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Phys Rev Lett. 2001 Jun 11;86(24):5442-5.

Photoneutron cross sections for unstable neutron-rich oxygen isotopes.

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Institut für Kernphysik, Johann Wolfgang Goethe-Universität, D-60486 Frankfurt, Germany.


The dipole response of stable and unstable neutron-rich oxygen nuclei of masses A = 17 to A = 22 has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at beam energies about 600 MeV/nucleon. A kinematically complete measurement of the neutron decay channel in inelastic scattering of the secondary beam projectiles from a Pb target was performed. Differential electromagnetic excitation cross sections d sigma/dE were derived up to 30 MeV excitation energy. In contrast to stable nuclei, the deduced dipole strength distribution appears to be strongly fragmented and systematically exhibits a considerable fraction of low-lying strength.

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