Invariant-mass spectroscopy of Li-10 and Li-11
Journal article, 1997
Break-up of secondary Li-11 ion beams (280 MeV/nucleon) on C and Pb targets into Li-9 and neutrons is studied experimentally. Cross sections and neutron multiplicity distributions are obtained, characterizing different reaction mechanisms. Invariant-mass spectroscopy for Li-11 and Li-10 is performed. The E1 strength distribution, deduced from electromagnetic excitation of Li-11 up to an excitation energy of 4 MeV comprises similar to 8% of the Thomas-Reiche-Kuhn energy-weighted sumrule strength. Two low-lying resonance-like structures are observed for Li-10 at decay energies of 0.21(5) and 0.62(10) MeV, the former one carrying 26(10)% of the strength and likely to be associated with an s-wave neutron decay. A strong di-neutron correlation in Li-11 can be discarded. Calculations in a quasi-particle RPA approach are compared with the experimental results for Li-10 and Li-11. (C) 1997 Elsevier Science B.V.
Li-10 deduced resonances
NEUTRONS
E=280 MeV/nucleon
INTERACTION CROSS-SECTIONS
Pb(Li-11
BEAMS
breakup sigma
MOMENTUM DISTRIBUTIONS
features
multiplicity
measured neutron
Li-11
NUCLEAR RADII
gamma-decay associated sum-rule strengths
decay
BREAK-UP
ELECTROMAGNETIC DISSOCIATION
NUCLEAR REACTIONS C
chi n)
EXCITATION
FRAGMENTATION
STATES
Author
M. Zinser
F. Humbert
Thomas Nilsson
Department of Physics
W. Schwab
H. Simon
T. Aumann
M. J. G. Borge
L. V. Chulkov
J. Cub
T. W. Elze
H. Emling
H. Geissel
D. GuillemaudMueller
P. G. Hansen
R. Holzmann
H. Irnich
Björn Jonson
Department of Physics
J. V. Kratz
R. Kulessa
Y. Leifels
H. Lenske
A. Magel
A. C. Mueller
G. Munzenberg
F. Nickel
Göran Hugo Nyman
Department of Physics
A. Richter
K. Riisager
C. Scheidenberger
G. Schrieder
K. Stelzer
J. Stroth
A. Surowiec
Olof Tengblad
E. Wajda
E. Zude
Nuclear Physics A
0375-9474 (ISSN)
Vol. 619 1-2 151-176Subject Categories
Subatomic Physics
DOI
10.1016/S0375-9474(97)00134-6