ISOBARIC ANALOG STATE OF LI-11

The isobaric analog state (IAS) of the halo nucleus Li-11 has been inv estigated using the charge exchange reaction Li-11(p,n)Be-11 in inver se kinematics at E(Li-11) = 64A MeV. The IAS was observed in Be-11, fo r the first time, at an excitation energy of 21.16 +/- 0.02 MeV with a width of 0.49 +/- 0.07 MeV (FWHM). The unit cross section, distortion factor and effective N-N interaction associated with the Fermi transi tion are extracted. Coulomb displacement energy, decay width, reaction variables and their relation to the halo structure are discussed. (C) 1997 Elsevier Science B.V.