Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 37: Nuclear Structure/Spectroscopy VI
HK 37.4: Talk
Thursday, March 11, 2004, 14:45–15:00, A
Low-lying resonances in the halo-nucleus 6He — •P. Haefner1, C. Bäumer1, A. van den Berg2, D. Frekers1, D. De Frenne3, E.-W. Grewe1, M.N. Harakeh2, M. Hunyadi2, E. Jacobs3, H. Johansson4, B. Junk1, A. Korff1, A. Negret3, P. von Neumann-Cosel5, L. Popescu3, S. Rakers1, A. Richter5, N. Ryezayeva5, A. Shevchenko5, and H.J. Wörtche2 — 1Westfälische Wilhelms-Universität Münster — 2Kernfysisch Versneller Instituut, Groningen — 3Universiteit Gent — 4GSI, Darmstadt — 5TU Darmstadt
Measurements of the (d,2He) charge exchange reaction were performed on 6Li at an incident energy of 85 MeV/A to investigate the structure of the halo-nucleus 6He. A laboratory angle of 0∘ to 15∘ was covered. The energy resolution was 130 keV (FWHM). As the two protons of 2He are measured in coincidence, the spectra are free of instrumental background.
We analysed angular distributions for the ground state transition, the first excited 2+-state at 1.797 MeV and the broad resonances up to 25 MeV. The weakly bound nucleus 6He serves as a prototype for so-called Borromean systems (α + n + n). The resonances seen in our experiment will be compared to theoretical predictions of three-body models.
Supported by the EU as LIFE-Project under HPRI-1999-CT-00109.