Nuclear structure studies with radioactive beams at GSI

T. Aumann, A. Leistenschneider, U. Datta Pramanik, K. Boretzky, D. Cortina, J. Cub, W. Dostal, Th W. Elze, H. Emling, H. Geissel, A. Grünschloß, M. Hellström, R. Holzmann, S. Ilievski, N. Iwasa, M. Kaspar, A. Kleinböhl, J. V. Kratz, R. Kulessa, Y. LeifelsE. Lubkiewicz, G. Münzenberg, P. Reiter, M. Rejmund, C. Scheidenberger, C. Schlegel, H. Simon, J. Stroth, K. Sümmerer, E. Wajda, W. Walus, S. Wan

研究成果: Conference article査読

1 被引用数 (Scopus)

抄録

The electromagnetic excitation process at beam energies around 500 MeV/u is utilized to probe the dipole response of light neutron-rich nuclei. The secondary beams are produced in fragmentation reactions and separated by the GSI fragment separator FRS. By measuring the neutron decay after inelastic scattering on a Pb target in a kinematically complete experiment, the differential electromagnetic excitation cross sections dσ/dE* are derived. The oxygen isotope chain is studied systematically ranging from A = 17 to A = 22. Low-lying dipole strength is observed, exhausting about 10% of the energy-weighted dipole sum rule for excitation energies below 15 MeV. Even though this soft dipole excitation is present in all neutron-rich oxygen isotopes investigated, the cluster sum rule associated with the dipole motion of the valence nucleons against the 16O core is only fully exhausted for 18O. For the halo nuclei 11Be and 15,17C it is shown that detailed spectroscopic information on the ground state single particle structure can be deduced from the 'threshold' dipole strength.

本文言語English
ページ(範囲)111-118
ページ数8
ジャーナルActa Physica Hungarica New Series Heavy Ion Physics
12
2-4
出版ステータスPublished - 2000
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(全般)

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