Abstract
The problem of the origin of the quadrupole deformation in the 6Li ground state is investigated with allowance for the three-deuteron component of the 6Li wave function. Two long-standing puzzles related to the tensor interaction in the 6Li nucleus are known: that of an anomalous smallness of the 6Li quadrupole moment (being negative, it is smaller in magnitude than the 7Li quadrupole moment by a factor of 5) and that of an anomalous behavior of the tensor analyzing power T2q in the scattering of polarized 6Li nuclei on various targets. It is shown that a large (in magnitude) negative exchange contribution to the 6Li quadrupole moment from the three-deuteron configuration cancels almost completely the “direct” positive contribution due to the αd folding potential. As a result, the total quadrupole moment proves to be close to zero and highly sensitive to fine details of the tensor nucleon-nucleon interaction in the 4He nucleus and of its wave function.
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