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The decay of the neutron-rich nuclei ^51-53K has been used to populate bound and unbound states in ^50-53Ca. Measurements of rays as well as -delayed neutrons enabled detailed decay schemes to be established and levels identified in ^50-53Ca. A delayed one-neutron emission probability P₁₍ of 638% was determined for the decay of ^51K. A total of seven new transitions were observed following the decay of ^51K, and 25 neutron branches were found that enrich the level scheme of ^51Ca. Delayed neutron emission probabilities of P₁₍=74. 49. 3% and P₂₍=2. 30. 3% were determined for the decay of ^52K, and 12 new transitions were observed in ^50, 51, 52Ca. Three new transitions were observed in ^52, 53Ca following the decay of ^53K. New limits on the P₁₍ and P₂₍ values were determined for the decay of ^53K, and a decay scheme was established for ^53Ca for the first time. The data obtained here should help clarify the structure of neutron-rich fp-shell nuclei around the N=32-34 subshell closures.
Perrot et al. (Fri,) studied this question.