Two-neutrino ββ decay of 136Xe to the first excited 0+ state in 136Ba
We calculate the nuclear matrix element for the two-neutrino ββ decay of 136Xe into the first excited state of 136Ba. We use different many-body methods: the quasiparticle random-phase approximation (QRPA) framework, the nuclear shell model, the interacting boson model (IBM-2), and an effective fiel...
| Autores: | , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/215265 |
| Acceso en línea: | https://hdl.handle.net/2445/215265 |
| Access Level: | acceso abierto |
| Palabra clave: | Neutrins Física nuclear Física de partícules Neutrinos Nuclear physics Particle physics |
| Sumario: | We calculate the nuclear matrix element for the two-neutrino ββ decay of 136Xe into the first excited state of 136Ba. We use different many-body methods: the quasiparticle random-phase approximation (QRPA) framework, the nuclear shell model, the interacting boson model (IBM-2), and an effective field theory (EFT) for β and ββ decays. While the QRPA suggests a decay rate at the edge of current experimental limits, the shell model points to a half-life about two orders of magnitude longer. The predictions of the IBM-2 and the EFT lie in between, and the latter provides systematic uncertainties at leading order. An analysis of the running sum of the nuclear matrix element indicates that subtle cancellations between the contributions of intermediate states can explain the different theoretical predictions. For the EFT, we also present results for two-neutrino ββ decays to the first excited state in other nuclei. |
|---|