Spin determination of valence and inner hole states via the 208Pb(d-vector,t)207Pb reaction at Ed=200 MeV

Highly excited neutron hole states in 207Pb were studied via the (d-vector,t) reaction at 200 MeV, using for the first time a polarized beam with both vector and tensor components. The determination of overlapping neutron hole response functions takes advantage of the strong characteristic features of j-=l-1/2 versus j+=l+1/2 level analysing powers and of the good DWBA description of the reaction. The results are compared in details with those, previously obtained on the 1i13/2 and 1h9/2 valence state fragmentation up to Ex=6.7 MeV and on the 1h11/2 strength up to ∼10 MeV. The present experiment settles the attributions of several j- versus j+ valence groups and indicates that the 1h9/2 strength is spread up to ∼10.8 MeV. The spin orbit splitting of 1h orbitals in 208Pb deduced from the strength centroids is 5.2 MeV. (R.P.) 32 refs.; 9 figs.; 6 tabs