Nuclear and Atomic Physics


Quantum Chromodynamics Based Model: a New Perspective on Halo-Structure and New-Magicity in Exotic Nuclei

Authors: Syed Afsar Abbas

A quite recent, ingenious experimental paper (Raabe et al., Nature 431 (2004) 823), studied fusion of an incoming beam of halo nucleus 6-He with the target nucleus 238-U . They managed to extract information which could make basic discrimination between the structures of the target nucleus (behaving as standard nucleus with density distribution described with canonical RMS radius r = r0 A 1/3 with r0 = 1.2 fm), and the ”core” of the halo nucleus, which surprisingly, does not follow the standard density distribution with the above RMS radius. This provides unambiguous and strong support for a Quantum Chromodyanamics based model structure, which shows as to how and why the halo structure arises. This model succeeds in identifyng all known halo nuclei and also makes clear-cut and unique predictions for new halo nuclei. It also provides a consistent and unified understanding of what is imlied for the emergence of new magic numbers in the study of exotic nuclei. It is triton clustering, as apparent from experimental data on neutron-rich nuclei, which guides us to this new model. It provides a new perspective, of how QCD leads to a consistent understanding of the nuclear phenomenon, both of the N ∼ Z nuclei, and of those which are far away from this limit.

Comments: 17 Pages.

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[v1] 2019-03-09 23:57:09

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