Аннотация
A concentration of electric-dipole excitations below the particle
threshold, which is frequently denoted as the pygmy dipole resonance,
has been studied in the semimagic nucleus Ce-140 in (alpha,
alpha(')gamma) experiments at E-alpha=136 MeV. The technique of
alpha-gamma coincidence experiments allows the separation of E1
excitations from states of other multipolarities in the same energy
region and provides an excellent energy resolution to allow a detailed
analysis for each state. The experimental results show that the PDR
splits into two parts with different nuclear structure: one part which
is excited in (alpha, alpha(')gamma) as well as (gamma, gamma('))
experiments and one part which is excited only in (gamma, gamma(')).
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