Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 37: Nuclear Structure/Spectroscopy VI

HK 37.4: Vortrag

Donnerstag, 11. März 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.