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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 3: Electromagnetic and Hadronic Probes I

HK 3.8: Talk

Monday, March 8, 2004, 18:15–18:30, B

Single-Particle Structure of 7He from the 7Li(d,2He) Reaction* — •N. Ryezayeva1, C. Bäumer2, A. van den Berg3, D. Frekers2, D. De Frenne4, P. Haefner2, E. Jacobs4, H. Johanson5, B. Jonson6, Y. Kalmykov1, A. Negret4, P. von Neumann-Cosel1, L. Popescu4, S. Rakers2, A. Richter1, G. Schrieder1, A. Shevchenko1, H. Simon5, and H.J. Wörtche31Institut für Kernphysik, Techische Universität Darmstadt, Germany — 2Institut für Kernphysik, Universität Münster, Germany — 3KVI Groningen, Netherlands — 4Vakgroup Subatomaire en Strahlingsfysica, Universiteit Gent, Belgium — 5GSI Darmstadt, Germany — 6Chalmers University of Technology, Göteberg, Sweden

The spin-orbit interaction in neutron-rich nuclei is of much current interest because of the disappearance of the usual magic numbers in such nuclei. A recent GSI experiment [1] claims the observation of a low-lying state at Ex ≈ 0.7 MeV assumed to be the p1/2 spin-orbit partner of the 7He ground state. A study of the 7Li(d,2He)7He reaction has been performed at KVI searching for the allowed GT transition populating the p3/2p1/2 doublet. The unbound 2He system was identified by measuring coincidences between two protons with small relative energy. The setup at KVI offers a resolution Δ E/E ≈100 keV, better than the line width of the ground state of 7He. Data were obtained at Ed = 171 MeV and Θ2He = 0− 8. First results will be presented.

[1] M. Meister et al., Phys. Rev. Lett. 88, 102501 (2002).*Supported by the DFG under contract SFB 634.

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