Contents § 1. Introduction and summary 1.1. Viewpoint of cluster correlations in non-alpha-nuclei 1.2. Interactions between few-nucleon clusters 1.3. Motion of individual nucleons in molecule-like nuclei 1.4. Multi-cluster model for non-alpha-nuclei 1.5. Alpha and three-nucleon cluster states in lightest sd-shell and A=15 nuclei § 2. Interactions between few-nucleon clusters 2.1. Realistic effective nuclear potentials 2.2. N-a interaction 2.3. d-a interaction and distortion effect of deuteron 2.4. Excited states in A=4 system with 3N+N cluster model § 3. Molecular structure in the 8 Be-core region 3.1. Motion of a nucleon around a 8 Be·core 3.2. Molecular orbital model . Structure of 9 Be nucleus 3.4. Structure of 10 B nucleus 3.5. Structure of neutron-rich Be-and B-isotopes § 4. Three-cluster model of the A=lO and 11 nuclei 4.1. Orthogonality condition model § 5. 4.2. 2a + t cluster model of 11 B nucleus 4.3. 2a+d cluster model of 10 B and 10 Be nuclei 4.4. Effect of the complete antisymmetrization Alpha and three-nucleon cluster states in lightest nuclei 5.1. Structure of A=19 nuclei 5.2. Structure of A=l8 nuclei 5.3. Structure of A=l7 nuclei 5.4. Structure of A=l5 nuclei § 1. Introduction and summary sd-shell 1.1. Viewpoint of cluster correlations in non-alpha-nuclei and A=151.1.1. The light nuclei (we consider in this chapter the P-shell and lightest sd-shell nuclei) have a relatively small number of nucleons, and their characters vary remarkably from nucleus to nucleus, showing strong individuality. Even in these light nuclei we see the persistency of saturation property which is considered a fundamental property of overall nuclei. In light nuclei, the saturation property emerges through formation of the acluster as a saturating subunit. This is the fundamental aspect prescribing the characteristics of light nuclei. The basic viewpoint of a-cluster structure in light nuclei has been presented in Ref. 1). As stated in detail in the previous chapter, 2 l recent investigations on light a-nuclei 3 l~el exhibit a remarkable success of the a-cluster model, which provides us with a comprehensive understanding of nuclear structure including quite high excited states, where coexistence of the shell and cluster structures and structure change between them can be understood in a unified way. Now we naturally proceed to an extensive investigation of non-a-nuclei from the cluster-model viewpoint. 1.1.2.The structure of light nuclei has been explained mostly in terms of the intermediate-coupling shell model or the deformed shell model, like the Nilsson model and the deformed Hartree-Fock method. They assume the formation of a static one-center single-particle field. The 9 Be nucleus, on the other hand, has long been considered a prototype of the molecule-like structure of nuclei, in which two a-particles constitute a stable dumbbell-like core and a remaining (valence) neutron moves on a single-particle orbital at NERL on May 26, 2015 http://ptps.oxfordjournals.org/ Downloaded from tion, which is an "elementary interaction...

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A ('He+ 16 0+A) and (a+ 15 0+A) channel coupling cluster model of ,:\,Ne is presented. The energy spectra, RMS radii and spectroscopic factors are calculated. The ground state with unusual negative parity is predicted and is shown to be the result of the different responses of shell structure and cluster structure to the glue· like role of A particle. How to test the predicted negative parity ground state experimentally is discussed. § 1. Introduction

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