Temperatures and excitation energies of hot nuclei in the reactions of /sup 32/S+Ag and /sup 16/O+Ag at 30 MeV/nucleon

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.39.497· OSTI ID:6388680

Wada, R; Fabris, D; Hagel, K; Nebbia, G; Lou, Y; Gonin, M; Natowitz, J B; Billerey, R; Cheynis, B; Demeyer, A; others, and

For the reactions of 30 MeV/nucleon /sup 16/O and /sup 32/S with Ag, singles and coincidence measurements have been made for heavy residues, fragments (3less than or equal tozless than or equal to14), and light charged particles (zless than or equal to2). Mass-velocity correlations for the residues and fragment-residue coincidences indicate that increasing residue velocities do correspond to increasing excitation energy. Excitation energies as high as 90% of those which would result from complete fusion are reached. The spectra of light particles detected in coincidence with residue groups having different average velocities are analyzed with a moving source fit. When recoil effects are properly taken into account, excellent fits to the data are obtained. From the energy spectra and multiplicities of particles emitted from a fusion-like source the initial temperatures of the primary composite nuclei are determined. The results suggest that a plateau temperature near 6.5 MeV is reached above excitation energies of 3 MeV/nucleon. The temperatures are compared to those resulting from various model calculations.

• Research Organization: Cyclotron Institute, Texas AandM University, College Station, Texas 77843
• OSTI ID: 6388680
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA SPECTRA
ANGULAR DISTRIBUTION
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
EVAPORATION MODEL
FRAGMENTATION
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
IONIZATION CHAMBERS
MASS SPECTRA
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
METALS
MEV RANGE
MEV RANGE 100-1000
MULTIPLICITY
NUCLEAR MODELS
NUCLEAR REACTIONS
OXYGEN 16 REACTIONS
RADIATION DETECTORS
RECOILS
SILVER
SPECTRA
SULFUR 32 REACTIONS
TIME-OF-FLIGHT METHOD
TRANSITION ELEMENTS
TRITONS