Elsevier

Nuclear Physics A

Volume 97, Issue 3, 8 May 1967, Pages 631-640
Nuclear Physics A

Origin of the fine structure in the giant resonance of 16O

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Abstract

The fine structure of nuclear continuum states is interpreted in the framework of the shell model as the result of coupling simple unbound configurations to more complicated many-particle-many-hole cluster-like quasi-bound states. Thus the splitting of the 22 MeV peak of the giant resonance is ascertained both theoretically and experimentally [(d, γ) experiment of M. Suffert] to be due to the existence of a two-particle-two-hole coherent quasi-bound state lying in the dip of the photoabsorption cross section. On the other hand, the 2p-2h mechanism cannot account for the 21.7 MeV structure, nor by itself for the structure above 24 MeV. Analysis of cluster transfer experiments [(4He, γ) of M. Suffert and M. Feldman, and (3He, γ) of N. Puttasswamy and D. Kohler] indicate the existence of a 4p-4h quasi-bound state in the vicinity of the 21.7 MeV structure, and of 3p-3h quasi-bound states above 24 MeV.

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Research supported in part by the National Science Foundation.

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