München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Structure and Dynamics of Nuclei V

HK 27.5: Talk

Tuesday, March 19, 2019, 17:45–18:00, HS 14

Determination of exclusive (p,3p) cross sections for neutron-rich medium mass nuclei — •Axel Frotscher — TU Darmstadt, Darmstadt, Deutschland

The knockout of nucleons from nuclei is a powerful tool to investigate nuclear structure. In particular, the knockout of nucleons at energies above 200 MeV/nucleon from a hydrogen target, so called quasi free scattering, is believed to be a clean probe for nuclear structure and have led to several recent experimental programs and theoretical developments. In this work, we are interested to reactions that lead to the removal of two nucleons. Indeed, it was observed in several occurrences that a different states of a nucleus are populated when produced from one nucleon knockout (p,2p) or two nucleon knockout (p,3p). So far, there is no proper reaction theory for this second class of reactions. Understanding it might provide a new tool to investigate nuclear structure.

The analysis of two experimental campaigns conducted at the RIBF in RIKEN, Japan, is presented here. The (p,3p) cross sections from several neutron-rich medium-mass nuclei were analysed. The radioactive nuclei were impinging onto a 100-mm long liquid hydrogen target. The protons issued from the reaction were measured with the MINOS tine-projection chamber surrounding the target, giving access for the first time to angular correlations of the protons in the final state in such reactions. Inclusive and exclusive cross sections have been extracted.

This work is supported by the DFG through grant no. SFB1245.