The {β} decay of the neutron-rich nuclei ^51-53K has been used to populate bound and unbound states in ^50-53Ca. Measurements of {γ} rays as well as {β}-delayed neutrons enabled detailed decay schemes to be established and levels identified in ^50-53Ca. A delayed one-neutron emission probability P₁ₙ of 63±8% was determined for the decay of ⁵¹K. A total of seven new {γ} 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 P₁ₙ=74.4±9.3% and P₂ₙ=2.3±0.3% were determined for the decay of ⁵²K, and 12 new {γ} transitions were observed in 50,51,52Ca. Three new {γ} transitions were observed in 52,53Ca following the {β} decay of ⁵³K. New limits on the P₁ₙ and P₂ₙ values were determined for the {β} 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.
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Perrot et al. (2006) studied this question.