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arXiv · 2610.39036

Configuration-Interaction Studies of Alpha Clustering in Atomic Nuclei

Brandon Roldan Tomei·Alexander Volya
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Abstract

Clustering in atomic nuclei, and $α$ clustering in particular, is a striking form of self-organization in quantum many-body systems, emerging from nucleon--nucleon interactions through the interplay of correlations, symmetry constraints, and continuum coupling. We summarize a configuration-interaction approach in which cluster degrees of freedom are built from center-of-mass boosted fragment wave functions and treated with resonating-group techniques. The norm kernel plays an important role: Pauli blocking suppresses cluster channels at small separations, restructures the relative-motion wave functions, and governs the normalization of clustering strength. As the central development we present a Green's function (GF) method that aids in resolving a long-standing difficulty of harmonic-oscillator based configuration interaction calculations that stems from wave functions with Gaussian asymptotics. The method restores the correct asymptotic behavior and extracts the asymptotic normalization coefficient (ANC) with high accuracy even in very modest harmonic-oscillator spaces. The value of the ANC is very sensitive to the exact position of the state relative to threshold, and yet the GF method establishes the ANC as a structural observable that can be determined precisely from the interior wave function using the experimentally or otherwise known exact energy. A self-consistent iteration, formulated as an integral-operator eigenvalue problem, is also shown to recover both the energy and the ANC in cases when the energy of the state is to be determined. The method is illustrated for near-threshold states, such as the weakly bound $1^-$ state of $^{16}$O, as well as for the ground states of $^{16}$O and $^{20}$Ne.

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Brandon Roldan Tomei, Alexander Volya. 2026-10-28. Configuration-Interaction Studies of Alpha Clustering in Atomic Nuclei. https://arxiv.org/abs/2610.39036

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