doi: 10.1103/PhysRevLett.86.5442.
Photoneutron cross sections for unstable neutron-rich oxygen isotopes
A Leistenschneider 1, T Aumann, K Boretzky, D Cortina, J Cub, U Datta Pramanik, W Dostal, T W Elze, H Emling, H Geissel, A Grünschloss, M Hellstr, R Holzmann, S Ilievski, N Iwasa, M Kaspar, A Kleinböhl, J V Kratz, R Kulessa, Y Leifels, E Lubkiewicz, G Münzenberg, P Reiter, M Rejmund, C Scheidenberger, C Schlegel, H Simon, J Stroth, K Sümmerer, E Wajda, W Walús, S Wan
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- PMID:11415271
- DOI: 10.1103/PhysRevLett.86.5442
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Photoneutron cross sections for unstable neutron-rich oxygen isotopes
A Leistenschneider et al. Phys Rev Lett..
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Abstract
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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