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Physical Review C 74 (2006) 014313
$\beta$-decay studies of neutron-rich K isotopes
F. Perrot1, F. Maréchal1, C. Jollet1, P. Dessagne1, J.C. Angélique2, G. Ban2, P. Baumann1, F. Benrachi, U. Bergmann, C. Borcea, A. Buta, J. Cederkall, S. Courtin1, J.-M. Daugas3, L. M. Fraile, S. Grévy2, A. Jokinen, F.R. Lecolley2, E. Liénard2, G. Le Scornet, V. Méot3, C. Miehé1, F. Negoita, N.A. Orr2, S. Piétri2, E. Poirier1, M. Ramdhane, O. Roig3, I. Stefan, W. Wang

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.
1 :  DRS-IPHC - Département Recherches Subatomiques
2 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
3 :  DPTA - Département de Physique Théorique et Appliquée
Interactions fondamentales
Aval du cycle électronucléaire
structure nucléaire
Physique/Physique Nucléaire Expérimentale