Study of the 154Gd(n, γ)155Gd reaction in isolated resonances

Spectra of gamma-rays following the capture of neutrons in 154Cd nuclei at isolated resonances were measured on the IBR-30 reactor by the time-of-flight method. New information has been obtained about spin and parity for a number of levels of 155Gd nucleus. Statistically significant correlation between reduced neutron widths and partial radiation widths of resonances for transitions on vibrational levels of 155Gd nucleus has been observed. This correlation is explained in the framework of Soloviev's quasiparticle-phonon model. The evaluation of mean intensities of correlated and noncorrelated transitions is carried out and conclusions about possible character of fragmentation of giant dipole electrical resonance are drawn