Pair counting, pion-exchange forces, and the structure of light nuclei

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dc.creatorWiringa, R. B.
dc.date2006-01-21
dc.date.accessioned2026-07-07T11:28:21Z
dc.date.available2026-07-07T11:28:21Z
dc.descriptionA simple but useful guide for understanding the structure of light nuclei is presented. It is based on counting the number of interacting pairs in different spin-isospin (S,T) states for a given spatial symmetry, and estimating the overall binding according to the sum of sigma_i.sigma_j tau_i.tau_j expectation values, as suggested by one-pion-exchange. Applied to s- and p-shell nuclei, this simple picture accounts for the relative stability of nuclei as A increases and as T changes across isobars, the saturation of nuclear binding in the p-shell, and the tendency to form d, t, or alpha subclusters there. With allowance for pairwise tensor and spin-orbit forces, which are also generated or boosted by pion-exchange, the model explains why mixing of different spatial symmetries in ground states increases as T increases across isobars, and why for states of the same spatial symmetry, the ones with greater S are lower in the spectrum. The ordering of some sd-shell intruder levels can also be understood. The success of this simple model supports the idea that one-pion-exchange is the dominant force controlling the structure of light nuclei.
dc.description20 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/nucl-th/0601064
dc.identifierhttp://arxiv.org/abs/nucl-th/0601064
dc.identifierPhys.Rev.C73:034317,2006
dc.identifierdoi:10.1103/PhysRevC.73.034317
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196413
dc.subjectNuclear Theory
dc.titlePair counting, pion-exchange forces, and the structure of light nuclei
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