Search

Using the 208Pb(p, p') reaction via isobaric analog resonances in 209Bi, a dozen states in the doubly magic nucleus 208Pb with major strength of the neutron particle-hole configuration \nu (\rm d{_{{5}/{2}}}^{+1} \rm p{_{{3}/{2}}}^{-1}) are investigated. Among them, two doublets at Ex = 5.81, 6.01 MeV are resolved by comparing the mean cross sections on the d5/2 resonance. The 5.81 MeV doublet consists of two states with major configuration \nu (\rm d{_{{5}/{2}}}^{+1} \rm p{_{{3}/{2}}}^{-1}) and spins 2[?] and 3[?]; the 2[?] state is newly identified. The distance between the two states is 0.4 +- 0.2 keV. The 6.01 MeV doublet consists of a 4[?] state with dominant configuration \nu (\rm d{_{{5}/{2}}}^{+1} \rm p{_{{3}/{2}}}^{-1}) and a 3[?] state with a small admixture of \nu (\rm d{_{{5}/{2}}}^{+1} \rm p{_{{3}/{2}}}^{-1}). The distance between the two states is 1.8 +- 0.3 keV. The 5886 state has been newly assigned the spin of 4[?]. The spins of seven more states are verified. Almost the complete \nu (\rm d{_{{5}/{2}}}^{+1} \rm p{_{{3}/{2}}}^{-1}) strength is identified in these 12 states. The center of gravity for the configuration \nu (\rm d{_{{5}/{2}}}^{+1} \rm p{_{{1}/{2}}}^{-1}) and \nu (\rm d{_{{5}/{2}}}^{+1} \rm p{_{{3}/{2}}}^{-1}) is in line with the predictions by the shell model without residual interaction to within 10 keV. [ABSTRACT FROM AUTHOR]