Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions
Artikel i vetenskaplig tidskrift, 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.

Författare

C. Lehr

Technische Universität Darmstadt

F. Wamers

Helmholtz

Technische Universität Darmstadt

F. Aksouh

Technische Universität Darmstadt

Helmholtz

Y. Aksyutina

Helmholtz

H. Alvarez-Pol

Universidade de Santiagode Compostela

L. Atar

Technische Universität Darmstadt

Helmholtz

T. Aumann

Technische Universität Darmstadt

Helmholtz

Helmholtz Forschungsakademie Hessen für FAIR (HFHF)

S. Beceiro-Novo

Universidade de Santiagode Compostela

C.A. Bertulani

Texas A&M University

K. Boretzky

Helmholtz

M. Borge

CSIC - Instituto de Estructura de la Materia (IEM)

C. Caesar

Technische Universität Darmstadt

Helmholtz

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

Chalmers, Fysik, Subatomär fysik och plasmafysik

Universidade de Santiagode Compostela

H. Emling

Helmholtz

O. Ershova

Johann Wolfgang Goethe Universität Frankfurt am Main

Helmholtz

L. M. Fraile

Universidad Complutense de Madrid

H. O. U. Fynbo

Aarhus Universitet

D. Galaviz

CSIC - Instituto de Estructura de la Materia (IEM)

H. Geissel

Helmholtz

M. Heil

Helmholtz

M. Heine

Technische Universität Darmstadt

D. H.H. Hoffmann

Technische Universität Darmstadt

Matthias Holl

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Helmholtz

Technische Universität Darmstadt

Håkan T Johansson

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Björn Jonson

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

C. Karagiannis

Helmholtz

O. A. Kiselev

Helmholtz

J. V. Kratz

Johannes Gutenberg-Universität Mainz

R. Kulessa

Uniwersytet Jagiellonski w Krakowie

N. Kurz

Helmholtz

C. Langer

Helmholtz

Johann Wolfgang Goethe Universität Frankfurt am Main

Mattias Lantz

Chalmers, Fysik

T. Le Bleis

Helmholtz

Technische Universität München

R. Lemmon

Cockcroft Institute

Y. Litvinov

Helmholtz

B. Loher

Technische Universität Darmstadt

Helmholtz

K. Mahata

Helmholtz

Bhabha Atomic Research Centre

J. Marganiec-Gałazka

Technische Universität Darmstadt

C. Muntz

Johann Wolfgang Goethe Universität Frankfurt am Main

Thomas Nilsson

Chalmers, Fysik

C. Nociforo

Helmholtz

W. Ott

Helmholtz

V. Panin

Technische Universität Darmstadt

Helmholtz

S. Paschalis

University of Liverpool

Helmholtz

A. Perea

CSIC - Instituto de Estructura de la Materia (IEM)

R. Plag

Helmholtz

Johann Wolfgang Goethe Universität Frankfurt am Main

R. Reifarth

Johann Wolfgang Goethe Universität Frankfurt am Main

Helmholtz

A. Richter

Technische Universität Darmstadt

K. Riisager

Aarhus Universitet

C. Rodriguez-Tajes

Universidade de Santiagode Compostela

D. M. Rossi

Technische Universität Darmstadt

Johannes Gutenberg-Universität Mainz

Helmholtz

D. Savran

Helmholtz

H. Scheit

Technische Universität Darmstadt

G. Schrieder

Technische Universität Darmstadt

P. Schrock

Technische Universität Darmstadt

H. Simon

Helmholtz

J. Stroth

Johann Wolfgang Goethe Universität Frankfurt am Main

Helmholtz

K. Summerer

Helmholtz

O. Tengblad

CSIC - Instituto de Estructura de la Materia (IEM)

H. Weick

Helmholtz

C. Wimmer

Helmholtz

Johann Wolfgang Goethe Universität Frankfurt am Main

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

0370-2693 (ISSN)

Vol. 827 136957

Ämneskategorier

Acceleratorfysik och instrumentering

Subatomär fysik

Teoretisk kemi

DOI

10.1016/j.physletb.2022.136957

Mer information

Senast uppdaterat

2022-03-02