Abstract
We formulate a core plus few-nucleon model allowing for a rotational excitation of the core. Three and four-body systems including a 12C core nucleus are studied using an explicitly correlated Gaussian basis. Effects of the core excitation are tested by investigating energy levels and electric quadrupole transition probabilities. Though some improvements are obtained, we realize that the Pauli principle for the nucleon-deformable core motion has to be appropriately defined for better understanding.
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