Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Structure and Dynamics of Nuclei X

HK 59.2: Talk

Friday, April 3, 2020, 11:30–11:45, J-HS E

The (p,3p) reaction mechanism: a sequential process — •Axel Frotscher and Mario Gómez for the SEASTAR15 collaboration — 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 different final states in a nucleus are populated when produced from one nucleon knockout (p,2p) or from two nucleon knockout (p,3p). The understanding of the later could provide a new tool for nuclear spectroscopy.

The analysis of two experimental campaigns conducted at the RIBF in RIKEN, Japan, is presented here. The proton distribution 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 time-projection chamber surrounding the target, giving access for the first time to angular correlations of the three protons in the final state. The obtained proton distributions have been benchmarked against kinematical models assuming three different reaction mechanisms.

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