The $\gamma$-decay of the GDR built on superdeformed states in $^{143}$Eu

A search for the $\gamma$ decay of the Giant Dipole Resonance built on superdeformed (SD) nuclear configurations of $^{143}$Eu was made, using the reaction $^{110}$Pd($^{37}$Cl, $4n$)$^{143}$Eu at 165 MeV. Eight large $BaF_2$ scintillators and the NORDBALL array were used to measure high and low-energy $\gamma$-rays. The $\gamma$-spectrum gated by transitions populated by the SD states shows an excess yield at 7-10 MeV compared to the spectrum gated by transitions not populated by SD states. The comparison with statistical model predictions indicates that this excess most probably is due to $\gamma$-ray emission of the GDR built on superdeformed states