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Regular spacings of s-wave neutron resonances for the target nuclides 40Ca, 54Fe, 58Fe, 96Zr and 238U are discussed. An attempt is made to interpret these spacings with the phonon representation. The width and the maximum of the Gaussian-like distribution obtained for the nearest level spacings determine the phonon energy and lifetime respectively. There is good agreement between the lifetime of phonons and that of neutron resonances based on the average neutron width. The long lifetimes of phonons for 96Zr and 238U make it possible to distinguish subharmonic resonances. The finite lifetime of phonons and the observation of subharmonics characterise the neutron resonance spectrum as a spectrum of an anharmonic oscillator. These spectra are observable for neutron closed shells and neutron excess nuclei, which have a small neutron separation energy. Therefore, the study of neutron resonances provides experimental evidence that the nucleus has properties of a non-linear system.

Additional information

Authors: ROHR G, JRC Geel (BE)
Bibliographic Reference: Paper presented: International Conference on Nuclear Data for Science and Technology, Jülich (DE), May 13-17, 1991
Availability: Available from (1) as Paper EN 36144 ORA
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