Rigorous lower bounds to the percentage D state of the deuteron which improve Klarsfeld's (1974) previous estimates, are derived, assuming that the deuteron wavefunction is known outside different interaction radii. The sensitivity of the quadrupole moment (Q D ) to the deuteron wavefunction in the interior region is investigated by means of various finite-range unitary transformations and rigorous upper bounds are then obtained on the variation in Q D for arbitrary but finite-range transformations. Finally, it is shown that the experimental value of Q D , which is difficult if not impossible to fit with energy-independent interactions in the impulse approximation can be fitted if the pair current contribution to Q D is included. However an improved estimate of the minimum P D is not obtained in this way.
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Allen et al. (1978) studied this question.