Title: Measurement of the Isoscalar Monopole Rsponse in the Neutron-Rich Nucleus Ni-68 (vol 113, 032504, 2014)
Authors: Vandebrouck, M
Gibelin, J
Khan, Enam
Achouri, N. L
Baba, H
Beaumel, D
Blumenfeld, Y
Caamano, M
Caceres, L
Colo, G
Delaunay, F
Fernandez-Dominguez, B
Garg, U
Grinyer, G. F
Harakeh, N
Kalantar-Nayestanaki, N
Keeley, N
Mittig, W
Pancin, J
Raabe, Riccardo
Roger, T
Roussel-Chomaz, P
Savajols, H
Sorlin, O
Stodel, C
Suzuki, D
Thomas, J. C
Issue Date: 2014
Publisher: American Physical Society
Series Title: Physical Review Letters vol:113 issue:5 pages:1-2
Abstract: The isoscalar monopole response has been measured in the unstable nucleus 68Ni using inelastic alpha
scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant
monopole resonance (ISGMR) centroid was determined to be 21.1 1.9 MeV and indications for a soft
monopole mode are provided for the first time at 12.9 1.0 MeV. Analysis of the corresponding angular
distributions using distorted-wave-born approximation with random-phase approximation transition
densities indicates that the L ¼ 0 multipolarity dominates the cross section for the ISGMR and
significantly contributes to the low-energy mode. The L ¼ 0 part of this low-energy mode, the soft
monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha
scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: DI
Appears in Collections:Nuclear and Radiation Physics Section
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