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Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 43: Kernphysik/Spektroskopie VI

HK 43.2: Talk

Thursday, March 20, 2003, 17:00–17:15, A

Coulomb breakup of the near-dripline nucleus 23O — •Chiara Nociforo — Institut für Kernchemie, Johannes-Gutenberg Universität Mainz

The ground-state structure of the one-neutron halo candidate 23O has been investigated by an exclusive measurement of the one-neutron Coulomb breakup reaction at high energy (≈ 500 MeV/u). The structure of this nucleus is presently subject to a controversial discussion, and different ground-state spins have been proposed. The differential cross section for electromagnetic excitation is very sensitive to the spatial extension of the neutron wave function, and thus allows the determination of the orbital angular momentum of the valence neutron, while the coincident measurement of γ-rays allows the determination of the final core state populated [1]. A ground state spin of 1/2+ for 23O is obtained from our measurement. The valence neutron is with a large occupation probability in an s state coupled to the 22O ground state giving rise to a halo-like structure.
Supported by BMBF

[1] U. Datta Pramanik et al., Phys. Lett. B, to be published.

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