Experimental determination of some matrix elements of the effective residual interaction among particle-hole configurations in 208Pb

Matrix elements of the residual interaction in ²⁰⁸Pb are derived from the wavefunctions and the energies of states and configurations in ²⁰⁸Pb. From the experimentally determined wavefunctions of 20 low-lying states in ²⁰⁸Pb with spins I^π = 2^?, 3^?, 4^?, 5^?, 6^?, 7^? one obtains matrix elements of the effective residual interaction among particlehole configurations defined with respect to the physical ground state of ²⁰⁸Pb. The average value of these matrix elements is about 100 keV. No significant difference in the average value of the off-diagonal matrix elements is found for the different spin values. Also many nondiagonal matrix elements have values approaching the diagonal matrix elements.