Effects of perturbation for transition operators of double-β decay on nuclear matrix element
- NázevTitle
- Effects of perturbation for transition operators of double-β decay on nuclear matrix elementEffects of perturbation for transition operators of double-β decay on nuclear matrix element
- Druh výsledkuResult type
- Příspěvek ve sborníkuProceedings paper
- AutořiAuthors
- J. Terasaki, O. Civitarese
- Klíčová slovaKeywords
- neutrinoless double beta decay
- KonferenceConference
- Matrix Elements for the Double-beta-decay EXperiments (Prague, Czechia, 2025-06-23)
- DOIDOI
- 10.22323/1.495.0016
- Časopis / citaceJournal / citation
- In: Proceedings of Matrix Elements for the Double beta decay EXperiments — PoS(MEDEX2025), Sissa Medialab, 2025, pp. 016 · ISSN 1824-8039
- RokYear
- 2025
- JazykLanguage
- eng
- ZáznamyRecords
- ProjektProject
- Zkoumaní vlastností neutrin prostřednictvím dvojitého beta rozpadu: Souhra teorie a experimentuExploring the Properties of Neutrinos through Double Beta Decay: An Interplay between Theory and Experiment
- Plný text (open access)Full text (open access)
- https://pos.sissa.it/495/016/
- Citace ke staženíDownload citation
- TXT · BibTeX
AbstraktAbstract
We show that the effective axial-vector current couplings (geffA) for the neutrinoless double-β (0νββ) and the two-neutrino double-β (2νββ) decays are close to each other in the decay instance of 136Xe→136Ba. This is a remarkable finding because geffA for the 0νββ decay was unknown at all. This is shown by our calculation with the transition operator perturbed by the residual nucleon-nucleon interaction. The nuclear wave functions are supplied by the quasiparticle random-phase approximation with phenomenological interactions. The sum of the correction terms of the nuclear matrix element due to the perturbation is half the leading term in absolute value and negative. The influence of the perturbation on the half-life for the 2νββ decay is also shown to be significantly large. The more perturbation, the longer the half-life.
We show that the effective axial-vector current couplings (geffA) for the neutrinoless double-β (0νββ) and the two-neutrino double-β (2νββ) decays are close to each other in the decay instance of 136Xe→136Ba. This is a remarkable finding because geffA for the 0νββ decay was unknown at all. This is shown by our calculation with the transition operator perturbed by the residual nucleon-nucleon interaction. The nuclear wave functions are supplied by the quasiparticle random-phase approximation with phenomenological interactions. The sum of the correction terms of the nuclear matrix element due to the perturbation is half the leading term in absolute value and negative. The influence of the perturbation on the half-life for the 2νββ decay is also shown to be significantly large. The more perturbation, the longer the half-life.