Eur. Phys. J. A 10, 85-95

Potential and limitations of nucleon transfer experiments with radioactive beams at REX-ISOLDE

C. Gund¹, H. Bauer¹, J. Cub², A. Dietrich¹, T. Härtlein¹, H. Lenske³, D. Pansegrau¹, A. Richter², H. Scheit¹, G. Schrieder² and D. Schwalm<sup>1

1</sup>  Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
²  Institut für Kernphysik, Technische Universität Darmstadt, D-64298 Darmstadt, Germany
³  Institut für Theoretische Physik, Universität Gießen, D-35392 Gießen, Germany

heiko.scheit@mpi-hd.mpg.de

(Received: 9 October 2000 Communicated by J. Äystö)

Abstract
As a tool for studying the structure of nuclei far off stability the technique of -ray spectroscopy after low-energy single-nucleon transfer reactions with radioactive nuclear beams in inverse kinematics was investigated. Modules of the MINIBALL germanium array and a thin position-sensitive parallel plate avalanche counter (PPAC) to be employed in future experiments at REX-ISOLDE were used in a test experiment performed with a stable ³⁶S beam on deuteron and ⁹Be targets. It is demonstrated that the Doppler broadening of lines detected by the MINIBALL modules is considerably reduced by exploiting their segmentation, and that for beam intensities up to 10⁶ particles/s the PPAC positioned around zero degrees with respect to the beam axis allows not only to significantly reduce the background by requiring coincidences with the transfer products but also to control the beam and its intensity by single particle counting. The predicted large neutron pickup cross-sections of neutron-rich light nuclei on ²H and ⁹Be targets at REX-ISOLDE energies of 2.2 MeV are confirmed.

PACS
29.40.Cs - Gas-filled counters: ionization chambers, proportional, and avalanche counters.
29.30.Kv - X- and -ray spectroscopy.
25.60.Je - Transfer reactions.

© Società Italiana di Fisica, Springer-Verlag 2001