A new resonance peak has been found at 14.7 ± 0.2 MeV in spectra of inelastic electrons scattered from ${}_{}{}^{181}{}_{}{}^{}\mathrm{Ta}$. The peak exhausts a significant part of the $E0\mathrm{}$ sum rule and is characterized by a narrow width of about 2.1 MeV. The giant quadrupole resonances splits into two peaks at 9.5 ± 0.2 and 11.3 ± 0.2 MeV which deplete (29 ± 5)% and (63 ± 8)% of the isoscalar $E2\mathrm{}$ energy-weighted sum rule, respectively.

NUCLEAR REACTIONS ${}_{}{}^{181}{}_{}{}^{}\mathrm{Ta}(e,e^{\prime })$, measured ($E_{e^{\prime }},{\theta }_{e^{\prime }}$), $E_x=0\mathrm{}-30$ MeV, reduced $B\left(E0\mathrm{}\right)\mathrm{}$, $B\left(E2\mathrm{}\right)\mathrm{}$ for giant resonances.

• Received 27 December 1976

DOI:https://doi.org/10.1103/PhysRevC.16.1688