Assessment of the beta-delayed proton decay rate of ${}^{11}$Be

Abstract

The ${}^{11}$Be neutron halo nucleus appears to decay into ${}^{10}$Be with a rate that exceeds expectations. Neutron disappearance into dark matter, beta decay of a halo neutron, or beta-delayed proton decay have been offered as explanations. In this work we study the latter option; we carry out shell model calculations and sequential decay analysis examining the beta-delayed proton decay going through a resonance in ${}^{11}$B. The narrow energy window, lack of states with sufficient spectroscopic strength, overwhelming alpha decay branch, all make reconciling the observed rate with beta-delayed proton decay difficult.

arXiv comment8 pages, 2 figures

References in corpus (11)

• Dark Matter Interpretation of the Neutron Decay Anomaly
• 11Be(beta-p), a quasi-free neutron decay?
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• Structure of ${}^{38}$Cl and the quest for a comprehensive shell model interaction
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Cited by in corpus (4)

• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• ${\beta }^{-}\mathrm{p}$ and ${\beta }^{-}\alpha$ decay of the ${}^{11}$Be neutron halo ground state
• Single-particle properties of the near-threshold proton-emitting resonance in ${}^{11}$B
• Neutron-neutral particle mixing and its observable consequences