Analyzing powers were measured for the reactions 116 Sn(£,a0 113 ln and 112 Cd(£,ce) 109 Ag at 22 o 0 MeV. A strong J dependence distinguishing between 1/2" and 3/2" states was observed in both reactions. The analyzing powers are well reproduced by the distortedwave Born approximation using a triton-cluster form factor.We report here results of measurements of the analyzing power in reactions 11G Sn(p, a) 113 ln and ll2 Cd(p, o?) 109 Ag induced by polarized protons. A number of measurements on direct (p, a) reaction cross sections have been made earlier. 1 However, to our knowledge no measurements of the analyzing power for the direct (p, a) reaction have been published. 2 The angular distribution of the cross sections observed in the (p, a) reaction is known to depend on J, the total angular momentum transferred, rather than on L, the orbital angular momentum transferred. 3 It is also known that a strong J dependence was observed, distinguishing between \~ and I" final states c 4 The observed shapes of the angular distribution can be well reproduced by a cluster-transfer distorted-wave Born approximation (DWBA).The purposes of the present experiment are to see whether a pronounced J dependence can be observed in the analyzing powers distinguishing between i" and I" states as observed in the cross sections and to what extent the analyzing power can be described by the cluster pickup mechanism.The experiment was performed with a 22-MeV polarized proton beam from a tandem accelerator using a Lamb-shift polarized-ion source at The University of Tsukuba. 5 The beam intensity was about 80 nA on target and the degree of polarization was typically 85%. The 116 Sn and 112 Cd targets were Sn0 2 and CdO with thicknesses of about 500 and 300 /ig/cm 2 , respectively, both enriched to 96% in 116 Sn and 112 Cd, which had been either deposited or sputtered onto 4-/im Mylar foils. The emitted particles were momentum analyzed using a magnetic spectrograph (ESP-90, Scanditronix, Sweden) and detected using a 5-cmlong position-sensitive solid-state detector placed in the focal plane. The energy resolution was about 100 keV for the 116 Sn target and 60 keV for the 112 Cd target with a solid angle of 2 msr (A0 = 1.5°). The analyzing power, A y (0), at each angle was obtained by reversing the polarization of the beam at the source,, In Fig. 1 the analyzing-power results are shown for the reaction 116 Sn(p, a) 113 ln, together with the differential cross sections. These measured states, except the I" state, are considered to be mainly the lg 9/2 , 2/> 1/2 , and 2p 3/2 proton-hole states of 113 In on the basis of the systematic study of the (p, a) reaction on even-even tin nuclei. 1 The observed A y (0)'s show clear differences for the four different states. A strong Jdependent difference between I" and I" states was observed in A y (9) as well as in the cross secEx^O^SMeV 1 ! 2 ^ 1 0 20 40 60 80 20 40 60 80 6cm. (d eg) FIG. 1. Angular distributions of cross sections and analyzing powers for the reaction 116 Sn(jp,a) il3 In at 22.0...