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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Kernphysik/Spektroskopie
HK 4.4: Talk
Monday, March 12, 2007, 18:45–19:00, D
Line shape of the first excited state in 9Be from high-resolution electron scattering* — •O. Burda, A. Byelikov, M. Chernykh, Y. Kalmykov, P. von Neumann-Cosel, I. Poltoratska, I. Pysmenetska, S. Rathi, A. Richter, N. Ryezayeva, A. Shevchenko, and O. Yevetska — Institut für Kernphysik, Technische Universität Darmstadt
The light odd-even nucleus 9Be has the lowest neutron threshold (Sn = 1.665 MeV) of all stable nuclei. Already the first excited Jπ = 1/2+ state lies at an
excitation energy of several tens of keV above the 8Be + n threshold. Parameters of this resonance are of great astrophysical importance. The description of this unbound level is long-standing problem. Due to its closeness to the neutron threshold the resonance has a strongly asymmetric line shape but despite a large number of different experiments there still exist discrepancies between the various deduced resonance parameters [1]. We present high-resolution 9Be(e,e′) experiments performed at the S-DALINAC and a reanalysis of our old electron scattering data [2].
F.C. Barker, Aust. J. Phys. 53 (2000) 247.
G. Küchler et al., Z. Phys. A 326 (1987) 447.
*Supported by the DFG through SFB 634.