Probing the structure of exotic nuclei by transfer reactions
H. Lenske1 - G. Schrieder2
1 Institut für Theoretische Physik, Universität Giessen D-35392 Giessen, Germany
2 Institut für Kernphysik, TU Darmstadt D-64289 Darmstadt, Germany
Received: 1 October 1997 / Revised version: 25 November 1997 Communicated by D. Schwalm
Abstract
Low energy single nucleon transfer reactions are proposed as a tool to
investigate the structure of nuclei far off stability. Experimental
concepts and conditions are discussed, in particular high resolution
-ray spectroscopy after single nucleon pickup reactions. Nuclear
structure is described by Skyrme Hartree-Fock calculations including
pairing. As representative examples, binding energies, radii and wave
functions for Mg and Sn isotopes are calculated. In the neutron
deficient Mg isotopes a proton skin is found. At the neutron driplines
the Mg and Sn isotopes develop extended neutron skins. The nuclear
structure results are used in DWBA and EFR-DWBA transfer calculations.
Single nucleon transfer reactions of 32,36Mg and exotic Sn beams on
targets ranging from 2H to 24Mg in inverse kinematics are
explored. The one-nucleon transfer cross sections decrease strongly for
high-Z targets. An impact parameter analysis shows that the transfer
process is selective on the tails of the wave functions. The largest cross
sections are obtained for 2H and 9Be targets at incident energies
of Elab=2-5 MeV/u. The energy-momentum dependence is
closely related to the special properties of wave functions of weakly
bound states. Two-neutron (p,t) stripping reactions are studied for a 6He projectile.
A strong competition of sequential and direct processes is found at
low energies.
PACS
25.60.Je Transfer reactions -
21.60.Jz Hartree-Fock and random-phase approximations -
21.10.Gv Mass and neutron distributions
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