Core-breakup reactions of the halo nuclei Be-11 and Li-11: momentum distributions and shadow effects
Journal article, 1999
The halo nuclei Be-11 and Li-11 have been studied in core-breakup reactions where the halo neutrons are expected to be released without a major distortion due to the reaction. The widths of the halo-neutron momentum distributions have been extracted in coincidence with He fragments, Gamma = 32 +/- 4 MeV/c, and Li fragments, Gamma = 42 +/- 4 MeV/c for Be-11 and with He fragments, Gamma =42+/-6 MeV/c for Li-11. The Be-11 breakup gives a very low neutron multiplicity of 0.38+/-0.09 which is a manifestation of the shadowing of the neutron in the core-breakup reaction. This value can be understood from a simple theoretical calculation, which also accounts for the observed transverse momentum widths at small angles. (C) 1999 Elsevier Science B.V.
UP REACTIONS
widths
ONE-NEUTRON HALO
HE-6
REMOVAL
halo nuclei
radioactive beams
STRIPPING REACTIONS
core-breakup reactions
momentum
shadowing
Author
S. Grevy
L. Axelsson
J. C. Angelique
R. Anne
D. Guillemaud-Mueller
P. G. Hansen
P. Hornshoj
Björn Jonson
Chalmers, Department of Experimental Physics, Subatomic Physics
M. Lewitowicz
A. C. Mueller
Thomas Nilsson
Chalmers, Department of Experimental Physics, Subatomic Physics
Göran Hugo Nyman
Chalmers, Department of Experimental Physics, Subatomic Physics
N. A. Orr
F. Pougheon
K. Riisager
M. G. Saint-Laurent
Martin Smedberg
Chalmers, Department of Experimental Physics, Subatomic Physics
O. Sorlin
Nuclear Physics A
0375-9474 (ISSN)
Vol. 650 1 47-61Subject Categories
Subatomic Physics
DOI
10.1016/S0375-9474(99)00102-5