Acta Physica Polonica B

Vol. 32, No. 3, March 2001, page 1095

Electromagnetic Excitation of Neutron-Rich Oxygen Nuclei 17-22O

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

The dipole response of neutron-rich oxygen nuclei 17-22O has been studied using the electromagnetic excitation process in heavy ion collisions at beam energies around 600 MeV/nucleon. The subsequent neutron decay after inelastic scattering of the secondary beam projectiles on a Pb target was measured in a kinematically complete experiment. Differential electromagnetic excitation cross sections were deduced up to 30 MeV excitation energy. For all isotopes low-lying E1 strength was obtained exhausting between 5% and 12% of the energy-weighted dipole sum rule.

PACS numbers: 21.10.Pc, 21.10.Re, 24.30.Cz, 25.60.--t

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