Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 24: Nuclear Physics / Spectroscopy III

HK 24.5: Talk

Wednesday, March 13, 2002, 12:15–12:30, B

Exclusive measurement of breakup reactions with the one-neutron halo nucleus ¹¹Be — •R. Palit — Institut für Kernphysik, Johann Wolfgang Goethe Universität,D-60486 Frankfurt, Germany

One-neutron removal reactions of 520 MeV/u ¹¹Be projectiles impinging on carbon and lead targets were studied in a kinematically complete experiment using the LAND set-up at GSI. The ¹⁰Be fragments, neutrons, as well as gamma-rays from the excited states of the fragment were detected in coincidence and the partial cross sections populating the ground and excited states of the core nucleus were deduced. The relative energy spectrum between the ¹⁰Be core and a neutron in the continuum was derived, yielding the spectroscopic factor for the neutron in the 2s halo state. The comparison of electromagnetic and nuclear contributions to the breakup will be presented. It has been found that Coulomb breakup predominantly populates the core ground state, while excited states account for only a few percent of the total cross section. Model calculations interconnecting the structure of ¹¹Be and the experimental cross sections will be presented.
Supported by BMBF (06OF112, 06MZ864) and by GSI (OF ELZ, MZ KRK).