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Excitation of giant resonances in $^(20)$Ne + $^(90)$Zr and $^(208)$Pb inelastic scattering at 40 MeV/u
Suomijärvi T., Beaumel D., Blumenfeld Y., Chomaz P., Frascaria N. et al
Nuclear Physics A 491 (1989) 314-336 - http://hal.in2p3.fr/in2p3-00408218
Physique/Physique Nucléaire Expérimentale
Excitation of giant resonances in $^{20}$Ne + $^{90}$Zr and $^{208}$Pb inelastic scattering at 40 MeV/u
T. Suomijärvi1, D. Beaumel1, Y. Blumenfeld1, Ph. Chomaz1, N. Frascaria1, J. P. Garron1, J. C. Jacmart1, J. C. Roynette1, J. Barrette2, B. Berthier2, B. Fernandez2, J. Gastebois2, P. Roussel-Chomaz2, W. Mittig3, L. Kraus4, I. Linck4
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
2 :  SPhN - Service de Physique Nucléaire
CEA : DSM/IRFU
France
3 :  GANIL - Grand Accélérateur National d'Ions Lourds
http://www.ganil-spiral2.eu
CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
France
4 :  DRS-IPHC - Département Recherches Subatomiques
CNRS : UMR7178 – IN2P3 – Université de Strasbourg
23 rue du Loess - BP28 67037 Strasbourg cedex 2
France
The giant resonance region in the inelastic spectra from the reactions 20Ne + 90Zr and 20Ne + 208Pb at 40 MeV/nucleon has been studied with good energy and angular resolutions. The strength distributions of the different multipolarities contributing to the cross section were obtained without making any hypothesis on the excitation energies and shapes of the resonances. In the case of 208Pb the GDR strength was found to be strongly shifted towards lower excitation energies which can be explained by the exponentially decreasing Coulomb excitation probability. Furthermore, indications for a high multipolarity component in the resonance structure were found in both reactions.

Articles dans des revues avec comité de lecture
1989
Nuclear Physics A (Nucl. Phys. A)
Publisher Elsevier
ISSN 0375-9474 
491
314-336

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