The giant dipole resonance (GDR) from the decay of excited Er-156 nuclei populated in the reaction Ni-64 + Zr-92 at 241 MeV has been studied by using the GASP spectrometer. High-energy gamma-rays spectra have been obtained in coincidence with the 80 elements of the GASP inner ball and with discrete transitions in the residual nuclei Er-155,Er-154. GDR parameters extracted from the high-energy gamma-rays spectra in coincidence with low-energy gamma-ray fold k>10 are in good agreement with systematics as well as with predictions from adiabatic calculations. No signature for entrance channel effects in the decay of Er-156 was therefore observed from this lineshape analysis of the high-energy gamma-rays spectra in contrast with the case of the Yb-164 nucleus.
Giant dipole resonance studied with GASP / Cinausero, M.; Bazzacco, D.; Bortignon, P. F.; De Angelis, G.; Fabris, D.; Fiore, E. M.; Fiore, L.; Fioretto, E.; Fornal, B.; Gelli, N.; Lops, M.; Lucarelli, Franco; Lunardi, S.; Nebbia, G.; Paticchio, V.; Prete, G.; Rossi Alvarez, C.; Viesti, G.. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - STAMPA. - 599:(1996), pp. 111-116.
Giant dipole resonance studied with GASP
LUCARELLI, FRANCO;
1996
Abstract
The giant dipole resonance (GDR) from the decay of excited Er-156 nuclei populated in the reaction Ni-64 + Zr-92 at 241 MeV has been studied by using the GASP spectrometer. High-energy gamma-rays spectra have been obtained in coincidence with the 80 elements of the GASP inner ball and with discrete transitions in the residual nuclei Er-155,Er-154. GDR parameters extracted from the high-energy gamma-rays spectra in coincidence with low-energy gamma-ray fold k>10 are in good agreement with systematics as well as with predictions from adiabatic calculations. No signature for entrance channel effects in the decay of Er-156 was therefore observed from this lineshape analysis of the high-energy gamma-rays spectra in contrast with the case of the Yb-164 nucleus.
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