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Measurement of the dipole response of neutron-rich nuclei in the A∼20 region

✍ Scribed by U. Datta Pramanik; T. Aumann; A. Leistenschneider; K. Boretzky; D. Cortina; Th.W. Elze; H. Emling; H. Geissel; A. Grünschloß; M. Hellström; R. Holzmann; S. Ilievski; N. Iwasa; J.V. Kratz; R. Kulessa; Y. Leifels; E. Lubkiewicz; G. Münzenberg; P. Reiter; M. Rejmund; C. Scheidenberger; Ch. Schlegel; H. Simon; J. Stroth; K. Sümmerer; E. Wajda; W. Walus

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
118 KB
Volume
701
Category
Article
ISSN
0375-9474

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✦ Synopsis

Coulomb break up of the neutron-rich 15,17 C and 17-22 O isotopes has been studied experimentally using secondary beams at energies of 500-600 MeV/u. A comparison between differential cross sections, dσ/dE * , with that obtained from a binary model shows that the main ground-state configuration of 15 C is 14 C(0 + ) ⊗ ν S 1/2 as expected. For 17 C, our preliminary data analysis reveals that the predominant (∼ 64%) configuration of the ground state is 16 C(2 + ) ⊗ ν s,d . For 17-22 O, the low-lying E1 strength amounts up to about 12% of the energy weighted sum rule strength depending on neutron number. The energy weighted E1 strength (integrated up to 15 MeV excitation energy) increases up to 20 O then decreases for 21,22 O. These data are compared to a shell model calculation.

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