Open AccessMapping the demise of collective motion in nuclei at high excitation energy
Author(s) -
D. Santonocito,
Y. Blumenfeld,
C. Maiolino,
C. Agodi,
R. Alba,
G. Bellia,
R. Coniglione,
A. Del Zoppo,
Hongmei Fan,
E. Migneco,
P. Piattelli,
P. Sapienza,
L. Auditore,
G. Cardella,
E. De Filippo,
E. La Guidara,
C. Monrozeau,
M. Papa,
S. Pirrone,
F. Rizzo,
A. Trifirò,
M. Trimarchì,
H. X. Huang,
O. Wieland
Publication year - 2018
Publication title -
physics letters b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.093
H-Index - 283
eISSN - 1873-2445
pISSN - 0370-2693
DOI - 10.1016/j.physletb.2018.05.052
Subject(s) - excitation , dipole , physics , atomic physics , quenching (fluorescence) , range (aeronautics) , excitation function , energy (signal processing) , resonance (particle physics) , nuclear physics , nuclear reaction , materials science , optics , fluorescence , quantum mechanics , composite material
High energy gamma-rays from the 116Sn + 24Mg reaction at 23A MeV were measured using the MEDEA detector at LNS – INFN Catania. Combining this new data with previous measurements yields a detailed view of the quenching of the Giant Dipole Resonance as a function of excitation energy in nuclei of mass A in the range 120 ÷ 132 . The transition towards the disappearance of the dipole strength, which occurs around 230 MeV excitation energy, appears to be remarkably sharp. Current phenomenological models give qualitative explanations for the quenching but cannot reproduce its detailed features.
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