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

  • 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.

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Author:Christopher LehrGND, Felix WamersGND, Farouk Aksouh, Yuliya AksyutinaGND, Héctor Álvarez-PolORCiD, Leyla AtarORCiDGND, Thomas AumannORCiDGND, Saul Beceiro-NovoORCiD, Carlos A. BertulaniORCiDGND, Konstanze BoretzkyORCiD, Maria J. G. Borge, Christoph CaesarORCiDGND, Marielle ChartierORCiD, Audrey Chatillon, Leonid V. ChulkovORCiD, Dolores Cortina GilORCiD, Paloma Díaz FernándezORCiD, Hans Emling, Olga ErshovaGND, Luis M. Fraile PrietoORCiD, Hans Otto Uldall FynboORCiD, Daniel Galaviz RedondoORCiDGND, Hans GeisselORCiD, Michael Heil, Marcel HeineORCiDGND, Dieter H. H. HoffmannORCiDGND, Matthias HollGND, Håkan T. JohanssonORCiD, Björn JonsonORCiDGND, Christos Karagiannis, Oleg A. Kiselev, Jens-Volker KratzORCiDGND, Reinhard Kulessa, Nikolaus KurzORCiD, Christoph LangerGND, Mattias LantzORCiD, Tudi Le Bleis, Roy Crawford LemmonORCiD, Yuri A. LitvinovORCiDGND, Bastian LöherORCiDGND, Kripamay MahataORCiD, Justyna Marganiec-GalązkaORCiD, Christian Müntz, Thomas NilssonORCiD, Chiara Nociforo, Wolfgang Ott, Valerii PaninORCiDGND, Stefanos PaschalisORCiD, Angel Perea MartinezORCiD, Ralf Plag, René ReifarthORCiD, Achim RichterGND, Karsten Riisager, Carme Rodriguez-TajesORCiD, Dominic M. RossiORCiDGND, Deniz SavranGND, Heiko ScheitORCiDGND, Gerhard SchriederGND, Philipp SchrockGND, Haik SimonGND, Joachim StrothORCiD, Klaus Sümmerer, Olof TengbladORCiD, Helmut Weick, Christine Wimmer
Parent Title (English):Physics Letters B
Place of publication:Amsterdam
Document Type:Article
Date of Publication (online):2022/02/15
Date of first Publication:2022/02/15
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/09/30
Page Number:6
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0