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Physical Review Letters 97 (2006) 242502
Evidence for a Three-Phonon Giant Resonance State in $^{40}$Ca Nuclei
M. Fallot1, J. A. Scarpaci1, N. Frascaria1, Y. Blumenfeld1, A. Chbihi2, Ph. Chomaz2, P. Désesquelles1, J. Frankland2, E. Khan1, J.L. Laville2, E. Plagnol1, E. C. Pollacco3, P. Roussel-Chomaz2, J. C. Roynette1, A. Shrivastava1, T. Zerguerras1
INDRA Collaboration(s)

Inelastic scattering of $^{40}$Ca on $^{40}$Ca at 50 MeV/A has been measured in coincidence with protons at the GANIL facility. The SPEG spectrometer was associated with 240 CsI(Tl) scintillators of the INDRA 4$\pi$ array, allowing for the measurement of complete decay events. The missing energy method was applied to these events. For events with excitation energy between 42 and 55 MeV, a direct decay branch by three protons towards the low energy states of $^{37}$Cl gives the first evidence for a 3-phonon state built with giant resonances.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
3 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
Physique/Physique Nucléaire Expérimentale