Abstract
We report on an attempt to reproduce the observation of \(\beta ^-\)-delayed proton emission from \(^{11}\)Be through detection of the final state nucleus \(^{10}\)Be with accelerator mass spectrometry. Twelve samples were collected at the ISOLDE facility at CERN at different separator settings, allowing tests of different sources of contamination to be carried out. The observed amounts of \(^{10}\)Be per collected \(^{11}\)Be rule out several contamination sources, but do not agree internally. Formation of BeH molecular ions in the ion source may explain our data, in which case an upper limit of the \(\beta \)p branching ratio of \(2.2 \times 10^{-6}\) can be derived.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The main data are given in the text. Raw data are available upon reasonable request.]
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Acknowledgements
We would like to thank the ISOLDE technical teams for their efforts and T. Andersen, J. Heinemeier, B. Marsh, H. Ravn, S. Rothe, P. Van Duppen and K. Wendt for discussions. We would like to acknowledge support from the European Union’s Horizon 2020 research and innovation programme under Grant agreement no. 654002, from the Spanish research projects FPA2015-64969-P, FPA2015-65035-P and FPA2017-87568-P (MINECO/FEDER, UE), and from the Danish Council for Independent Research (DFF-4181-00218).
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Communicated by Klaus Blaum
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Riisager, K., Borge, M.J.G., Briz, J.A. et al. Search for beta-delayed proton emission from \(^{11}\)Be. Eur. Phys. J. A 56, 100 (2020). https://doi.org/10.1140/epja/s10050-020-00110-2
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DOI: https://doi.org/10.1140/epja/s10050-020-00110-2