Study of 47Ti with the 45Sc( 3He, p) 47Ti and 45Sc( 3He, pγ) 47Ti reactions

Abstract

The 45Sc( 3He, p) 47Ti reaction has been studied at E( 3 He) = 17 MeV by magnetic analysis with the Argonne split-pole spectrograph. The energy resolution was about 25 keV (FWHM). The excitation energies of 22 levels at excitations up to 7.5 MeV were determined, and the angular distributions associated with them were measured and analyzed in terms of two-nucleon transfer DWBA calculations. Angular distributions indicating orbital angular-momentum transfer L np = 0 were observed for two states: the analog state at 7.346 MeV and the 3.223 MeV state which is assumed to be the antianalog. The decay of the 47Ti levels was studied by measuring the p-γ coincidences in the 45Sc( 3He,pγ) reaction at E( 3 He) = 12 and 17 MeV, and level and decay schemes were established on the basis of the results. In the discussion of the properties of the 47Ti states, the results of the present work are compared with those obtained in one-nucleon transfer reactions, and all the data are compared with the results of calculations based on two different models for 47Ti. Comparing the reaction data with theory allows us to single out eleven 47Ti states that have simple configurations and are reasonably well described by theory. However, in examining the γ-decay data to obtain a more stringent test of the current models, we found the models incapable of accounting for the γ-decay of some of these simple states. In particular, the 1.548 MeV state, which seemed to have a large (f 7 2 ) 6( P 3 2 ) component, is not well described by the Coriolis-coupling model.