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HK: Fachverband Physik der Hadronen und Kerne
HK 6: Structure and Dynamics of Nuclei II
HK 6.5: Talk
Monday, March 14, 2016, 15:30–15:45, S1/01 A04
Tensor Interaction Studies via High-Momentum Neutron Transfer Reaction, 16O(p,d), at the FRS — •Fabio Farinon for the S436 collaboration — GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
The contribution of the nuclear tensor force was investigated via the 16O(p,d) reaction with the FRS at different energies from 400 MeV/u to 1200 MeV/u centered at 0 degrees. Previously, it was measured at lower energies and at angles up to 25 degrees [1]. The measured deuteron spectrum reflects the ground state and various excitation levels of 15O. The required high momentum resolution was achieved by operating the FRS as a spectrometer in a complete dispersive ion-optical mode, where the resolving powers of the four dipole-magnet stages are added. The object size of the spectrometer was restricted by a stripe target of 1 mm in the dispersive direction. The measured deuteron spectra were compared with extended simulations. The results of cross-section ratios of the low-lying excited states to the ground state reflect the influence of the tensor force which cannot be explained by present mean field calculations.
[1] H.J. Ong et al. Phys. Lett. B 725 (2013) 277.