Gamma-ray angular distribution, angular correlation, linear polarization, and Doppler-shift attenuation measurements in the 46Ti(α, nγ)49Cr reaction

A detailed investigation of the electromagnetic properties of the 49Cr levels below 3 MeV has been made. The levels were populated by the 46Ti(α, nγ)49Cr reaction at E sub(α)=8 MeV. Analysis of measured gamma-ray angular distributions, linear polarizations, and gamma-gamma angular correlations has given the following unique spin and parity assignments: 9/2- to the 1083-keV level; 1/2- to the 1703-keV level; 5/2+ to the 2432-keV level; and 7/2- to the 2503-keV level. In addition, a unique 5/2 assignment has been given to the 2168-keV level. Lifetimes of some levels have been obtained from Doppler-shift attenuation measurements. New or revised values of branching ratios and mixing ratios have been determined for many transitions. The unique 5/2+ assignment to the 2432-keV level and a large B(E2) value obtained for the transition to the 1981-keV 3/2+ level suggest that the 2432-keV level is a member of the K sup(π)=3/2+ band built on the 1981-keV level. (auth.)