Darmstadt 2008 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 50: Kernphysik / Spektroskopie II
HK 50.6: Vortrag
Freitag, 14. März 2008, 15:30–15:45, 2G
Electroexcitation of the first 1/2+ state in 9Be and 11B* — •Oleksiy Burda1, Alex Brown2, Christian Forssén3, Peter von Neumann-Cosel1, and Achim Richter1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Germany — 2NSCL, Michigan State University, East Lancing, USA — 3Chalmers University of Technology, Göteborg, Sweden
There is renewed interest in very light nuclei due to the progress in ab initio calculations like the no-core shell model (NCSM) applied to their structure. We present high-resolution inelastic electron scattering experiments on 9Be and 11B performed at the S-DALINAC. The low-energy level structure of the 9Be nucleus has long been a matter of interest, in particular with respect to the strength of three-body α + α + n cluster configurations. The B(E1) strength for the transition to the 1/2+ state extracted from the longitudinal form factor is a factor of two smaller than found from real photon scattering experiments indicating a violation of Siegert′s theorem. In 11B, the longitudinal form factor of the transition to the 1/2+ state shows pronounced selectivity of a deep-hole 0s1/2→1p3/2 admixture to the dominant 1p3/2→1s1/2 configuration.
*Supported by the DFG through SFB 634.