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Abstract
Twenty-one two-proton knockout (p,3p) cross sections were measured from neutron-rich nuclei at ∼250 MeV/nucleon in inverse kinematics. The angular distribution of the three emitted protons was determined for the first time, demonstrating that the (p,3p) kinematics are consistent with two sequential proton-proton collisions within the projectile nucleus. Ratios of (p,3p) over (p,2p) inclusive cross sections follow the trend of other many-nucleon removal reactions, further reinforcing the sequential nature of (p,3p) in neutron-rich nuclei.
Highlights
The angular distribution of the three emitted protons was determined for the first time, demonstrating that the ðp; 3pÞ kinematics are consistent with two sequential proton-proton collisions within the projectile nucleus
Introduction.—The nuclear shell model has been remarkably successful in describing the overall properties of atomic nuclei [1,2,3], but the structural evolution as a function of proton-to-neutron asymmetry remains an outstanding questions in quantum physics [4]
In this Letter we demonstrate that ðp; 3pÞ from neutronrich nuclei at intermediate energies takes place mainly through two sequential proton-proton collisions
Summary
Twenty-one two-proton knockout ðp; 3pÞ cross sections were measured from neutron-rich nuclei at ∼250 MeV/nucleon in inverse kinematics. Ratios of ðp; 3pÞ over ðp; 2pÞ inclusive cross sections follow the trend of other many-nucleon removal reactions, further reinforcing the sequential nature of ðp; 3pÞ in neutron-rich nuclei.
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