Three-body correlations in electromagnetic dissociation of Borromean nuclei: The He-6 case
Journal article, 2005
Dissociation of He-6 on a lead target has been studied at 240 MeV/u. The four-momenta of the two neutrons in coincidence with alpha-particles have been measured and used to reconstruct the three-body energy and angular correlations in the final state. For the first time, three-body correlations were included in the analysis of the He-6 dissociation data, and compared with calculations assuming a dipole mode for the electromagnetic dissociation. In addition, the experimental data have been analyzed using a series expansion of the final transition amplitude into hyperspherical functions, showing the importance of both nn and alpha n final-state interactions. It is shown that the dissociation process is governed by a transition of one neutron from the p-shell in the 6He ground state to the s-shell in the continuum further indicating that the role of the transition through an intermediate He-5(3/2(-)) state is more important than expected. (c) 2005 Elsevier B.V. All rights reserved.
Coulomb excitation
GENERAL-ORDER COLLISIONS
HALO NUCLEI
TERTIARY
particle correlations
FRAGMENTATION
He-6
EXCITATIONS
RESONANCE
unstable nuclei
Author
L. V. Chulkov
H. Simon
I. J. Thompson
T. Aumann
M. J. G. Borge
T. W. Elze
H. Emling
H. Geissel
L. V. Grigorenko
M. Hellstrom
Björn Jonson
Chalmers, Applied Physics, Subatomic Physics
J. W. V. Kratz
R. Kulessa
K. Markenroth
Mikael Meister
G. Munzenberg
F. Nickel
Thomas Nilsson
Chalmers, Applied Physics, Subatomic Physics
Göran Hugo Nyman
Chalmers, Applied Physics, Subatomic Physics
V. Pribora
A. Richter
K. Riisager
C. Scheidenberger
G. Schrieder
O. Tengblad
Mikhail Zhukov
Chalmers, Applied Physics, Subatomic Physics
Nuclear Physics A
0375-9474 (ISSN)
Vol. 759 1-2 23-42Subject Categories
Subatomic Physics
DOI
10.1016/j.nuclphysa.2005.05.001