Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions
Journal article, 2022
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→15⁎O+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.
Author
C. Lehr
Technische Universität Darmstadt
F. Wamers
Helmholtz
Technische Universität Darmstadt
F. Aksouh
Helmholtz
Technische Universität Darmstadt
Y. Aksyutina
Helmholtz
H. Alvarez-Pol
Universidade de Santiagode Compostela
L. Atar
Helmholtz
Technische Universität Darmstadt
T. Aumann
Technische Universität Darmstadt
Helmholtz Research Academy Hesse for FAIR (HFHF)
Helmholtz
S. Beceiro-Novo
Universidade de Santiagode Compostela
C.A. Bertulani
Texas A&M University
K. Boretzky
Helmholtz
M. Borge
Spanish National Research Council (CSIC)
C. Caesar
Helmholtz
Technische Universität Darmstadt
M. Chartier
University of Liverpool
A. Chatillon
Helmholtz
L. V. Chulkov
National Research Centre "Kurchatov Institute"
Helmholtz
D. Cortina-Gil
Universidade de Santiagode Compostela
Paloma Diaz Fernandez
Universidade de Santiagode Compostela
Chalmers, Physics, Subatomic and Plasma Physics
H. Emling
Helmholtz
O. Ershova
Goethe University Frankfurt
Helmholtz
L. M. Fraile
Complutense University
H. O. U. Fynbo
Aarhus University
D. Galaviz
Spanish National Research Council (CSIC)
H. Geissel
Helmholtz
M. Heil
Helmholtz
M. Heine
Technische Universität Darmstadt
D. H.H. Hoffmann
Technische Universität Darmstadt
Matthias Holl
Helmholtz
Technische Universität Darmstadt
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
Håkan T Johansson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
Björn Jonson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
C. Karagiannis
Helmholtz
O. A. Kiselev
Helmholtz
J. V. Kratz
Johannes Gutenberg University Mainz
R. Kulessa
Jagiellonian University in Kraków
N. Kurz
Helmholtz
C. Langer
Helmholtz
Goethe University Frankfurt
Mattias Lantz
Chalmers, Physics
T. Le Bleis
Technical University of Munich
Helmholtz
R. Lemmon
Cockcroft Institute
Y. Litvinov
Helmholtz
B. Loher
Helmholtz
Technische Universität Darmstadt
K. Mahata
Helmholtz
Bhabha Atomic Research Centre (BARC)
J. Marganiec-Gałazka
Technische Universität Darmstadt
C. Muntz
Goethe University Frankfurt
Thomas Nilsson
Chalmers, Physics
C. Nociforo
Helmholtz
W. Ott
Helmholtz
V. Panin
Helmholtz
Technische Universität Darmstadt
S. Paschalis
Helmholtz
University of Liverpool
A. Perea
Spanish National Research Council (CSIC)
R. Plag
Goethe University Frankfurt
Helmholtz
R. Reifarth
Goethe University Frankfurt
Helmholtz
A. Richter
Technische Universität Darmstadt
K. Riisager
Aarhus University
C. Rodriguez-Tajes
Universidade de Santiagode Compostela
D. M. Rossi
Technische Universität Darmstadt
Helmholtz
Johannes Gutenberg University Mainz
D. Savran
Helmholtz
H. Scheit
Technische Universität Darmstadt
G. Schrieder
Technische Universität Darmstadt
P. Schrock
Technische Universität Darmstadt
H. Simon
Helmholtz
J. Stroth
Goethe University Frankfurt
Helmholtz
K. Summerer
Helmholtz
O. Tengblad
Spanish National Research Council (CSIC)
H. Weick
Helmholtz
C. Wimmer
Helmholtz
Goethe University Frankfurt
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
0370-2693 (ISSN)
Vol. 827 136957Exotiska nukleära system vid gränsen för existens - fysik i frontlinjen med perspektiv mot FAIR
Swedish Research Council (VR) (2017-03839), 2018-01-01 -- 2021-12-31.
Subject Categories (SSIF 2011)
Accelerator Physics and Instrumentation
Subatomic Physics
Roots
Basic sciences
DOI
10.1016/j.physletb.2022.136957