 |
 |
 |
|
|
|
| HAL : in2p3-00421874, version 1 |
| DOI : 10.1103/PhysRevC.80.034302 |
| Fiche détaillée |  Récupérer au format |
|
|
| Physical Review C 80 (2009) 0304302 |
|
|
|
|
| Splitting of the pygmy dipole resonance in 138Ba and 140Ce observed in the (α,α γ ) reaction |
|
|
| J. Endres1D. Savran2, 3A.M. Van den Berg3P. Dendooven3M. Fritzsche2M.N. Harakeh3, 4J. Hasper1H.J. Wörtche3A. Zilges1 |
|
|
| (2009) |
|
|
|
| The N = 82 nuclei 140Ce and 138Ba have been investigated by means of the (α,α γ ) coincidence method to study the pygmy dipole resonance (PDR). The experiments have been performed at the AGOR cyclotron at KVI, Groningen, at a primary beam energy of Eα = 136 MeV. The Big-Bite Spectrometer and seven large-volume high-purity germanium detectors were used in coincidence to perform a simultaneous spectroscopy of the scattered α particles and the γ decay. The comparison with results of nuclear resonance fluorescence experiments reveals a splitting of the PDR into two components. Up to about 6 MeV the same states that could be observed in (γ,γ ) are also excited in α-scattering experiments, whereas the higher-lying states are missing in the (α,α γ ) reaction. This indicates a structural splitting of the PDR into two modes with different underlying structure. |
|
|
|
|
|
|
|
|
|
|
|
| 1 : | Institut für Kernphysik |
|
|
| 2 : | Institut für Kernphysik |
|
|
| 3 : | KVI - Kernfysisch Versneller Instituut |
|
|
| 4 : | GANIL - Grand Accélérateur National d'Ions Lourds |
|
|
|
|
|
|
|
|
|
| Thème(s) | : | Physique/Physique Nucléaire Expérimentale |
| in2p3-00421874, version 1 | |
| http://hal.in2p3.fr/in2p3-00421874 | |
| oai:hal.in2p3.fr:in2p3-00421874 | |
| Contributeur : Michel Lion | |
| Déposé pour le compte de : | |
| Soumis le : Lundi 5 Octobre 2009, 09:43:26 | |
| Dernière modification le : Lundi 5 Octobre 2009, 13:32:13 | |
