Consistent description of hindrance in sub-barrier fusion of {sup 48}Ca with {sup 36}S, {sup 48}Ca, and {sup 96}Zr

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.054622· OSTI ID:21502493

Misicu, Serban; Carstoiu, Florin ^[1]

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1. Department for Theoretical Physics, National Institute for Physics and Nuclear Engineering-Horia Hulubei, P.O. Box MG6, Bucharest-Magurele (Romania)

Recent fusion reaction data for the systems {sup 36}S+{sup 48}Ca, {sup 48}Ca+{sup 48}Ca, and {sup 96}Zr+{sup 48}Ca are analyzed within the coupled-channel formalism. The heavy-ion entrance channel potential is calculated employing an improved double-folding prescription. The nonlocal kernel arising from the knock-on exchange component of the effective N-N interaction is localized within the lowest order of the Perey-Saxon approach, including full recoil. The single-particle densities entering the folding integrals are prescribed according to the density matrix expansion method. The investigation is more elaborated because each case is tested with four different types of N-N effective forces: The two standard parametrizations of the density-independent M3Y force (Reid and Paris) and two parametrizations of the density-dependent Gogny force (D1S and D1N). A consistent description of all three reactions is achieved by keeping fixed the nuclear structure input for {sup 48}Ca. The inclusion of 2{sup +} and 3{sup -} phonon states in the coupled-channel calculation, within an energy excitation window identical for all three reactions explains better the hindrance in extreme sub-barrier fusion cross sections. The interactions providing the best fit to the data are not pointing to a possible maximum in the astrophysical S factor, thereby confirming the conclusion reached by the Legnaro group for these cases.

• OSTI ID: 21502493
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevC.83.054622; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTROPHYSICS
CALCIUM 48 REACTIONS
CALCIUM 48 TARGET
COMPUTERIZED SIMULATION
COUPLED CHANNEL THEORY
CROSS SECTIONS
DENSITY
DENSITY MATRIX
EXCITATION
EXPANSION
HEAVY IONS
INCLUSIONS
INTERACTIONS
KNOCK-ON
NUCLEAR STRUCTURE
RECOILS
SULFUR 36 TARGET
ZIRCONIUM 96 TARGET
CHARGED PARTICLES
ENERGY-LEVEL TRANSITIONS
HEAVY ION REACTIONS
IONS
MATRICES
NUCLEAR REACTIONS
PHYSICAL PROPERTIES
PHYSICS
SIMULATION
TARGETS