Accueil du site > Publications récentes > Mapping the demise of collective motion in nuclei at high excitation energy
D. Santonocito, Y. Blumenfeld et al.
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.
Voir en ligne : Phys. Lett. B 782, 427 (2018)
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