Double Beta Decay of 48Ca within EMPM and STDA methods
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F25%3A00387252" target="_blank" >RIV/68407700:21670/25:00387252 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1051/epjconf/202534201030" target="_blank" >https://doi.org/10.1051/epjconf/202534201030</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/epjconf/202534201030" target="_blank" >10.1051/epjconf/202534201030</a>
Alternative languages
Result language
angličtina
Original language name
Double Beta Decay of 48Ca within EMPM and STDA methods
Original language description
The calculation of nuclear matrix elements (NMEs) for neutrinoless double-beta decay (0νββ) remains a major theoretical challenge in nuclear physics, as NMEs for this process cannot be accessed directly through experiment. Current nuclear structure models yield significantly different predictions for 0νββ NMEs, making it essential to validate theoretical approaches using observables that are experimentally known. In contrast, two-neutrino double-beta decay (2νββ) has been measured in eleven isotopes, providing a valuable benchmark for testing the reliability of nuclear many-body methods. In this work, we compute the 2νββ decay half-life of 48Ca using the Second Tamm-Dancoff Approximation (STDA) and the Equation of Motion Phonon Method (EMPM). By extending EMPM up to two-phonon configurations, we confirm that the two approaches yield practically identical numerical results, providing a strong internal consistency check. In addition, we study the dependence of the 2νββ NME on the Gamow-Teller and Fermi contributions, on the particle-hole interaction strength parameter gph. Accurately reproducing the experimental 2νββ half-life requires a substantial quenching of the axial-vector coupling constant gA. Furthermore, our theoretical framework outlines a strategy to mitigate this quenching issue by systematically including more complex configurations in the nuclear wave function.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
<a href="/en/project/GA24-10180S" target="_blank" >GA24-10180S: Exploring the Properties of Neutrinos through Double Beta Decay: An Interplay between Theory and Experiment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
14th International Spring Seminar on Nuclear Physics “Cutting-Edge Developments in Nuclear Structure Physics”
ISBN
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ISSN
2101-6275
e-ISSN
2100-014X
Number of pages
8
Pages from-to
1-8
Publisher name
EPJ Web of Conferences
Place of publication
Les Ulis Cedex A
Event location
Ischia
Event date
May 19, 2025
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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