Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 24: Nuclear Physics / Spectroscopy III
HK 24.1: Gruppenbericht
Mittwoch, 13. März 2002, 10:45–11:15, B
Cluster Knockout from Halo Nuclei — •L.V. Chulkov — Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany — Russian Research Centre “Kurchatov Institute”, R-123182 Moscow, Russia
Quasi-elastic scattering of a proton on a cluster inside the halo nuclei 6He and 8He has been studied at relativistic energies. The purpose of the experiment is to determine the spectroscopic factor of the α-cluster in 6He and in 8He and the relative contribution of the 6He*+2n configuration in the 8He wave function. These quantities are of vital importance for understanding the structure of halo nuclei. Additionally, the 4He projectile was used as a bench mark nucleus to illustrate the kinematics of different reaction mechanisms.
The experimental setup consisted of a 600 mg/cm2 liquid hydrogen target, a forward spectrometer for tracking and identifying the projectile fragments and position sensitive detectors for the detection of the recoil protons. The direction of the fragment has been measured together with the momentum vector of the recoil proton. The processes of valence neutron or α-cluster knockout dominate the reaction mechanism. These processes are well separated by the reaction kinematics through the correlations in azimuthal and polar angles of the detected particles.
The combination of the relativistic energy beams with the comprehensive kinematical analysis provides a direct method to determine the structure of exotic nuclei. The experiment has no analogy with any other radioactive beam experiments and the experimental data obtained are unique.