Probing fusion barrier distributions with quasi-elastic scattering

Timmers, H.; Leigh, J.R.; Dasgupta, M.; Hinde, David; Lemmon, R. C.; Mein, J. C.; Morton, Clyde; Newton, J.O.; Rowley, N.

doi:10.1016/0375-9474(94)00521-n

Cited by 193 publications

(252 citation statements)

References 18 publications

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“…4 to Fig. 6 [4,5,34,38,39,40] are also presented for comparison. The solid circles and squares denote the measured fusion cross sections σ fus and large-angle quasi-elastic scattering cross sections, respectively.…”

Section: B Description Of Large-angle Quasi-elastic Scatteringmentioning

confidence: 99%

“…In addition, it has been shown that the fusion barrier distribution generated by the coupling of the relative motion of the nuclei to internal degrees of freedom can be extracted from precisely measured fusion excitation functions [3,4]. The similarity of the barrier distribution can be extracted from large-angle quasi-elastic scattering excitation functions [5] which can be more easily measured than the fusion excitation functions [10]. Therefore, it is expected that both the fusion and quasielastic scattering cross sections of a heavy-ion reaction at energies around the Coulomb barrier can be unifiedly described by the same nucleus-nucleus potential.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-elastic scattering and fusion with a modified Woods-Saxon potential

Wang

Scheid

2008

Phys. Rev. C

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The elastic and large-angle quasi-elastic scattering reactions were studied with the same nucleusnucleus potential proposed for describing fusion reactions. The elastic scattering angle distributions of some reactions are reasonably well reproduced by the proposed Woods-Saxon potential with fixed parameters at energies much higher than the Coulomb barrier. With an empirical barrier distribution based on the modified Woods-Saxon potential and taking into account the influence of nucleons transfer, the calculated quasi-elastic scattering cross sections of a series of reactions are in good agreement with the experimental data.

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Section: B Description Of Large-angle Quasi-elastic Scatteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasi-elastic scattering and fusion with a modified Woods-Saxon potential

Wang

Scheid

2008

Phys. Rev. C

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“…To some extent, the effect of angular momentum can be corrected by shifting the energy by an amount equal to the centrifugal potential. Estimating the centrifugal potential at the Coulomb turning point r c , the effective energy may be expressed as [8] …”

Section: Scaling Property Of the Quasi-elastic Test Functionmentioning

confidence: 99%

“…At these backward angles, it is known that the single-barrier elastic cross section falls off smoothly from a value close to that for Rutherford scattering at low energies to very small values at energies high above the barrier. Timmers et al therefore proposed to use the first derivative of the ratio of the quasi-elastic cross section σ qel to the Rutherford cross section σ R with respect to energy, −d(dσ qel /dσ R )/dE, as an alternative representation of the barrier distribution [8]. The experimental data of Timmers et al have revealed [8] that the quasi-elastic barrier distribution is indeed similar to that for fusion, although the former may be somewhat smeared and thus less sensitive to nuclear structure effects.…”

Section: Introductionmentioning

confidence: 99%

Large-angle scattering and quasielastic barrier distributions

2004

Self Cite

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We study in detail the barrier distributions extracted from large-angle quasi-elastic scattering of heavy ions at energies near the Coulomb barrier. Using a closed-form expression for scattering from a single barrier, we compare the quasi-elastic barrier distribution with the corresponding test function for fusion. We examine the isocentrifugal approximation in coupled-channels calculations of quasi-elastic scattering and find that for backward angles, it works well, justifying the concept of a barrier distribution for scattering processes. This method offers an interesting tool for investigating unstable nuclei. We illustrate this for the 32 Mg + 208 Pb reaction, where the quadrupole collectivity of the neutron-rich 32 Mg remains to be clarified experimentally.

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“…But, the transformation of fusion cross section to BD has an advantage of showing this effect over the entire range of energy. It has been suggested that channel couplings also affect the scattering process and the nuclear structure information can also be obtained from quasi-elastic (QE) scattering cross sections at large backward angles [3] and the corresponding BD [4]. Indeed this even allows the study of very heavy systems leading to the creation of super-heavy compound nuclei [5][6] where fission and quasi-fission dominate, and the "fusion" barrier distribution becomes meaningless.…”

Section: Introductionmentioning

confidence: 99%