Some recent attempts to take into account exchange currents and isobaric excitations in the electromagnetic and weak interactions of leptons with the deuteron are reviewed. After a presentation of the relevant theoretical framework the crucial experiments supporting strongly the exchange current ideas are discussed in some detail.

The reaction l~ was investigated with high resolution (5 keV) at the Munich MP tandem using the Q 3 D spectrograph in conjunction with the precision time-of-flight system. The ground state Q-value was determined as Q = 3,684.5_+ 1 keV. Proton spectra were measured at 7 angles in the range of 6.1~ ~ 19 levels could be identified in the excitation energy range 0-730 keV. Transferred /-values and spectroscopic factors of these levels were derived with the aid of DWBA calculations.

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