Isovector Quadrupole Resonance Observed in the 60Ni(13C, 13N)60Co Reaction at E/A=100 MeV

Isovector non-spin-flip giant resonances were observed in the reaction ⁶⁰Ni(¹³C, ¹³N)⁶⁰Co at E/A = 100 MeV. Besides the giant dipole resonance at E_x = 8.7 MeV, another resonance has been observed at E_x = 20 MeV with a width of 9 MeV. A comparison of its angular distribution with Distorted-wave Born approximation calculations indicates that this resonance is excited by L=2 and carries about 50 % of the sum-rule limit strength for the giant quadrupole resonance.