γ-ray deexcitation of 50Ti states in the region of 4-MeV excitation

Nuclear properties of several ⁵⁰Ti states in the region of 4-MeV excitation were obtained using the ⁴⁸Ti(t,p)⁵⁰Ti reaction at a bombarding energy of E_t=2.9 MeV. Angular correlations of γ rays in time coincidence with protons detected in an annular particle detector positioned near 180° were obtained using an array of five NaI(T1) counters. Doppler-shift-attenuation measurements were also performed using a 20-cm³ Ge(Li) counter for the detection of γ rays. Analyses of these data yielded lifetime, excitation energy, and branching ratio information for some ⁵⁰Ti excited states. A unique spin assignment of J=2 was found for the 4.31-MeV state and the mixing ratio for the 4.31 --> 1.56-MeV transition was found to be δ=-0.26+/-0.17. Some of the measured excitation energies (keV) and lifetimes (psec) are: (3869.9 +/- 2.3, 0.60^+0.45_-0.20); (4150.4 +/- 6.3, not measured); (4179.2 +/- 4.2, <= 0.30); and (4310.7 +/- 3.0, < 0.08). NUCLEAR REACTIONS ⁴⁸Ti(t,p), E_t(t,p) MeV; measured σ(E_γ, θ_γ), E_γ, t₁₂, δ, Γ, deduced J, π for ⁵⁰Ti levels.