Decay mechanism and lifetime of 67Kr
Abstract
The lifetime of the recently discovered 2p emitter 67Kr 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 67Kr, 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 Er=1.35-1.42 MeV on the ground state energy of 66Br relative to the 65Se-p threshold.
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