Chapter 2. Local Potential Approach to the Alpha-Nucleus Interaction and Alpha-Cluster Structure in Nuclei

α-Cluster States in Intermediate Mass Nuclei

“…It has been stated that this "concept of α-clustering is essential for understanding the structure of light nuclei" [3], and this concept has been extended to heavy nuclei (e.g. [4,5,6,7,8,9,10]). …”

“…Typical observables are scattering cross sections of the * Electronic address: WidmaierMohr@compuserve.de 4 He(α,α) 4 He reaction and excitation energies, transition probabilities, and decay properties of the 8 Be = α ⊗ α nucleus. A prerequisite for the successful application of the simple two-body model is an effective potential between the two α-particles.…”

“…Suppl. 132, [3,4,5,6,7,8,9,10]). However, there is no stable doubly-magic nucleus with the magic neutron number N = 50.…”

“…Previous studies (e.g. [4,12,13]) have been restricted to 94 Mo = 90 Zr ⊗ α because of the subshell closure at Z = 40 between f and p subshells and the proton g 9/2 subshell. It will be shown that there is no need for this restriction.…”

Refractive versus resonant diffraction scattering of loosely bound6Li nuclei

“…1 as the ratio to the Rutherford cross section, covers a large angular range. These data show complex forms with characteristic rapid oscillations at small angles followed by a marked change in shape at intermediate angles: a bump develops at θ ≈ 100 • (25.7 MeV) or a shallow minimum (29.8 MeV) which is followed by a significant increase of the cross section at larger angles, remembering the well known Anomalous Large Angle Scattering (ALAS), see a review in [18]. Assuming pure Fraunhofer scattering at forward angles, we extract a grazing angular momentum, l g ≈ 12, from the angular spacing ∆θ = π/(l g + 1/2).…”