A Systematic Study of Two-Neutrino Double Electron Capture

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F24%3A00381083" target="_blank" >RIV/68407700:21670/24:00381083 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3390/universe10020098" target="_blank" >https://doi.org/10.3390/universe10020098</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/universe10020098" target="_blank" >10.3390/universe10020098</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A Systematic Study of Two-Neutrino Double Electron Capture

Popis výsledku v původním jazyce

In this paper, we update the phase-space factors for all two-neutrino double electron capture processes. The Dirac-Hartree-Fock-Slater self-consistent method is employed to describe the bound states of captured electrons, enabling a more realistic treatment of atomic screening and more precise binding energies of the captured electrons compared to previous investigations. Additionally, we consider all s-wave electrons available for capture, expanding beyond the K and L1 orbitals considered in prior studies. For light atoms, the increase associated with additional captures compensates for the decrease in decay rate caused by the more precise atomic screening. However, for medium and heavy atoms, an increase in the decay rate, up to 10% for the heaviest atoms, is observed due to the combination of these two effects. In the systematic analysis, we also include capture fractions for the first few dominant partial captures. Our precise model enables a close examination of low Q-value double electron capture in 152Gd, 164Er, and 242Cm, where partial KK captures are energetically forbidden. Finally, with the updated phase-space values, we recalculate the effective nuclear matrix elements and compare their spread with those associated with 2 nu beta-beta- decay.

Název v anglickém jazyce

A Systematic Study of Two-Neutrino Double Electron Capture

Popis výsledku anglicky

In this paper, we update the phase-space factors for all two-neutrino double electron capture processes. The Dirac-Hartree-Fock-Slater self-consistent method is employed to describe the bound states of captured electrons, enabling a more realistic treatment of atomic screening and more precise binding energies of the captured electrons compared to previous investigations. Additionally, we consider all s-wave electrons available for capture, expanding beyond the K and L1 orbitals considered in prior studies. For light atoms, the increase associated with additional captures compensates for the decrease in decay rate caused by the more precise atomic screening. However, for medium and heavy atoms, an increase in the decay rate, up to 10% for the heaviest atoms, is observed due to the combination of these two effects. In the systematic analysis, we also include capture fractions for the first few dominant partial captures. Our precise model enables a close examination of low Q-value double electron capture in 152Gd, 164Er, and 242Cm, where partial KK captures are energetically forbidden. Finally, with the updated phase-space values, we recalculate the effective nuclear matrix elements and compare their spread with those associated with 2 nu beta-beta- decay.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/GA24-10180S" target="_blank" >GA24-10180S: Zkoumaní vlastností neutrin prostřednictvím dvojitého beta rozpadu: Souhra teorie a experimentu</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Universe

ISSN

2218-1997

e-ISSN

2218-1997

Svazek periodika

10

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

—

Kód UT WoS článku

001172471900001

EID výsledku v databázi Scopus

2-s2.0-85186339579