PT Journal
AU Krzysiek, Mea
   Gadea, A
   Huyuk, T
   Barrientos, D
TI Study of the soft dipole modes in Ce-140 via inelastic scattering of O-17
SO Physica Scripta
JI Phys. Scr.
PY 2014
BP 054016
EP 6pp
VL 89
IS 5
DI 10.1088/0031-8949/89/5/054016
LA English
DE pygmy dipole resonances; inelastic scattering; AGATA detector; gamma spectroscopy
AB The main aim of this study was a deeper understanding of the nuclear structure properties of the soft dipole modes in Ce-140, excited via inelastic scattering of weakly bound O-17 projectiles. An important aim was to investigate the 'splitting' of the PDR into two parts: a low-energy isoscalar component dominated by neutron-skin oscillations and a higher-energy component lying on the tail of the giant dipole resonance of a rather isovector character. This was already observed for this nucleus, investigated in (alpha, alpha') and (gamma,gamma') experiments. The experiment was performed at Laboratori Nazionali di Legnaro, Italy. Inelastic scattering of O-17 ion beam at 20 MeV A(-1) was used to excite the resonance modes in the Ce-140 target. Gamma-rays were registered by five triple clusters of AGATA-Demonstrator and nine large volume scintillators (LaBr3). The scattered O-17 ions were identified by two Delta E – E Si telescopes of the TRACE array mounted inside the scattering chamber. The telescopes consisted of two segmented Si-pad detectors, each of 60 pixels. Very preliminary data have shown a strong domination of the E1 transitions in the 'pygmy' region with a character more similar to the one obtained in alpha scattering experiment.
ER