MOMENTUM DISTRIBUTIONS IN STRIPPING REACTIONS OF SINGLE-NUCLEON HALO NUCLEI

The widths of the longitudinal momentum distributions of projectilelik e fragments produced in (Be-11, Be-10+n) and in (B-8,Be-7+p) breakup r eactions are analyzed using a single-particle description. The strong absorption limit of the Serber model reproduces both data sets quite a ccurately. The transparent limit, on the other hand, can reproduce the width of the Be-11 data reasonably well but it fails dramatically for the B-8 data. The reason is that the absorption of the projectilelike fragment has a much larger effect on the width when the orbital angul ar momentum of the valence nucleon is nonzero.