Halo structure of (14)Be.
The two-neutron halo nucleus (14)Be has been investigated in a kinematically complete measurement of the fragments ((12)Be and neutrons) produced in dissociation at 35 MeV/nucleon on C and Pb targets. Two-neutron removal cross sections, neutron angular distributions, and invariant mass spectra were measured, and the contributions from electromagnetic dissociation (EMD) were deduced. Comparison with three-body model calculations suggests that the halo wave function contains a large nu(2s(1/2))(2) admixture. The EMD invariant mass spectrum exhibited enhanced strength near threshold consistent with a nonresonant soft-dipole excitation.
Labiche
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Laboratoire de Physique Corpusculaire, ISMRA et Université de Caen, France.
Orr
N A
NA
Marqués
F M
FM
Angélique
J C
JC
Axelsson
L
L
Benoit
B
B
Bergmann
U C
UC
Borge
M J
MJ
Catford
W N
WN
Chappell
S P
SP
Clarke
N M
NM
Costa
G
G
Curtis
N
N
D'Arrigo
A
A
de Góes Brennand
E
E
Dorvaux
O
O
Fazio
G
G
Freer
M
M
Fulton
B R
BR
Giardina
G
G
Grévy
S
S
Guillemaud-Mueller
D
D
Hanappe
F
F
Heusch
B
B
Jones
K L
KL
Jonson
B
B
Le Brun
C
C
Leenhardt
S
S
Lewitowicz
M
M
Lopez
M J
MJ
Markenroth
K
K
Mueller
A C
AC
Nilsson
T
T
Ninane
A
A
Nyman
G
G
de Oliveira
F
F
Piqueras
I
I
Riisager
K
K
Saint Laurent
M G
MG
Sarazin
F
F
Singer
S M
SM
Sorlin
O
O
Stuttgé
L
L