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Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 16: Kernphysik/Spektroskopie II

HK 16.10: Vortrag

Dienstag, 18. März 2003, 18:15–18:30, A

The Dipole Response of Neutron-Rich Carbon and Nitrogen Isotopes — •Rudrajyoti Palit — Institut für Kernphysik, Johann Wolfgang Goethe Universität Frankfurt

The dipole response of unstable neutron-rich carbon and nitrogen isotopes has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at a beam energy of about 600 MeV/nucleon. This investigation extends earlier work performed for the oxygen isotope chain, where a strong fragmentation of the dipole strength was observed for the neutron-rich isotopes as compared with the previously measured for the stable isotope 16O [1]. A kinematically complete measurement of the neutron-decay channels in inelastic scattering of these secondary projectiles from a lead target was performed. The dipole strength distribution was extracted from the differential cross sections for electromagnetic excitation. In contrast to symmetric stable nuclei, a considerable fraction of the strength appears at low excitation energies, well below the giant dipole resonance.
Supported by BMBF

[1] A. Leistenschneider et al., Phys.Rev.Lett. 86 (2001) 5442.

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