Projectile excitation and structure effects in 6Li and 7Li scattering

Nishioka, H.; Tostevin, J. A.; Johnson, Ronald C.; Kubo, Kenn

doi:10.1016/0375-9474(84)90622-5

Cited by 132 publications

(65 citation statements)

References 46 publications

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“…The first published data to show strong coupling effects on the elastic scattering were for the 18 O and 12 C + 184 W systems at incident energies of 90 and 70 MeV, respectively, [2]. As can be seen in fig.…”

Section: Systems With Effects Due To Target Couplingmentioning

confidence: 94%

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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Section: Systems With Effects Due To Target Couplingmentioning

confidence: 94%

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

2014

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“…The cluster model is also successful in explaining the behavior of polarized projectiles. It is shown [4] that the coupling effects between the clusterdescribed excited states have a very important effect on the tensor analyzing powers, even at very low energy. Of particular interest is the work of Sakuragi et al [5], who use a detailed cluster description of 6Li, discretizing the continuum of break-up states in several bins for each relevant partial wave.…”

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confidence: 98%

Coupled channel effects in the scattering of 6,7Li BY 58Ni

1985

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Using a single-particle description of 6.7 Li and Woods-Saxon generated wave functions for 58 Ni matter density distribution, the diagonal and transition densities are calculated. Folding these densities with the M3Y effective interaction, the coupling and diagonal potentials are obtained. Coupled channel calculations for 6'TLi on 58 Ni at bombarding energies in a range from 12 to 74 MeV are performed. It is shown that the predictions of the coupled channel calculations are consistent with those of optical model calculations using folded potentials renormalized by a factor 0.6 in the entire range of energies.In recent years the scattering of light heavy ions such as 6'7Li and 9Be have received considerable interest. This is due to the failure of the double folding potential [1] obtained from an effective nucleon-nucleon interaction [2], which have to be renormalized by a factor around 0.6 in order to fit the elastic scattering data for these nuclei.This anomaly has been attributed to break-up effects which become important due to the low break-up threshold of these nuclei [3]. This idea has been confirmed by calculations describing 6Li and 7Li, respectively, as (a + a) and (a + t) systems. It is found that to reproduce the elastic scattering data of 6'7Li in terms of the optical potentials of the target with the fragments of the projectile, the break-up states must be considered. The cluster model is also successful in explaining the behavior of polarized projectiles. It is shown [4] that the coupling effects between the clusterdescribed excited states have a very important effect on the tensor analyzing powers, even at very low energy. Of particular interest is the work of Sakuragi et al. [5], who use a detailed cluster description of 6Li, discretizing the continuum of break-up states in several bins for each relevant partial wave. The diagonal and transition potentials are obtained from an effective nucleonnucleon interaction convoluted with the target density and the corresponding projectile diagonal and transition density. It is shown that the main contribution on the elastic scattering comes from the resonances which affect mainly the real potential.Recently we have developed a single-particle description of 7Li [6], assuming a (0s)4(0p) 3 configuration in a single-particle well for the relevant states of 7Li. The different negative parity states of this nucleus are obtained by diagonalizing a residual hamiltonian, and the diagonal and 0370-2693/85/$ 03.30

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“…As with the deuteron-and a-nucleus potentials, used as input to the coupled-channels calculations, the Cook potential was derived by fitting higherenergy elastic-scattering data. [31] and Ohnishi et al [32]. In the present work we have, for the first time, extended the application of this same three-body cluster model to the treatment of (d, Li) …”

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confidence: 74%

“…In terms of the complete set of states of d+a relative motion introduced above, the wave function gL+;x'(R, r) -we use outgoing-wave boundary conditions for clarity -can be expanded as As constructed, these intrinsic bin states 4&;(r) and the Li ground state form an orthonormal square-integrable set of states (14) with the result that the coupled-channels calculation can be carried out using conventional techniques. [31,32]. For generality we thus include the renormalization factors Nz and Nl for the real and imaginary parts; however, unless stated otherwise, these are set to unity.…”

mentioning

confidence: 99%

Effects ofLi6excitation inZn
Bowsher
¹
,
Clegg
²
,
Karwowski
³

et al. 1992
Phys. Rev. C
8
0
1
0
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Projectile excitation and structure effects in 6Li and 7Li scattering

Cited by 132 publications

References 46 publications

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

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

Coupled channel effects in the scattering of 6,7Li BY 58Ni

Effects ofLi6excitation inZn
Bowsher
¹
,
Clegg
²
,
Karwowski
³

et al. 1992
Phys. Rev. C
8
0
1
0
View full text Add to dashboard Cite

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Projectile excitation and structure effects in 6Li and 7Li scattering

Cited by 132 publications

References 46 publications

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

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

Coupled channel effects in the scattering of 6,7Li BY 58Ni

Effects ofLi6excitation inZnBowsher1, Clegg2, Karwowski3 et al. 1992Phys. Rev. C8010View full textAdd to dashboardCite

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Effects ofLi6excitation inZn
Bowsher
¹
,
Clegg
²
,
Karwowski
³

et al. 1992
Phys. Rev. C
8
0
1
0
View full text Add to dashboard Cite