We present a calculation of the giant dipole resonance in ${}^{16}\mathrm{O}$ based on a nucleon-nucleon ($NN$) interaction from chiral effective field theory that reproduces $NN$ scattering data with high accuracy. By merging the Lorentz integral transform and the coupled-cluster methods, we extend the previous theoretical limits for breakup observables in light nuclei with mass numbers ($A\le 7$) and address the collective giant dipole resonance of ${}^{16}\mathrm{O}$. We successfully benchmark the new approach against virtually exact results from the hyperspherical harmonics method in ${}^4\mathrm{He}$. Our results for ${}^{16}\mathrm{O}$ reproduce the position and the total strength (bremsstrahlung sum rule) of the dipole response very well. When compared to the cross section from photoabsorption experiments, the theoretical curve exhibits a smeared form of the peak. The tail region between 40 and 100 MeV is reproduced within uncertainties.

• Received 29 March 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.122502