SHIFT OF NEUTRON RESONANCE LEVELS IN PERIODIC STRUCTUREJapan Atomic Energy Research Institute Tokai-mura, Ibaraki-ken 319-11, Japan A large part of neutron resonance levels for the nuclei of Er-168, Hf-177 and Hf-179 are found to be located among the periodic positions of a single sequence spanned over a wide range of energy. We can use these resonances as a reference and extract the same periodic components from the other nuclei. For each of the nuclei where the extractions are successfully made, we have measured the relative shifts of the periodic positions from those of the reference nucleus. For a limited mass range of nuclei, especially, around rotational nuclei, the relative shifts show a regular pattern, which suggests the correlated behavior of the occurrence of levels among these nuclei. KEYWORDS: deduced relative shifts, periods, neutron resonance levels, medium and heavy nuclei |