Estimation of nuclear matrix elements of double-β decay from shell model and quasiparticle random-phase approximation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F21%3A00354839" target="_blank" >RIV/68407700:21670/21:00354839 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1140/epjp/s13360-021-01886-y" target="_blank" >https://doi.org/10.1140/epjp/s13360-021-01886-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjp/s13360-021-01886-y" target="_blank" >10.1140/epjp/s13360-021-01886-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Estimation of nuclear matrix elements of double-β decay from shell model and quasiparticle random-phase approximation

Popis výsledku v původním jazyce

The nuclear matrix element (NME) of neutrinoless double-β (0νββ) decay is an essential input for determining the neutrino effective mass, if the half-life of this decay is measured. Reliable calculation of this NME has been a long-standing problem because of the diversity of the predicted values of the NME, which depends on the calculation method. In this study, we focus on the shell model and the QRPA. The shell model has a rich amount of the many-particle many-hole correlations, and the quasiparticle random-phase approximation (QRPA) can obtain the convergence of the calculation results with respect to the extension of the single-particle space. It is difficult for the shell model to obtain the convergence of the 0νββ NME with respect to the valence single-particle space. The many-body correlations of the QRPA may be insufficient, depending on the nuclei. We propose a new method to phenomenologically modify the results of the shell model and the QRPA compensating for the insufficiencies of each method using the information of other methods in a complementary manner. Extrapolations of the components of the 0νββ NME of the shell model are made toward a very large valence single-particle space. We introduce a modification factor to the components of the 0νββ NME of the QRPA. Our modification method yields similar values of the 0νββ NME for the two methods with respect to 48Ca. The NME of the two-neutrino double-β decay is also modified in a similar but simpler manner, and the consistency of the two methods is improved.

Název v anglickém jazyce

Estimation of nuclear matrix elements of double-β decay from shell model and quasiparticle random-phase approximation

Popis výsledku anglicky

The nuclear matrix element (NME) of neutrinoless double-β (0νββ) decay is an essential input for determining the neutrino effective mass, if the half-life of this decay is measured. Reliable calculation of this NME has been a long-standing problem because of the diversity of the predicted values of the NME, which depends on the calculation method. In this study, we focus on the shell model and the QRPA. The shell model has a rich amount of the many-particle many-hole correlations, and the quasiparticle random-phase approximation (QRPA) can obtain the convergence of the calculation results with respect to the extension of the single-particle space. It is difficult for the shell model to obtain the convergence of the 0νββ NME with respect to the valence single-particle space. The many-body correlations of the QRPA may be insufficient, depending on the nuclei. We propose a new method to phenomenologically modify the results of the shell model and the QRPA compensating for the insufficiencies of each method using the information of other methods in a complementary manner. Extrapolations of the components of the 0νββ NME of the shell model are made toward a very large valence single-particle space. We introduce a modification factor to the components of the 0νββ NME of the QRPA. Our modification method yields similar values of the 0νββ NME for the two methods with respect to 48Ca. The NME of the two-neutrino double-β decay is also modified in a similar but simpler manner, and the consistency of the two methods is improved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/EF16_019%2F0000766" target="_blank" >EF16_019/0000766: Inženýrské aplikace fyziky mikrosvěta</a><br>

Návaznosti

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

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

EUROPEAN PHYSICAL JOURNAL PLUS

ISSN

2190-5444

e-ISSN

—

Svazek periodika

2021 (136)

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

19

Strana od-do

1-19

Kód UT WoS článku

000694249700005

EID výsledku v databázi Scopus

2-s2.0-85114326264