Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions



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Lehr, C. and Wamers, F. and Aksouh, F. and Aksyutina, Yu. and Álvarez Pol, H. and Atar, L. and Aumann, T. and Beceiro Novo, S. and Bertulani, C.A. and Boretzky, K. and Borge, M.J.G. and Caesar, C. and Chartier, M. and Chatillon, A. and Chulkov, L.V. and Cortina Gil, D. and Díaz Fernández, P. and Emling, H. and Ershova, O. and Fraile Prieto, Luis Mario and Fynbo, H.O.U. and Galaviz, D. and Geissel, H. and Heil, M. and Heine, M. and Hoffmann, D.H.H. and Holl, M. and Johansson, H.T. and Jonson, B. and Karagiannis, C. and Kiselev, O.A. and Kratz, J.V. and Kulessa, R. and Kurz, N. and Langer, C. and Lantz, M. and Le Bleis, T. and Lemmon, R. and Litvinov, Yu.A. and Löher, B. and Mahata, K. and Marganiec Galązka, J. and Müntz, C. and Nilsson, T. and Nociforo, C. and Ott, W. and Panin, V. and Paschalis, S. and Perea, A. and Plag, R. and Reifarth, R. and Richter, A. and Riisager, K. and Rodriguez Tajes, C. and Rossi, D. and Savran, D. and Scheit, H. and Schrieder, G. and Schrock, P. and Simon, H. and Stroth, J. and Sümmerer, K. and Tengblad, O. and Weick, H. and Wimmer, C. (2022) Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions. Physics Letters B, 827 . p. 136957. ISSN 03702693

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Official URL: https://doi.org/10.1016/j.physletb.2022.136957


The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne(p, 2p)16F∗ →15O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of 16F into 15O (including γ decays from excited states) and a proton, as well as the 15O+p relative-energy spectrum and the 16F momentum distributions. The latter two quantities allow an independent and consistent determination of the fractions of l = 0 and l = 2 motion of the valence protons in 17Ne. With a resulting relatively small l = 0 component of only around 35(3)%, it is concluded that 17Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and 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, which explains previously reported contradicting conclusions derived from inclusive cross sections

Item Type:Article
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Particles
ID Code:74474
Deposited On:08 Sep 2022 14:08
Last Modified:08 Sep 2022 14:14

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