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Properties of the 7He ground state from 8He neutron knockout

Journal article
Authors Yuliya Aksyutina
Håkan T. Johansson
T. Aumann
K. Boretzky
M.J.G. Borge
A. Chatillon
L.V. Chulkov
D. Cortina-Gil
U. Datta Pramanik
H. Emling
Christian Forssén
H.O.U. Fynbo
H. Geissel
G. Ickert
Björn Jonson
R. Kulessa
C. Langer
Mattias Lantz
T. LeBleis
Anton Lindahl
K. Mahata
Mikael Meister
G. Münzenberg
Thomas Nilsson
Göran Nyman
R. Palit
S. Paschalis
W. Prokopowicz
R. Reifarth
A. Richter
K. Riisager
G. Schrieder
H. Simon
K. Sümmerer
Olof Tengblad
H. Weick
Mikhail V. Zhukov
Published in Physics Letters B
Volume 679
Issue 3
Pages 191 - 196
ISSN 0370-2693
Publication year 2009
Published at Department of Physics (GU)
Pages 191 - 196
Language en
Subject categories Heavy ion physics, Low energy physics


The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α+n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ=1/2− state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.

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