^{138}Ba(d,) Study of States in ^{136}Cs: Implications for New Physics Searches with Xenon Detectors. Academic Article uri icon


  • We used the ^{138}Ba(d,) reaction to carry out an in-depth study of states in ^{136}Cs, up to around 2.5MeV. 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 ^{136}Cs, 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 ^{136}Xe 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 ^{136}Cs spectrum, while the other two show reasonably good agreement.

published proceedings

  • Phys Rev Lett

altmetric score

  • 0.5

author list (cited authors)

  • Rebeiro, B. M., Triambak, S., Garrett, P. E., Ball, G. C., Brown, B. A., Menndez, J., ... Wirth, H.

citation count

  • 4

complete list of authors

  • Rebeiro, BM||Triambak, S||Garrett, PE||Ball, GC||Brown, BA||Menéndez, J||Romeo, B||Adsley, P||Lenardo, BG||Lindsay, R||Bildstein, V||Burbadge, C||Coleman, R||Diaz Varela, A||Dubey, R||Faestermann, T||Hertenberger, R||Kamil, M||Leach, KG||Natzke, C||Nzobadila Ondze, JC||Radich, A||Rand, E||Wirth, H-F

publication date

  • August 2023