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...

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Detalles Bibliográficos
Autores: Jokiniemi, Lotta, Romeo, B., Brase, C., Kotila, J., Soriano, Pablo, Schwenk, A., Menéndez Sánchez, Javier
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
Descripción
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.