Towards limiting temperatures in nuclei: The behavior of collective motion

Journal Article · Mon May 23 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.3321· OSTI ID:7307750

Le Faou, J H; Suomijaervi, T; Blumenfeld, Y; Piattelli, P; Agodi, C; Alamanos, N; Alba, R; Auger, F; Bellia, G; Chomaz, P; Coniglione, R; Del Zoppo, A; Finocchiaro, P; Frascaria, N; Gaardhoje, J J; Garron, J P; Gillibert, A; Lamehi-Rachti, M; Liguori-Neto, R; Maiolino, C ; Migneco, E; Russo, G; Roynette, J C; Santonocito, D; Sapienza, P; Scarpaci, J A; Smerzi, A ^[1]

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1. Institut de Physique Nucleaire; Institut National de Physique Nucleaire et de Physique des Particules; Centre National de la Recherche Scientifique; 91406 Orsay (France) Istituto Nazionale di Fisica Nucleare-Laboratorio Nazionale del Sud; via A. Doria; Catania (Italy) Service de Physique Nucleaire; DAPNIA; Centre d'Etudes Nucleaires; Saclay; 91191 Gif-sur-Yvette (France) Grand Accelerateur National d'Ions Lourds BP 5027; 14021 Caen (France) The Niels Bohr Institute; University of Copenhagen; DK-2100 O (Denmark)

Gamma rays emitted from hot nuclei with mass around 115 and excitation energies between 350 and 500 MeV, formed in the [sup 36]Ar + [sup 90]Zr reaction at 27 MeV/nucleon have been measured. The [gamma]-ray yield from the decay of the giant dipole resonance in these nuclei remains constant over the excitation energy range studied. This quenching of the [gamma] multiplicity cannot be explained by a continuous increase with temperature of the width of the resonance. Better agreement with the data is obtained by assuming a cutoff of [gamma] emission from the resonance above an excitation energy of 250 MeV. The existing data do not show entrance channel effects.

• OSTI ID: 7307750
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:21; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARGON 36 REACTIONS
CHARGED-PARTICLE REACTIONS
COLLECTIVE EXCITATIONS
DIMENSIONS
DIPOLES
ELECTROMAGNETIC RADIATION
ENERGY
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
GAMMA RADIATION
GIANT RESONANCE
HEAVY ION REACTIONS
IONIZING RADIATIONS
MEV RANGE
MEV RANGE 100-1000
MULTIPLICITY
MULTIPOLES
NUCLEAR REACTIONS
NUCLEI
RADIATIONS
RESONANCE
TARGETS
TEMPERATURE DEPENDENCE
WIDTH
ZIRCONIUM 90 TARGET