Excitation energy and nuclear dissipation probed with evaporation-residue cross sections

Journal Article · Fri Apr 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.044611· OSTI ID:21499590

Ye, W ^[1]

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1. Department of Physics, Southeast University, Nanjing 210096, Jiangsu Province (China)

Using a Langevin equation coupled with a statistical decay model, we calculate the excess of evaporation-residue cross sections over its standard statistical-model value as a function of nuclear dissipation strength for {sup 200}Hg compound nuclei (CNs) under two distinct types of initial conditions for populated CNs: (i) high excitation energy but low angular momentum (produced via proton-induced spallation reactions at GeV energies and via peripheral heavy-ion collisions at relativistic energies) and (ii) high angular momentum but low excitation energy (produced through fusion mechanisms). We find that the conditions of case (ii) not only amplify the effect of dissipation on the evaporation residues, but also substantially increase the sensitivity of this excess to nuclear dissipation. These results suggest that, in experiments, to obtain accurate information of presaddle nuclear dissipation strength by measuring evaporation-residue cross sections, it is best to choose the heavy-ion-induced fusion reaction approach to yield excited compound nuclei.

• OSTI ID: 21499590
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevC.83.044611; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
COMPOUND NUCLEI
CROSS SECTIONS
EVAPORATION
EXCITATION
GEV RANGE
HEAVY ION REACTIONS
HEAVY IONS
LANGEVIN EQUATION
MERCURY 200
PROTONS
RELATIVISTIC RANGE
RESIDUES
SENSITIVITY
SPALLATION
STATISTICAL MODELS
BARYONS
CHARGED PARTICLES
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EVEN-EVEN NUCLEI
FERMIONS
HADRONS
HEAVY NUCLEI
IONS
ISOTOPES
MATHEMATICAL MODELS
MERCURY ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PHASE TRANSFORMATIONS
STABLE ISOTOPES