Spectral statistics and the fine structure of the electric pygmy dipole resonance in N=82 nuclei

• We study the statistical properties of the electric pygmy dipole resonance in four different isotones with neutron number N = 82. These nuclei are Ba-138(56), Ce-140(58), Nd-142(60), (144)(62)sm. The data set comprises levels with spin and parity J(pi) = 1(-) and their ground state B(E1) transition strengths. The statistics are found to be "mixed", i.e., in between the predictions of random matrix theory for correlated and uncorrelated spectra. Moreover, we calculate spectra and transition strengths in the quasiparticle phonon model (QPM). We compare experimental and theoretical findings. The incompleteness of the data sets and its impact on the results is discussed. A consistent picture emerges which yields an improved understanding of the statistical properties of the pygmy resonance. (

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

pygmy dipole resonance strength distributions

Sm-144

Nd-142

Ce-140

nuclear structure Ba-138

analyzed electric

level density

deduced

statistical properties

quasiparticle phonon model calculations

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)