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The proton drip-line nucleus 17Ne is investigated experimentally in order todetermine its two-proton halo character. A fully exclusive measurement of the17Ne(p,2p)16F->15O+p quasi-free one-proton knockout reaction has been performedat GSI at around 500 MeV/nucleon beam energy. All particles resulting from thescattering process have been detected. The relevant reconstructed quantitiesare the angles of the two protons scattered in quasi-elastic kinematics, thedecay of 16F into 15O (including gamma decays from excited states) and aproton, as well as the 15O+p relative-energy spectrum and the 16F momentumdistributions. The latter two quantities allow an independent and consistentdetermination of the ratio of l=0 and l=2 motion of the valence protons in17Ne. With a resulting relatively small l=0 component of only around 35(3)%, itis concluded that 17Ne exhibits a rather modest halo character only. Thequantitative agreement of the two values deduced from the energy spectrum andthe momentum distributions supports the theoretical treatment of thecalculation of momentum distributions after quasi-free knockout reactions athigh energies by taking into account distortions based on the Glauber theory.Moreover, the experimental data allow the separation of valence-proton knockoutand knockout from the 15O core. The latter process contributes with 11.8(3.1)mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, whichexplains previously reported contradicting conclusions derived from inclusivecross sections.

Unveiling the Two-Proton Halo Character of 17Ne: Exclusive Measurement of Quasi-free Proton-Knockout Reactions