Speaker
Rituparna Kanungo
(Saint Mary's University)
Description
The two-neutron halo is a unique three-body system that has pushed the frontier of nuclear structure to discover new phenomena. An interesting question is whether the correlation of the two-neutrons can sustain a coherent oscillation giving rise to a soft dipole resonance. While this has been a subject of investigation since several years, a conclusive answer is not yet reached. The proton inelastic scattering of 11Li was found to show a peak at 1.3±0.1 MeV that was proposed to be the soft dipole resonance [1]. However, the resolution of this experiment does not allow a clear discrimination on whether the peak is a threshold effect or a dipole state. The recent Coulomb dissociation measurement of 11Li [2] on the other hand reports an enhancement around 0.6 MeV and is discussed to reflect the soft E1 mode. A resonance peak at 1.02±0.07 MeV was reported from the pion capture measurement [3].
Recent high precision inelastic scattering experiment at TRIUMF to investigate on resonance in 11Li will be presented. The formation of the neutron halo in 11Li is closely associated with the dynamic role of the core nucleus 9Li in binding the valence neutrons. We will report the first inelastic scattering measurement of 9Li to study the nature of excitation for its first excited state.
[1] A.A. Korshenninikov et al., Phys. Rev. Lett. 78(1997) 2317.
[2] T. Nakamura et al., Phys. Rev. Lett. 96 (1998) 252502.
[3] M.G. Gornov et al., Phys. Rev. Lett. 81 (1998) 4325.
Primary author
Rituparna Kanungo
(Saint Mary's University)
Co-authors
A. Valencik
(Astronomy and Physics Dept., Saint Mary's University, Halifax, Canada)
A.C. Shotter
(TRIUMF, Vancouver, Canada)
A.T. Gallant
(Dept. of Physics and Astronomy, University of British Columbia, Vancouver, Canada)
B. Davids
(TRIUMF, Vancouver, Canada)
C. Andreiou
(Dept. of Chemistry, Simon Fraser University, Burnaby, Canada)
D. Cross
(Dept. of Chemistry, Simon Fraser University, Burnaby, Canada)
D. Howell
(TRIUMF, Vancouver, Canada)
D. Niamir
(TRIUMF, Vancouver, Canada)
H. Alfalou
(Astronomy and Physics Dept., Saint Mary's University, Halifax, Canada)
H. Savajols
(GANIL, Caen, France)
I. Tanihata
(Research Center for Nuclear Physics, Osaka, Japan)
I.J. Thompson
(Lawrence Livermore National Laboratory, California, USA)
M. Djongolov
(TRIUMF, Vancouver, Canada)
M. Uchida
(Astronomy and Physics Dept., Saint Mary's University, Halifax, Canada)
N. Galinski
(TRIUMF, Vancouver, Canada)
N. Orce
(TRIUMF, Vancouver, Canada)
P. Walden
(TRIUMF, Vancouver, Canada)
R. Wiringa
(Argonne National Laboratory, Argonne, USA)
S. Campbell
(Astronomy and Physics Dept., Saint Mary's University, Halifax, Canada)
S. Pieper
(Argonne National Laboratory, Argonne, USA)
S. Reeve
(TRIUMF, Vancouver, Canada)
S. Triambak
(TRIUMF, Vancouver, Canada)
