Low-lying excited states of O²⁴ investigated by a self-consistent microscopic description of proton inelastic scattering

The proton inelastic scattering of O²⁴ (p,p') at 62 MeV/nucleon is described by a self-consistent microscopic calculation with the continuum particle-vibration coupling (cPVC) method. The SLy5, SkM*, and SGII parameters are adopted as alternative effective nucleon-nucleon interactions. For all the Skyrme parameters the cPVC calculation reproduces reasonably well the absolute values of the first and second peaks of the excitation energy spectrum of O²⁴ and the absolute value of the angular distribution corresponding to the first peak at 4.65 MeV. The relative energy between the two peaks is well reproduced by the cPVC method with SLy5 and SkM*. The role of the cPVC self-energy strongly depends on the effective interactions. The second peak around 7.3 MeV is suggested to be a superposition of the 3- and 4+ states by the results with SLy5 and SGII, whereas the SkM* calculation indicates it is a pure 3- state. This difference gives a rather strong interaction dependence of the angular distribution corresponding to the second peak.