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Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Kernphysik / Spektroskopie

HK 25.3: Vortrag

Mittwoch, 14. März 2007, 11:45–12:00, D

Dipole response of 88Sr up to the neutron-separation energy* — •Ronald Schwengner1, Nadia Benouaret1,2, Gencho Rusev1, Roland Beyer1, Friedrich Doenau1, Martin Erhard1, Eckart Grosse1,3, Arnd Junghans1, Joakim Klug1, Krasimir Kosev1, Latchesar Kostov4, Chitra Nair1, Nicolay Nankov1,4, Klaus-Dieter Schilling1, and Andreas Wagner11Forschungszentrum Dresden-Rossendorf, 01314 Dresden, Germany — 2Université d’Alger, 16111 Alger, Algerie — 3Technische Universität Dresden, 01062 Dresden, Germany — 4INRNE Sofia, 1784 Sofia, Bulgaria

Dipole and quadrupole excitations in the semimagic N=50 nucleus 88Sr were investigated at the superconducting electron linear accelerator ELBE with bremsstrahlung produced at electron energies of 9.0, 13.2, and 16.0 MeV. About 160 γ transitions were identified up to 12 MeV. By using polarized photons linear polarizations of about 50 γ transitions were measured. In the energy range of 6 – 12 MeV there is only one M1 transition while all other transitions have E1 character. Statistical methods were applied in order to filter out inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. The photoabsorption cross section obtained in this way provides information about the extension of the Giant Dipole Resonance towards energies below the neutron-separation energy. The experimental results are compared with existing data beyond the neutron-separation energy and with predictions of a Quasiparticle-Random-Phase-Approximation.
* Supported by the DFG under contract DO466/1-2.

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