The nuclides ' K, Ca, and ' Sc have been produced by fragmentation of a uranium target with a 600 MeV proton beam. The subsequent P decays to the daughter nuclei '2Ca, ' Sc, and ' Ti have been studied by neutron and y spectroscopy on sources obtained from on-line mass separation. P decay energies have been determined by P-y coincidence spectroscopy. In addition to the short halflife of K (Tl&2 --110+30 ms), we attributed two different half-lives (Tlq2 --4.6+0.3 s and Tl~2 --8.2+0.2 s) to ' Ca and ' Sc, respectively. A decay scheme has been established for ' K involving five P branches to delayed neutron emitting states between 6.6 and 10.3 MeV and one P branch to a bound level at E"=2.56 MeV. The ' Ca decay scheme accounts for 13 branches to four levels at 1.64, 2.75, 3.46, and 4.27 MeV for which the deduced logft values restrict the angular momentum and parity to J =1+. For the "Sc ground state, strong P transitions to the 2+ (1.05 MeV) and the (4+) (2.32 MeV) levels in '2Ti strongly favor a J =3+ attribution. The measured gp values for the Ca (5.7+0.2 MeV) and Sc (8.02+0.25 MeV) decay are noticeably lower than expected from mass systematics. The energy level diagrams of ' Ca, Sc, and ' Ti nuclei have been calculated in the framework of the shell model with a realistic interaction. Good agreement between theory and experiment is achieved as well for excitation energies as for mass excesses, assuring then the applicability of the theory to this region of nuclei far from stability.

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The location of several single-neutron states in 133 Sn has been identified. The p 3͞2 , h 9͞2 , and f 5͞2 states were found at 853.7, 1560.9, and 2004.6 keV, respectively, by measuring g rays in coincidence with delayed neutrons following the decay of 134 In. Crucial for obtaining the new data were the improved yields at the mass-separator facility ISOLDE-PSB at CERN. A semiempirically adjusted Woods-Saxon calculation, based on parameters from the Pb region and normalized on the mass data at 132 Sn, reproduces the new single particle energies with good precision. [S0031-9007(96)00824-1]