High energy gamma-rays from the 116Sn+24Mg reaction at 23AMeV 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 Ain the range 120 ÷132. The transition towards the disappearance of the dipole strength, which occurs around 230MeV excitation energy, appears to be remarkably sharp. Current phenomenological models give qualitative explanations for the quenching but cannot reproduce its detailed features.

Mapping the demise of collective motion in nuclei at high excitation energy

Auditore, L.
Investigation
;
Trifiró, A.
Investigation
;
Trimarchi, M.
Investigation
;
2018-01-01

Abstract

High energy gamma-rays from the 116Sn+24Mg reaction at 23AMeV 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 Ain the range 120 ÷132. The transition towards the disappearance of the dipole strength, which occurs around 230MeV excitation energy, appears to be remarkably sharp. Current phenomenological models give qualitative explanations for the quenching but cannot reproduce its detailed features.
2018
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3128544
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