Energy dependence of the p-4He optical model from intermediate-energy elastic-scattering experiments

Abstract The phenomenological strengths of the real part of the optical potential, obtained from elastic scattering data analyses within the optical model approach, present signiﬁcant energy-dependence. This behavior has been associated to the intrinsic energy-dependence of the eﬀective nucleon-nucleon interaction. However, in earlier works, we proposed that at least part of this dependence can arise from the eﬀect of couplings to inelastic states of the nuclei. In order to deepen this study, in this paper we present extensive data analyses for the elastic scattering and inelastic excitation of 111 states of 208Pb, for the 4He + 208Pb system in a wide energy range. With the purpose of comparison, the theoretical cross sections are obtained in diﬀerent approaches for the imaginary part of the potential, and within both contexts: optical model (distorted wave Born approximation) and coupled-channel calculations.

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Optical model calculations for the elastic scattering of intermediate energy alpha particles

Physical Review C ◽

10.1103/physrevc.49.1609 ◽

1994 ◽

Vol 49 (3) ◽

pp. 1609-1620 ◽

Cited By ~ 18

Author(s):

Anders Ingemarsson ◽

Agris Auce ◽

Roger Johansson

Keyword(s):

Elastic Scattering ◽

Optical Model ◽

Intermediate Energy ◽

Alpha Particles ◽

Model Calculations

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Anomaly in the Energy Dependence of the Angular Distributions for Deuterons Scattered from Mg24 in the Energy Range from 6 to 13 MeV

Zeitschrift für Naturforschung A ◽

10.1515/zna-1966-0714 ◽

1966 ◽

Vol 21 (7) ◽

pp. 958-963 ◽

Cited By ~ 11

Author(s):

C. Mayer-Böricke ◽

R. H. Siemssen

Keyword(s):

Elastic Scattering ◽

Energy Dependence ◽

Energy Region ◽

Optical Model ◽

Anomalous Behavior ◽

Angular Distributions ◽

Phase Rule ◽

Deuteron Scattering ◽

Yield Functions ◽

Optical Model Analysis

Angular distributions for elastic and 2+ inelastic deuteron scattering from Mg24 have been obtained at various energies in the range from 6 to 13 MeV. Yield functions have been measured in 50 keV steps at 90° and 150°. In the region from 10 to 13 MeV, the elastic angular distributions show an anomalous behavior : instead of moving in from 180°, a new maximum is created by the breakup of a broad maximum at about 100° into two maxima. The inelastic angular distributions do not show such an anomalous energy dependence. Therefore the Blair phase rule between the elastic and the 2+ inelastic angular distributions breaks down in the energy region of the anomaly in the elastic scattering, but it holds outside this energy region. In spite of fluctuations in the excitation functions, an optical-model analysis of the elastic angular distributions yields parameters which, with the exception of W, vary smoothly with energy.

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Optical model with tensorial potentials for the elastic scattering of intermediate energy deuterons

Physics Letters ◽

10.1016/0031-9163(63)90178-1 ◽

1963 ◽

Vol 3 (7) ◽

pp. 331-333 ◽

Cited By ~ 17

Author(s):

J. Raynal

Keyword(s):

Elastic Scattering ◽

Optical Model ◽

Intermediate Energy

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ANALYSIS OF REFRACTION EFFECTS IN NUCLEAR SCATTERING ON THE BASIS OF THE S-MATRIX APPROACH

Modern Physics Letters A ◽

10.1142/s0217732395002465 ◽

1995 ◽

Vol 10 (31) ◽

pp. 2305-2312 ◽

Cited By ~ 13

Author(s):

YU. A. BEREZHNOY ◽

V.V. PILIPENKO

Keyword(s):

Experimental Data ◽

Elastic Scattering ◽

Light Nucleus ◽

Optical Model ◽

Scattering Amplitude ◽

Intermediate Energy ◽

Matrix Approach ◽

Nuclear Scattering ◽

Atomic Nuclei ◽

S Matrix

A new S-matrix model is proposed to describe refraction effects in the intermediate energy light nucleus elastic scattering on atomic nuclei. An analysis of experimental data on scattering of 4 He , 6 Li and 16 O nuclei by different target nuclei is made on the basis of this model and the near-far decomposition of the scattering amplitude. Comparison of our results with those obtained by the optical model is discussed.

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A note on the relations between elastic and inelastic interactions and increasing ratio σel(s)/σtot(s) at the LHC

Modern Physics Letters A ◽

10.1142/s0217732319502596 ◽

2019 ◽

Vol 34 (32) ◽

pp. 1950259 ◽

Cited By ~ 5

Author(s):

S. M. Troshin ◽

N. E. Tyurin

Keyword(s):

Elastic Scattering ◽

Energy Dependence ◽

Impact Parameter ◽

Cross Sections ◽

Parameter Dependence ◽

Slope Parameter ◽

Short Notice ◽

Inelastic Interactions ◽

The Impact ◽

Mode A

We comment briefly on relations between the elastic and inelastic cross-sections valid for the shadow and reflective modes of the elastic scattering. Those are based on the unitarity arguments. It is shown that the redistribution of the probabilities of the elastic and inelastic interactions (the form of the inelastic overlap function becomes peripheral) under the reflective scattering mode can lead to increasing ratio of [Formula: see text] at the LHC energies. In the shadow scattering mode, the mechanism of this increase is a different one, since the impact parameter dependence of the inelastic interactions probability is central in this mode. A short notice is also given on the slope parameter and the leading contributions to its energy dependence in both modes.

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