Invariant mass spectrum and alpha-n correlation function studied in the fragmentation of He-6 on a carbon target
Artikel i vetenskaplig tidskrift, 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
Författare
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, Institutionen för experimentell fysik, Subatomär fysik
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, Institutionen för experimentell fysik, Subatomär fysik
Göran Hugo Nyman
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
B. Petersen
M. Pfutzner
A. Richter
K. Riisager
C. Scheidenberger
G. Schrieder
W. Schwab
H. Simon
Martin Smedberg
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
M. Steiner
J. Stroth
A. Surowiec
T. Suzuki
O. O. Tengblad
Mikhail Zhukov
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
Nuclear Physics A
0375-9474 (ISSN)
Vol. 633 2 234-246Ämneskategorier
Subatomär fysik
DOI
10.1016/S0375-9474(98)00120-1