Excitation of isovector giant resonances in 27Al by heavy ion charge exchange reaction.

Abstract

Excitation of isovector giant resonances in $^{27}\mathrm{Al}$ was studied by using the $^{27}\mathrm{Al}$${(}^{7}$Li, $^{7}\mathrm{Be}$${)}^{27}$Mg reaction at incident energies of 100, 150, and 180 MeV. We observed the analog of the giant dipole resonance at ${E}_{x}$=14.3 MeV in $^{27}\mathrm{Mg}$. From the observed excitation function, we suggest that a peak at ${E}_{x}$=9.5 MeV is a resonance with a higher multipolarity than one. In the excitation energy region higher than the giant dipole resonance, no resonance was observed.