Abstract
The isoscalar monopole response has been measured in the unstable nucleus using inelastic alpha scattering at in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be and indications for a soft monopole mode are provided for the first time at . Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The 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 nuclei.
- Received 12 March 2014
- Publisher error corrected 18 July 2014
DOI:https://doi.org/10.1103/PhysRevLett.113.032504
© 2014 American Physical Society
Corrections
18 July 2014