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2023-07-31

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/216202

138Ba(d,alpha) Study of States in 136Cs: Implications for New Physics Searches with Xenon Detectors

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https://doi.org/10.1103/PhysRevLett.131.052501

Resum

We used the 138Ba⁢( , ) reaction to carry out an in-depth study of states in 136Cs, up to around 2.5 MeV. In this Letter, we place emphasis on hitherto unobserved states below the first 1+ level, which are important in the context of solar neutrino and fermionic dark matter (FDM) detection in large-scale xenon-based experiments. We identify for the first time candidate metastable states in 136Cs, which would allow a real-time detection of solar neutrino and FDM events in xenon detectors, with high background suppression. Our results are also compared with shell-model calculations performed with three Hamiltonians that were previously used to evaluate the nuclear matrix element (NME) for 136Xe neutrinoless double beta decay. We find that one of these Hamiltonians, which also systematically underestimates the NME compared with the others, dramatically fails to describe the observed low-energy 136Cs spectrum, while the other two show reasonably good agreement.

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Reaccions nuclears, Matèria fosca (Astronomia), Neutrins solars

Matèries (anglès)

Nuclear reactions, Dark matter (Astronomy), Solar neutrinos

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citació

REBEIRO, B. m., TRIAMBAK, S., GARRETT, P. e., BALL, G. c., BROWN, B. a., MENÉNDEZ SÁNCHEZ, Javier, ROMEO, B., ADSLEY, P., LENARDO, B. g., LINDSAY, R., BILDSTEIN, V., BURBADGE, C., COLEMAN, R., DIAZ VARELA, A., DUBEY, R., FAESTERMANN, T., HERTENBERGER, R., KAMIL, M., LEACH, K. g., NATZKE, C., NZOBADILA ONDZE, J. c., RADICH, A., RAND, E., WIRTH, H. -f.. 138Ba(d,alpha) Study of States in 136Cs: Implications for New Physics Searches with Xenon Detectors. _Physical Review Letters_. 2023. Vol. 131, núm. 052501. [consulta: 5 de febrer de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/216202]

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