Bonn 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 20: Struktur und Dynamik von Kernen IV

HK 20.7: Vortrag

Dienstag, 16. März 2010, 15:45–16:00, HG VII

Three-body correlations as a key to the structure of light unbound nuclei — •Yuliya Aksyutina — ExtreMe Matter Institute EMMI, GSI Darmstadt

The neutron dripline as being defined by the heaviest, proton-deficient, bound isotopes, determines the limit of nuclear stability at the neutron-rich side of the nuclear chart. Neutron or proton knockout from light dripline nuclei leads to the formation of unbound nuclear systems with extreme A/Z ratios, followed by their immediate decay. An experiment of this kind has been performed at GSI (Darmstadt). A relativistic beam consisting of the halo nuclei ¹¹Li and ¹⁴Be with energies of 280 and 305 MeV/nucleon, respectively, impinged on a liquid hydrogen target. The experimental setup, consisting of the neutron detector LAND, the dipole spectrometer ALADIN and different types of tracking detectors, allows the reconstruction of the momentum vectors of all reaction products measured in coincidence.

The properties of unbound nuclei were investigated by reconstructing the relative-energy spectra as well as by studying the energy and angular correlations between their decay products. The relative energy spectra were reconstructed for unbound nuclei ^9,10He and ^10,12,13Li. In addition, three-body ⁸He+n+n and ¹¹Li+n+n energy and angular correlations in ¹⁰He and ¹³Li were studied using the hyperspherical harmonics formalism, providing information about their structure. The talk is devoted to a discussion of the obtained results for these unbound isotopes and a physics interpretation of the data.

The project is supported by BMBF, EU(EURONS) and EMMI.