Effect of Inelastic Excitation on Elastic Scattering of Heavy Ions

Thorn, C.; LeVine, M. J.; Kolata, J. J.; Flaum, C.; Bond, Peter; Sens, J.C.

doi:10.1103/physrevlett.38.384

Cited by 74 publications

(31 citation statements)

References 4 publications

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“…The observed depletion of the elastic scattering cross section in the 18 O + 184 W system is due to strong coupling, in this case strong quadrupole Coulomb coupling to the first 2 + excited state of 184 W [2]. Similar effects have also been observed due to strong quadrupole Coulomb coupling in the projectile in the 20 Ne + 208 Pb system [3].…”

Section: (B) For 90 Mevsupporting

confidence: 58%

“…18 O incident on a 184 W target [2]. The observed depletion of the elastic scattering cross section in the 18 O + 184 W system is due to strong coupling, in this case strong quadrupole Coulomb coupling to the first 2 + excited state of 184 W [2].…”

Section: (B) For 90 Mevmentioning

confidence: 99%

“…As Thorn et al [2] were careful to point out, previous measurements of the "elastic scattering" of heavy ions from heavy deformed targets obtained the usual Fresnel scattering angular distributions because they could not resolve inelastic scattering to the ground state rotational bands. Thorn et al also showed, by explicit coupled channels calculations, that the elastic scattering data can be well described by coupling to the 111 keV 2 + 1 state of 184 W, the effect on the elastic scattering being almost entirely due to the Coulomb coupling (it should be noted that these elastic scattering data cannot be described by conventional optical model potentials).…”

Section: Systems With Effects Due To Target Couplingmentioning

confidence: 99%

“…The circles represent the data of ref. [2] while the solid curve denotes the result of a coupled channels calculation including Coulomb and nuclear coupling to the first 2 + excited state of 184 W. The dashed curve denotes the result of a no coupling optical model calculation using the same optical potential as in the coupled channels calculation.…”

Section: (B) For 90 Mevmentioning

confidence: 99%

“…The calculations use the same optical potential and coupling parameters as those of ref. [2] since in this figure we are investigating the qualitative evolution of the shape of the angular distribution as a function of bombarding energy rather than attempting to make quantitatively accurate predictions of the elastic scattering at a particular energy.…”

Section: General Considerationsmentioning

confidence: 99%

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Strong coupling effects in near-barrier heavy-ion elastic scattering

2014

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Abstract. Accurate elastic scattering angular distribution data measured at bombarding energies just above the Coulomb barrier have shapes that can markedly differ from or be the same as the expected classical Fresnel scattering pattern depending on the structure of the projectile, the target or both. Examples are given such as 18 O + 184 W and 16 O + 148,152 Sm, where the expected rise above Rutherford scattering due to Coulomb-nuclear interference is damped by coupling to the target excited states, and the extreme case of 11 Li scattering, where coupling to the 9 Li + n + n continuum leads to an elastic scattering shape that cannot be reproduced by any standard optical model parameter set. An early indication that the projectile structure can modify the elastic scattering angular distribution was the large vector analyzing powers observed in polarised 6 Li scattering. The recent availability of high-quality 6 He, 11 Li and 11 Be data provides further examples of the influence that coupling effects can have on elastic scattering. Conditions for strong projectile-target coupling effects are presented with special emphasis on the importance of the beam-target charge combination being large enough to bring about the strong coupling effects. Several measurements are proposed that can lead to further understanding of strong coupling effects by both inelastic excitation and nucleon transfer on near-barrier elastic scattering. A final note on the anomalous nature of 8 B elastic scattering is presented as it possesses a more or less normal Fresnel scattering shape whereas one would a priori not expect this due to the very low breakup threshold of 8 B. The special nature of 11 Li is presented as it is predicted that no matter how far above the Coulomb barrier the elastic scattering is measured, its shape will not appear as Fresnel like whereas the elastic scattering of all other loosely bound nuclei studied to date should eventually do so as the incident energy is increased, making both 8 B and 11 Li truly "exotic".

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