Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 67: Struktur und Dynamik von Kernen XI
HK 67.3: Vortrag
Freitag, 25. März 2011, 14:45–15:00, A-1
Neutron-rich oxygen nuclei beyond the dripline studied at the R3B-LAND-setup — •Christoph Caesar — TU Darmstadt, Germany
The neutron unbound-ground state of 25O was recently observed for the first time in a proton knock-out reaction from a 26F beam on a beryllium target at the NSCL[1]. One single resonance was observed in the 24O+n relative-energy spectrum. Shell-model calculations which describe known properties of neighboring oxygen isotopes, however, fail in reproducing the surprisingly low energy of the observed resonance.
The R3B-collaboration has studied the 26F(p,2p)25O reaction utilizing a kinematically complete measurement at relativistic energies with the R3B-LAND-setup. This measurement provides improved data in several respects. The reaction was measured fully exclusive (including γ-ray detection) with higher statistics and much larger acceptance.
In addition, a sufficient number of events have been recorded which populate the 26O ground state in order to estimate its mass.
First results on the 26F(p,2p)25O channel will be presented.
C.R. Hoffman et al. Phys.Rev.Lett 100 (2008) 152502