The standard and renormalized coupled cluster methods with singles, doubles,and noniterative triples and their generalizations to excited states, based onthe equation of motion coupled cluster approach, are applied to the He-4 andO-16 nuclei. A comparison of coupled cluster results with the results of theexact diagonalization of the Hamiltonian in the same model space shows that thequantum chemistry inspired coupled cluster approximations provide an excellentdescription of ground and excited states of nuclei. The bulk of the correlationeffects is obtained at the coupled cluster singles and doubles level. Triples,treated noniteratively, provide the virtually exact description.
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