Invariant mass spectrum and alpha-n correlation function studied in the fragmentation of He-6 on a carbon target
Journal article, 1998
Momentum distributions and invariant mass spectra from the breakup of He-6 ions with an energy of 240 MeV/u interacting with a carbon target have been studied. The data were used to extract information about the reaction mechanism which is influenced by the structure of He-6. It is found that the dominant reaction mechanism is a two-step process: knock out of one neutron followed by the decay of the He-5 resonance. The shape of the (alpha+n) two-body invariant mass spectrum is interpreted as mainly reflecting the 5He ground state which is a J(pi) = 3/2(-) resonance. However, no evidence for correlations between cu particles and neutrons is observed in the momentum widths of the distributions. It is demonstrated that a combined analysis of the two-body invariant mass spectrum and an appropriate correlation function may be used to determine the properties of the intermediate resonance. (C) 1998 Elsevier Science B.V.
Halo nuclei
mechanism
secondary radioactive beams
breakup reactions
momentum distributions
exotic nuclei
MOMENTUM DISTRIBUTIONS
invariant mass spectra
fragmentation
ENERGY
He-5
He-6
Author
D. Aleksandrov
T. Aumann
L. Axelsson
T. Baumann
M. J. G. Borge
L. V. Chulkov
J. Cub
W. Dostal
B. Eberlein
T. W. Elze
H. Emling
H. Geissel
V. Z. Goldberg
M. Golovkov
A. Grunschloss
M. Hellstrom
J. Holeczek
R. Holzmann
Björn Jonson
Chalmers, Department of Experimental Physics, Subatomic Physics
A. A. Korshenninikov
J. V. Kratz
G. Kraus
R. Kulessa
Y. Leifels
A. Leistenschneider
T. Leth
I. Mukha
G. Munzenberg
F. Nickel
Thomas Nilsson
Chalmers, Department of Experimental Physics, Subatomic Physics
Göran Hugo Nyman
Chalmers, Department of Experimental Physics, Subatomic Physics
B. Petersen
M. Pfutzner
A. Richter
K. Riisager
C. Scheidenberger
G. Schrieder
W. Schwab
H. Simon
Martin Smedberg
Chalmers, Department of Experimental Physics, Subatomic Physics
M. Steiner
J. Stroth
A. Surowiec
T. Suzuki
O. O. Tengblad
Mikhail Zhukov
Chalmers, Department of Experimental Physics, Subatomic Physics
Nuclear Physics A
0375-9474 (ISSN)
Vol. 633 2 234-246Subject Categories
Subatomic Physics
DOI
10.1016/S0375-9474(98)00120-1