Fusion cross sections in systems leading to [sup 170]Hf at near-barrier energies

Journal Article · Wed Mar 01 00:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.1336· OSTI ID:6585653

Gil, S; Hasenbalg, F; Testoni, J E; Abriola, D; Berisso, M C; di Tada, M; Etchegoyen, A; Fernandez Niello, J O; Pacheco, A J ^[1]; Charlop, A; Sonzogni, A A; Vandenbosch, R ^[2]

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1. Laboratorio TANDAR, Departamento de Fisica, Comision Nacional de Energia Atomica, Avenida del Libertador 8250, 1429 Buenos Aires (Argentina)
2. Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195 (United States)

In an effort to study the effect of the entrance channel mass asymmetry on the fusion process at near-barrier energies, we have measured the fusion cross section and its distribution according to the different evaporation residues for the [sup 28]Si+[sup 142]Ce, [sup 32]S+[sup 138]Ba, and [sup 48]Ti+[sup 122]Sn systems. All these systems lead to the same compound nucleus [sup 170]Hf. The measurements were performed using a delayed x-ray technique. For the last two systems we have also measured the fission cross sections in the same bombarding energy range. This experimental information can be used to restrict the free parameters of the statistical model used to account for the relative yield. A constrained and realistic statistical decay model is useful in reducing the uncertainties in the determination of the spin distribution from measurements of gamma multiplicities for these systems. The excitation function for the fusion cross section can be described using a schematic coupled channels calculation with realistic coupling strengths. Our results show no umambiguous effect that can be associated with the entrance channel mass asymmetry.

• OSTI ID: 6585653
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 51:3; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARIUM 138 TARGET
SULFUR 32 REACTIONS
CERIUM 142 TARGET
SILICON 28 REACTIONS
HAFNIUM 170
COMPOUND NUCLEI
HEAVY ION FUSION REACTIONS
CROSS SECTIONS
TIN 122 TARGET
TITANIUM 48 REACTIONS
ASYMMETRY
COUPLED CHANNEL THEORY
EVAPORATION
EXCITATION FUNCTIONS
FISSION
MASS
STATISTICAL MODELS
BETA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
FUNCTIONS
HAFNIUM ISOTOPES
HEAVY ION REACTIONS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR REACTIONS
NUCLEI
PHASE TRANSFORMATIONS
RADIOISOTOPES
TARGETS
663450* - Heavy-Ion-Induced Reactions & Scattering- (1992-)
663300 - Nuclear Reactions & Scattering
General- (1992-)