High-spin states in 48Ti

The 45Sc(α,pγ) reaction has been investigated at Esub(α) = 11, 12 and 13 MeV. The γ-decay of 198 levels in 48Ti up to 8,323 keV excitation energy has been observed. High-spin states were investigated by proton-γ ray angular correlation measurements at Esub(α) = 11 and 13 MeV and by DSAM lifetime measurements at Esub(α) = 11 MeV. From the combined evidence spin (-parity) assignments were obtained for the levels at Ex = 8,323 keV (J=108,6), 8,091(12,10,8,6), 7,668(10,8), 7,427(9,7), 7,374(119,7), 6,906(10,8,6), 6,172(8+,6+), 6,102(10+,8+), 6,039(6), 6,034(9+,7+), 5,630(7), 5,197(8+), 5,169(7+), 5,155(5), 4,404(5), 4,398(6+) and 4,046 keV (5). Most of the ambiguous spin assignments become unique if the 8,091 keV level has J = 12, an assumption which is favoured by its excitation function. The level spectrum thus obtained is well reproduced by shell model calculations in the pure (Integralsub(7/2))8 configuration space. Discrepancies exist in the reproduction of γ-decay modes. The reason is found in low-lying high-spin intruder states which include the 7,427 and 8,323 keV levels. The spectrum of negative-parity states is understood qualitatively by a comparison with 46Ti and 42Ca. (orig.)