$\beta$-decay studies of neutron-rich K isotopes

Abstract : The beta decay of the neutron-rich nuclei $^{51-53}$K has been used to populate bound and unbound states in $^{50-53}$Ca. Measurements of gamma rays as well as beta-delayed neutrons enabled detailed decay schemes to be established and levels identified in $^{50-53}$Ca. A delayed one-neutron emission probability P$_{1n}$ of 63±8% was determined for the decay of $^{51}$K. A total of seven new gamma transitions were observed following the decay of $^{51}$K, and 25 neutron branches were found that enrich the level scheme of $^{51}$Ca. Delayed neutron emission probabilities of P$_{1n}$=74.4±9.3% and P$_{2n}$=2.3±0.3% were determined for the decay of $^{52}$K, and 12 new gamma transitions were observed in $^{50,51,52}$Ca. Three new gamma transitions were observed in $^{52,53}$Ca following the beta decay of $^{53}$K. New limits on the P$_{1n}$ and P$_{2n} values were determined for the beta decay of $^{53}$K, and a decay scheme was established for $^{53}$Ca 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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Submitted on : Thursday, August 24, 2006 - 11:12:06 AM
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F. Perrot, F. Maréchal, C. Jollet, P. Dessagne, J.C. Angélique, et al.. $\beta$-decay studies of neutron-rich K isotopes. Physical Review C, American Physical Society, 2006, 74, pp.014313. ⟨10.1103/PhysRevC.74.014313⟩. ⟨in2p3-00089852⟩



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