Evidence of soft dipole resonance in ^{11}li with isoscalar character.
Kanungo R, Sanetullaev A, Tanaka J, Ishimoto S, Hagen G, Myo T, Suzuki T, Andreoiu C, Bender P, Chen AA, Davids B, Fallis J, Fortin JP, Galinski N, Gallant AT, Garrett PE, Hackman G, Hadinia B, Jansen G, Keefe M, Krücken R, Lighthall J, McNeice E, Miller D, Otsuka T, Purcell J, Randhawa JS, Roger T, Rojas A, Savajols H
Physical review letters 2015
The first conclusive evidence of a dipole resonance in ^{11}Li having isoscalar character observed from inelastic scattering with a novel solid deuteron target is reported. The experiment was performed at the newly commissioned IRIS facility at TRIUMF. The results show a resonance peak at an excitation energy of 1.03±0.03 MeV with a width of 0.51±0.11 MeV (FWHM). The angular distribution is consistent with a dipole excitation in the distorted-wave Born approximation framework. The observed resonance energy together with shell model calculations show the first signature that the monopole tensor interaction is important in ^{11}Li. The first ab initio calculations in the coupled cluster framework are also presented.