglickém jazyce

“Super GZK” particles in a classic Kramers' diffusion-over-a-barrier model. I. The case of protons

Popis výsledku anglicky

In interactions of ultra-high-energy cosmic ray (UHECR) protons with cosmic microwave background photons, we focus in this work on photopion production reactions and the effects of the measured, broad, energy-loss distributions in these reactions on the evolution of the protons' density functions in energy space. We rely on a Fokker-Planck transport equation in energy space whose transport coefficients are calculated using laboratory measurements. We also derive a Fokker-Planck potential that accounts for both systematic (drift) and stochastic (dispersive) energy losses due to photopion production reactions. Our results show that dispersive energy losses have significant effects on estimating the protons' horizon distance and their energy spectrum, as well as to elucidate a broadness in the GZK cutoff. We use the derived Fokker-Planck potential to assign a characteristic probability for a proton to clear the potential barrier as a function of energy.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

—

Rok uplatnění

2021

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

915

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

11

Kód UT WoS článku

000667941100001

EID výsledku v databázi Scopus

2-s2.0-85109831664