The unitary-model-operator approach to nuclear many-body problems
  Microscopic nuclear structure calculations have been performed within the framework of the unitary-model-operator approach. Ground-state and single-particle energies are calculated for nuclei around ^{14}C, ^{16}O and ^{40}Ca with modern nucleon-nucleon interactions. 
S. Fujii (1), R. Okamoto (2), K. Suzuki (2), ((1)Univ. of Tokyo,   (2)Kyushu Inst. of Tech.)