Coupled reaction channels effects in the elastic scattering of sup 32,36 S+ sup 58,64 Ni

Journal Article · Thu Mar 01 00:00:00 EST 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.1018· OSTI ID:6849126

Stefanini, A M; Tivelli, A; Montagnoli, G; Napoli, D R; Bonamini, D ^[1]; Beghini, S; Scarlassara, F; Soramel, F ^[2]; Signorini, C ^[3]; DeRosa, A; Inglima, G; Sandoli, M ^[4]; Cardella, G; Papa, M; Rizzo, F ^[5]

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1. Istituto Nazionale di Fisica Nucleare Laboratori Nazionali di Legnaro, I-35020 Legnaro, Padova, Italy (IT)
2. Dipartimento di Fisica Universita di Padova and Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy (IT)
3. Dipartimento di Fisica, Universita di Salerno Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy (IT)
4. Dipartimento di Fisica, Universita di Napoli Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy (IT)
5. Dipartimento di Fisica, Universita di Catania Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Catania, Italy (IT)

Elastic scattering angular distributions of {sup 32,36}S (beams)+{sup 58.64}Ni have been measured at several energies around the Coulomb barrier. An optical-model analysis of the data reveals remarkable energy dependences of the potentials at the strong absorption radii, in all cases. The largest effects are observed for {sup 32}S+{sup 64}Ni. This is due to the coupled reaction channels which also strongly influence the sub-barrier fusion cross sections. Coupled-channels calculations of elastic scattering and fusion have been performed, including the inelastic excitations of projectile and target; the need for considering additional (transfer) channels is made evident. We also have indications that sub-barrier fusion is not merely tunneling through a potential barrier, although energy dependent, as absorption into fusion takes place at larger internuclear distances. Older fusion and quasielastic transfer data are overviewed and compared with the reaction cross sections extracted from elastic scattering. Open questions still remain about the role of specific channels in determining the observed isotopic differences.

• OSTI ID: 6849126
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Vol. 41:3; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NICKEL 58 TARGET
SULFUR 32 REACTIONS
SULFUR 36 REACTIONS
NICKEL 64 TARGET
ELASTIC SCATTERING
ANGULAR DISTRIBUTION
COULOMB FIELD
COUPLED CHANNEL THEORY
CROSS SECTIONS
ENERGY DEPENDENCE
ENERGY LEVELS
HEAVY ION FUSION REACTIONS
INELASTIC SCATTERING
OPTICAL MODELS
PARITY
QUASI-ELASTIC SCATTERING
SPIN
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
DIRECT REACTIONS
DISTRIBUTION
ELECTRIC FIELDS
HEAVY ION REACTIONS
NUCLEAR REACTIONS
PARTICLE PROPERTIES
QUASI-FREE REACTIONS
SCATTERING
TARGETS
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