Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 34: Nuclear and Particle Astrophysics II
HK 34.2: Vortrag
Mittwoch, 10. März 2004, 14:30–14:45, F
Photon scattering off 124,128,130,132,134Xe and the systematics of low-lying dipole strength in the mass region of a nuclear shape transition — •H. von Garrel1, P. von Brentano2, C. Fransen2, G. Friessner2, N. Hollmann2, J. Jolie2, F. Käppeler3, L. Käubler4, U. Kneissl1, C. Kohstall1, L. Kostov4, A. Linnemann2, D. Mücher2, N. Pietralla2, H.H. Pitz1, G. Rusev3,4, R. Schwengner4, M. Scheck1, S. Walter1, V. Werner2, and K. Wisshak3 — 1Inst. für Strahlenphysik, Univ. Stuttgart — 2Inst. für Kernphysik, Univ. zu Köln — 3Inst. für Kernphysik, FZ-Karlsruhe — 4INRNE, Sofia
The Xenon isotopic chain with 9 stable isotopes presents an appropriate case to study spectroscopic properties of nuclei in the mass region of a nuclear shape transition. Starting from the spherical, magic 136Xe (N=82) the chain ends at the γ-soft isotopes 126,124Xe. In the present study the low-lying dipole strength distributions were investigated by high-resolution photon scattering experiments. All measurements were performed at the bremsstrahlung facility at the Stuttgart 4.3 MV Dynamitron with photon beams of an end point energy of 4 MeV. These novel photon scattering experiments on gaseous targets were possible due to the development of thin-walled, high-pressure gas targets at the FZ-Karlsruhe. After first test measurements using natural Xe gas, up to now systematic studies of 124,128,130,132,134Xe were carried out. First results are presented and discussed mainly in respect to the E1 two-phonon excitations of the quadrupole-octupole coupled type (2+⊗ 3−).
Supported by DFG under contracts Kn 154/31 and Pi 393/1-2