The differential cross section for the reaction 6 Zn(d, 6Li)6 Ni at 27.2 MeV, leading to the lowest 0+ and 2+ states was measured. The angular distributions show a diffraction pattern and forward peaking characteristic of a direct process. A distorted-wave Born-approximation (DWBA) calculation, in the zero-range approximation, with states represented by radial wave functions with %=5 and %=4 nodes for I =0 and L =2, respectively, was performed. The form factors correspond to the wave function of an 0. particle moving in a %'oods-Saxon potential. From the optical-model analysis the relative strength of the 0+ and 2+ states can be determined within 20% error. In addition, a DWBA calculation including structure factors obtained on the basis of the pairing-plus-quadrupole model, with a coherent sum over the center-of-mass radial quantum number N, was used. The predicted ratio 0(2+}/o'{0+}is 0.8 of the experimental value, with no significant difference in the shape of the angular distributions in both analyses.A number of papers' ' have emphasized the direct character of the (d, 'Li) reaction in light nuclei. In order to investigate whether this is also the case in the medium-mass region, and whether the cross sections are large enough to be useful as a tool in nuclear-structure studies, we measured the differential cross sections for the reaction "Zn(d, 'Li)"¹at 27.2 MeV.A self-supporting foil of enriched "Zn (98.5%) was bombarded with the 27.2-MeV deuteron beam of the Buenos Aires Synchrocyclotron, with an energy spread of 300 keV. An over-all energy resolution of 450 keV full width at half maximum was obtained.The experimental setup included two independent detection systems operating simultaneously. One of them consisted of a conventional EE-E telescope of solid-state detectors which allowed the passage of the light particles.The other one was a single detector thick enough (100 p, m) to stop only the most energetic lithium ions. The detectors, placed in symmetrical positions off the azimuthal plane, allowed for a continuous cross-check of the data for the same angle.The results are plotted in Fig. 1. TABLE I V raR az 8 D rN, a% roc (MeV) (fm) (fm) (MeV) (fm) (fm) (fm) Deuteron b Lithium 71.9 0.96 0.99 300 1.50 0.65 56 1. 35 0,75 1. 25 40 1. 50 0,65 2.50 a Woods -Saxon derivative. From Ref. 4.. The angular distributions for the 0'(g. s. ) and 2'(1.34 MeV) of "Ni show the diffraction structure and forward peaking characteristic of a direct-reaction mechanism. There is an indication of the surface localization of the reaction in the rather large decrease of the cross section at larger angles. The solid lines in Fig. 1 correspond to a DKBA calculation carried out with the code DWUCK in the zero-range approximation. The form factors we used correspond simply to the wave function of an z particle moving in a Woods-Saxon potential of radius, diffuseness, and depth (around 200 MeV) such as to bind, at the appropriate energy, the states represented by a radial wave function~with
