Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 66: Struktur und Dynamik von Kernen

HK 66.3: Vortrag

Freitag, 23. März 2012, 14:45–15:00, P 4

Beyond the neutron drip-line - superheavy oxygens — •Christoph Caesar — TU Darmstadt, Institut für Kernphysik, 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 beam energies with the R3B-LAND-setup. This measurement provides improved data in several respects. The reaction was measured fully exclusive (including γ-ray detection) and with 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 as well as the ²⁷F(p,2p)²⁶O channel will be presented.

This work is supported by the Hessian LOEWE initiative through HIC for FAIR.

C.R. Hoffman et al. Phys.Rev.Lett 100 (2008) 152502