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. Wörtche³ — ¹Institut 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 E_x ≈ 0.7 MeV assumed to be the p_1/2 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 p_3/2−p_1/2 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 E_d = 171 MeV and Θ_²He = 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.