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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Kernphysik / Spektroskopie
HK 25.3: Talk
Wednesday, March 14, 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 Wagner1 — 1Forschungszentrum 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.