Decay mechanism and lifetime of ${}^{67}$Kr

Abstract

The lifetime of the recently discovered $2p$ emitter ${}^{67}$Kr was recently found considerably below the lower limit predicted theoretically. This communication addresses this issue.Different separation energy systematics are analyzed and different mechanisms for $2p$ emission are evaluated. It is found that the most plausible reason for this disagreement is a decay mechanism of ${}^{67}$Kr, which is not "true $2p$" emission, but "transition dynamics" on the borderline between true $2p$ and sequential $2p$ decay mechanisms. If this is true, this imposes stringent limits $E_r=1.35-1.42$ MeV on the ground state energy of ${}^{66}$Br relative to the ${}^{65}$Se-$p$ threshold.

arXiv comment7 pages, 8 figures

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Cited by in corpus (10)

• Recent developments in radioactive charged-particle emissions and related phenomena
• Recent Progress in Two-proton Radioactivity
• Beyond the proton drip line: Bayesian analysis of proton-emitting nuclei
• The puzzling two-proton decay of ${}^{67}$Kr
• Two-proton emission and related phenomena
• Fermion Pair Dynamics in Open Quantum Systems
• Deep excursion beyond the proton dripline. I. Argon and chlorine isotope chains
• Extended R-matrix description of two-proton radioactivity
• Exploring the possible two-proton radioactivity of ${}^{38,39}$Ti
• Three-body vs. dineutron approach to two-neutron radiative capture in ${}^6$He