title: Nature of the pygmy dipole resonance in 140Ce studied in (alpha, alpha' gamma) experiments.
abstract: 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 140Ce 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').
authors.affiliation: Institut für Kernphysik, TU Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt, Germany. savran@ikp.tu-darmstadt.de
authors.forename: D
authors.initials: D
authors.lastname: Savran
authors.forename: M
authors.initials: M
authors.lastname: Babilon
authors.forename: A M
authors.initials: AM
authors.lastname: van den Berg
authors.forename: M N
authors.initials: MN
authors.lastname: Harakeh
authors.forename: J
authors.initials: J
authors.lastname: Hasper
authors.forename: A
authors.initials: A
authors.lastname: Matic
authors.forename: H J
authors.initials: HJ
authors.lastname: Wörtche
authors.forename: A
authors.initials: A
authors.lastname: Zilges