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Abstract
Probability distributions for the excitation of the 1ħω multipole resonances E1, M6, and M2 in the sd-shell nuclei 18O, 22Ne, 24Mg, 26Mg, 27Al, 28Si, 32S, and 40Ca were obtained by means of the spectroscopy of direct pickup reactions within the particle-core coupling (PCC) version of the multiparticle shell model. The deviation of the ground state of a nucleus featuring A nucleons from the case of closed shells or subshells manifests itself in a broad range of the energy distribution of holes among states of (A − 1) nuclei. This energy spread is the main source of the fragmentation of multipole resonances in open-shell nuclei. A comparison of PCC theoretical results with experimental data confirms the applicability of the approach used over a broad range of momentum transfers and proves the existence of connections between direct and resonance processes.
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