Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 10: Kernphysik/Spektroskopie
HK 10.3: Vortrag
Freitag, 4. März 2005, 17:30–17:45, TU MA005
Dipole strength in 112Sn up to 9 MeV from resonant photon scattering⋆ — •B. Özel1, M. Babilon1, J. Enders1, H. von Garrel2, O. Karg1, U. Kneissl2, C. Kohstall2, P. von Neumann-Cosel1, H. H. Pitz2, I. Poltoratska1, V. Yu. Ponomarev1, I. Pysmenetska1, A. Richter1, M. Scheck2, F. Stedile2, S. Volz1, and S. Walter2 — 1Institut für Kernphysik, Technische Univeristät Darmstadt — 2Institut für Strahlenphysik, Universität Stuttgart
The 112Sn(γ,γ′) reaction was studied at endpoint energies of the incident bremsstrahlung spectrum of 3.8 MeV, 5.5 MeV, 7.0 MeV, and 9.5 MeV at the Stuttgart Dynamitron accelerator and the superconducting Darmstadt electron linear accelerator S–DALINAC. Dipole strength distributions have been extracted from the measured data. Around 3.4 MeV excitation energy, a candidate for the quadrupole-octupole-coupled E1 excitation has been identified which is discussed with respect to the systematics established in 116,118,120,122,124Sn by Bryssinck et al. [1]. At higher energies, a concentration of dipole excitations is observed between 5 and 8 MeV. The strength of this so-called pygmy dipole resonance is compared to existing data for 116,124Sn [2] and to quasiparticle-phonon model calculations.
[1] J. Bryssinck et al., Phys. Rev. C 59, 1930 (1999)
[2] K. Govaert et al., Phys. Rev. C 57, 2229 (1998) ⋆Work supported by the DFG through SFB 634.