Abstract
Strength distributions for isoscalar giant resonances with multipolarity have been determined in from “instrumental background-free” inelastic scattering of 386-MeV particles at extreme forward angles, including . The isoscalar , and strengths are observed to be , and , respectively, of their energy-weighted sum rules in the excitation energy range of 6 to 35 MeV. The isoscalar giant monopole (ISGMR) and quadrupole (ISGQR) resonances exhibit a prominent splitting which is consistent with microscopic theory for a prolate-deformed ground state of . For the ISGQR it is due to splitting of the three components, whereas for the ISGMR it is due to its coupling to the component of the ISGQR. Deformation effects on the isoscalar giant dipole resonance are less pronounced, however.
- Received 21 February 2016
DOI:https://doi.org/10.1103/PhysRevC.93.044324
©2016 American Physical Society