Towards limiting temperatures in nuclei: The behavior of collective motion

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 e...

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Bibliographic Details
Published in:Physical review letters 1994-05, Vol.72 (21), p.3321-3324
Main Authors: Le Faou JH, Suomijärvi, 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, JJ, Garron, JP, Gillibert, A, Lamehi-Rachti, M, Liguori-Neto, R, Maiolino, C, Migneco, E, Russo, G, Roynette, JC, Santonocito, D, Sapienza, P, Scarpaci, JA, Smerzi, A
Format: Article
Language:English
Subjects:
663300 > Nuclear Reactions & Scattering, General-- (1992-)
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 Experiment
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR REACTIONS
NUCLEI
Physics
RADIATIONS
RESONANCE
TARGETS 663450 > Heavy-Ion-Induced Reactions & Scattering-- (1992-)
TEMPERATURE DEPENDENCE
WIDTH
ZIRCONIUM 90 TARGET
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Description
Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.72.3321