Large-angle elastic scattering of alpha particles by 39K, 40Ca, 42Ca, 44Ca and 50Ti

Gruhn, C.R.; Wall, N. S.

doi:10.1016/s0029-5582(66)80011-1

Cited by 62 publications

(30 citation statements)

References 18 publications

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“…The oscillation in Re S~ and Im S~ as a function of l are out of phase for low values of l and therefore interfere destructively and give a smooth in the reflection coefficient. The spike and the dip however in the shoulder of Re Sz are directly related to the GruhnWall [23] dip which has been found to be fully responsible for the backscattering peaking of the elastic scattering cross section.…”

Section: Vc(r)=z1z2e2/rc[(-}-(r/r~)2)o(rc-r)+rjro(r-r~)]mentioning

confidence: 86%

Semiclassical treatment of heavy ion elastic scattering

Morsy

Toepffer

1973

Z. Physik

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A generalized semiclassical treatment for the elastic scattering of heavy ions is developed in the presence of a complex optical potential. The scattering phase shift and its derivatives with respect to the impact parameter are calculated after extending the JWKBL approximation. The results are compared with experimental data for the elastic scattering of 1~O from medium and heavy target nuclei and relation between the present treatment and that of the optical model and Regge pole analysisis established

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Section: Vc(r)=z1z2e2/rc[(-}-(r/r~)2)o(rc-r)+rjro(r-r~)]mentioning

confidence: 86%

Semiclassical treatment of heavy ion elastic scattering

Morsy

Toepffer

1973

Z. Physik

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“…For values near the orbiting angular momentum (ℓ o ≈10), the two components interfere and a downward spike appears in the total profile, in complete agreement with the quantum result. This is the famous Grühn-Wall spike [41] introduced phenomenologically to explain ALAS for α particle scattering, and appears here as a strong interference between barrier and internal barrier amplitudes. Second, the B/I components are almost decoupled in the angular momentum space and therefore they will contribute in different angular ranges.…”

Section: Semiclassical Barrier and Internal Barrier Amplitudesmentioning

confidence: 90%

Refractive versus resonant diffraction scattering of loosely bound6Li nuclei

Cârstoiu

Trache

2012

Phys. Rev. C

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We present a complete analysis of elastic scattering 6 Li+ 16 O at 4 and 5 MeV/nucleon. Using either traditional Woods-Saxon or a range of semi-microscopic folding form-factors we find that the data require deep, highly transparent potentials. Physically relevant solutions are selected according to dispersion relation. The intermediate angle structures and the oscillatory increase of the cross section at large angles is interpreted either as a pre-rainbow oscillation resulting from the interference of the barrier and internal barrier far-side scattering subamplitudes, or, equally well, as a resonant diffraction arising from two Regge poles located in peripheral waves. Both semi-classical and Regge pole approaches allow a dynamical separation of the resonant component of the S-matrix.

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“…One of the earliest reactions in which some of these features were observed, was the elastic scattering of c~-particles from ~~ [2] and in this respect e-particles, which are usually regarded as belonging to the light-ion class, seem to share common ground with heavy ions. The phenomenon, as observed in eparticle elastic scattering, was subsequently desig-nated "anomalous large angle elastic scattering" (ALAS) [3].…”

Section: Introductionmentioning

confidence: 99%

Resonances in low energy elastic scattering of ?-particles from28Si

Lawrie

Cowley

Whittal

et al. 1986

Z. Physik A - Atomic Nuclei

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The elastic scattering of e-particles from 2sSi at incident energies between 5 and 12MeV (4.4 and 10.5MeV in the centre-of-mass system) was studied to ascertain whether quasimolecular states exist for the e+ 28Si system, as predicted in the literature in terms of a microscopic theory based on the generator coordinate method. Angular distributions were obtained for angles larger than 70 ~ in energy steps of 100keV. Analysis of the experimental data was performed by coherently adding specific resonances to an underlying optical model which describes the background portion of the direct elastic scattering amplitude. As is usual, it was furthermore assumed that the average compound elastic contribution adds incoherently to the total cross section. In spite of the presence of a resonance characterized by an angular momentum value of J =3 in the energy region, as required by theory, no evidence could be found for the existence of other resonances with the expected J-sequence. We conclude that our experiment and analysis do not support the predictions of the microscopic theory.

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Large-angle elastic scattering of alpha particles by 39K, 40Ca, 42Ca, 44Ca and 50Ti

Cited by 62 publications

References 18 publications

Semiclassical treatment of heavy ion elastic scattering

Semiclassical treatment of heavy ion elastic scattering

Refractive versus resonant diffraction scattering of loosely bound6Li nuclei

Resonances in low energy elastic scattering of ?-particles from28Si

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