The projected shell model

The projected shell model (PSM) provides a shell model treatment of heavy n uclei. through diagonalization of a pairing plus quadrupole Hamiltonian in an angular momentum projected zero-, two-, and four-quasiparticle basis (fo r even-even systems). Calculated energy levels and electromagnetic transiti on amplitudes are in good agreement with the experimental data. Taking Dy-1 60 as an example we exhibit the effect of changing the residual interaction strengths on the spectra. It is clearly seen that there are many J(pi) = 0 (+), 1(+), 4(+) bandheads whose energies can only be reproduced using the s elf-consistent strengths. It is concluded that there ore no free parameters in the PSM.