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
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
F. Aksouh
Helmholtz Association of German Research Centres
Technische Universität Darmstadt
Y. Aksyutina
Helmholtz Association of German Research Centres
H. Alvarez-Pol
Universidade de Santiagode Compostela
L. Atar
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
T. Aumann
Helmholtz Association of German Research Centres
Technische Universität Darmstadt
S. Beceiro-Novo
Universidade de Santiagode Compostela
C.A. Bertulani
Texas A&M University
K. Boretzky
Helmholtz Association of German Research Centres
M. Borge
Spanish National Research Council (CSIC)
C. Caesar
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
M. Chartier
University of Liverpool
A. Chatillon
Helmholtz Association of German Research Centres
L. V. Chulkov
National Research Centre "Kurchatov Institute"
Helmholtz Association of German Research Centres
D. Cortina-Gil
Universidade de Santiagode Compostela
Paloma Diaz Fernandez
Chalmers, Physics, Subatomic and Plasma Physics
Universidade de Santiagode Compostela
H. Emling
Helmholtz Association of German Research Centres
O. Ershova
Goethe University Frankfurt
Helmholtz Association of German Research Centres
L. M. Fraile
Complutense University
H. O. U. Fynbo
Aarhus University
D. Galaviz
Spanish National Research Council (CSIC)
H. Geissel
Helmholtz Association of German Research Centres
M. Heil
Helmholtz Association of German Research Centres
M. Heine
Technische Universität Darmstadt
D. H.H. Hoffmann
Technische Universität Darmstadt
Matthias Holl
Technische Universität Darmstadt
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
Helmholtz Association of German Research Centres
Håkan T Johansson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
Björn Jonson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
C. Karagiannis
Helmholtz Association of German Research Centres
O. A. Kiselev
Helmholtz Association of German Research Centres
J. V. Kratz
Johannes Gutenberg University Mainz
R. Kulessa
Jagiellonian University in Kraków
N. Kurz
Helmholtz Association of German Research Centres
C. Langer
Goethe University Frankfurt
Helmholtz Association of German Research Centres
Mattias Lantz
Chalmers, Physics
T. Le Bleis
Helmholtz Association of German Research Centres
Technical University of Munich
R. Lemmon
Cockcroft Institute
Y. Litvinov
Helmholtz Association of German Research Centres
B. Loher
Helmholtz Association of German Research Centres
Technische Universität Darmstadt
K. Mahata
Helmholtz Association of German Research Centres
Bhabha Atomic Research Centre (BARC)
J. Marganiec-Gałazka
Technische Universität Darmstadt
C. Muntz
Goethe University Frankfurt
Thomas Nilsson
Chalmers, Physics
C. Nociforo
Helmholtz Association of German Research Centres
W. Ott
Helmholtz Association of German Research Centres
V. Panin
Helmholtz Association of German Research Centres
Technische Universität Darmstadt
S. Paschalis
University of Liverpool
Helmholtz Association of German Research Centres
A. Perea
Spanish National Research Council (CSIC)
R. Plag
Helmholtz Association of German Research Centres
Goethe University Frankfurt
R. Reifarth
Helmholtz Association of German Research Centres
Goethe University Frankfurt
A. Richter
Technische Universität Darmstadt
K. Riisager
Aarhus University
C. Rodriguez-Tajes
Universidade de Santiagode Compostela
D. M. Rossi
Johannes Gutenberg University Mainz
Technische Universität Darmstadt
Helmholtz Association of German Research Centres
D. Savran
Helmholtz Association of German Research Centres
H. Scheit
Technische Universität Darmstadt
G. Schrieder
Technische Universität Darmstadt
P. Schrock
Technische Universität Darmstadt
H. Simon
Helmholtz Association of German Research Centres
J. Stroth
Helmholtz Association of German Research Centres
Goethe University Frankfurt
K. Summerer
Helmholtz Association of German Research Centres
O. Tengblad
Spanish National Research Council (CSIC)
H. Weick
Helmholtz Association of German Research Centres
C. Wimmer
Goethe University Frankfurt
Helmholtz Association of German Research Centres
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