Two causes of nonlocalities in nucleon-nucleus potentials and their effects in nucleon-nucleus scattering

Fraser, P. R.; Amos, K.; Karataglidis, S.; Canton, L.; Pisent, G.; Svenne, J. P.

doi:10.1140/epja/i2007-10524-1

Cited by 35 publications

(27 citation statements)

References 29 publications

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“…Many of these studies derive the nonlocal potential using some microscopic theory, then compare the potential obtained to commonly used phenomenological nonlocal potentials. Such was done in [54] where the multichannel algebraic scattering (MCAS) method [70] was used to obtain the nonlocal potential resulting from channel coupling. The resulting nonlocal potential was found to be very different from the simple Gaussian nonlocalities assumed in phenomenological potentials.…”

Section: Microscopic Optical Potentialsmentioning

confidence: 99%

Explicit inclusion of nonlocality in(d,p)transfer reactions

2016

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Background: Traditionally, nucleon-nucleus optical potentials are made local for convenience. In recent work we studied the effects of including nonlocal interactions explicitly in the final state for (d,p) reactions, within the distorted wave Born approximation.Purpose: Our goal in this work is to develop an improved formalism for nonlocal interactions that includes deuteron breakup and to use it to study the effects of including nonlocal interactions in transfer (d,p) reactions, in both the deuteron and the proton channel.Method: We extend the finite-range adiabatic distorted wave approximation to include nonlocal nucleon optical potentials. Results: We find that nonlocality in the deuteron scattering state reduces the amplitude of the wave function in the nuclear interior, and shifts the wave function outward. In many cases, this has the effect of increasing the transfer cross section at the first peak of the angular distributions. This increase was most significant for heavy targets and for reactions at high energies.Conclusions: Our systematic study shows that, if only local optical potentials are used in the analysis of experimental (d, p) transfer cross sections, the extracted spectroscopic factors may be incorrect by up to 40% due to the local approximation.

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Section: Microscopic Optical Potentialsmentioning

confidence: 99%

Explicit inclusion of nonlocality in(d,p)transfer reactions

2016

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“…Before describing some selected results obtained by the Padua group another recent publication should be mentioned, [88], where nonlocalities in nucleon-nucleus potentials are considered in greater detail.…”

Section: Weakly Bound Light Nuclei With the Multi Channel Algebraic Smentioning

confidence: 99%

Few-nucleon physics

Leidemann¹

2009

J. Phys.: Conf. Ser.

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Abstract. Recent progress in few-nucleon physics achieved by Italian research groups is described. Results for relativistic effects in elastic three-nucleon form factors (Rome group), hadronic and electromagnetic observables in three-and four-nucleon systems with special emphasis on three-nucleon force effects (Pisa and Trento groups), and spectra of nuclei with more than 4 nucleons (Padua group) are presented. IntroductionThe field of few-nucleon physics constitutes an essential part of nuclear physics. It consists of ab initio calculations of hadronic and electromagnetic observables with a given well-defined Hamiltonian of an A-nucleon system, where exact solutions of the quantum mechanical A-body system are requested for bound and/or scattering states. In particular one can consider boundstate spectra and observables from hadronic reactions like scattering lengths, phase shifts, total and differential cross sections. A polarization of beam, target, and/or final particles leads to many other hadronic polarization observables. In addition reactions with electroweak probes (photons, electrons, neutrinos) without and with polarization degrees of freedom give further information on the nuclear dynamics and electroweak structure of few-nucleon systems. For the latter one has to consider a further important aspect, namely the consistency of the electroweak currents with the nuclear Hamiltonian.Few-nucleon physics has many objectives: development of nuclear force models (nucleonnucleon (NN) and three-nucleon (3N) forces) and check whether even higher many-body forces are necessary, test of nuclear force models via two-and three-nucleon hadronic observables with possible feedback on force model, further test of nuclear dynamics in electromagnetic reactions with two-and three-nucleon systems; the study of the electroweak structure of few-nucleon systems; the investigation of the importance of relativistic effects; the extension of nuclear force models beyond pion threshold; the determination of neutron electroweak properties in twoand three-nucleon electroweak observables; the determination of observables with astrophysical relevance.Here follows a very brief summary on the state of the art for some selected aspects of fewnucleon physics. NN potential models have a long history (see e.g. [1] [5,6,7]. The potentials [2,3,4,5] all lead to a perfect or almost perfect description of various thousands of NN scattering data for energies up to pion threshold, while the chiral potential [6,7] is constructed more in the original spirit of effective field theory where open parameters are fitted to low-energy data only. The history of 3N forces started with

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“…Furthermore, optical potentials are known to be non-local due to the character of the underlying in-medium nucleon-nucleon interactions, the Pauli principle that results in exchange scattering amplitudes, and specific coupled-channel effects. These features have been described [7], and at low energies, the role of coupled-channels has been shown [8] to be more complex than the approximate treatment of nonlocality via the Perey effect [9].…”

Section: Introductionmentioning

confidence: 99%

“…The compound system, 10 Be, is also quite strongly bound with the α+ 6 He threshold lying at 7.413 MeV in the spectrum. Given that the α+α compound, 8 Be, is unbound, the two additional neutrons weakly bound in 6 He are attached in covalent bounding orbits in the cluster of that nucleus with an α to form 10 Be. The nucleus 6 He lies close to the neutron drip line.…”

Section: Introductionmentioning

confidence: 99%

A multi-channel model for an $ \alpha$ α plus 6He nucleus cluster

et al. 2017

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A multi-channel algebraic scattering (MCAS) method has been used to solve coupled sets of Lippmann-Schwinger equations for the α+ 6 He cluster system, so finding a model spectrum for 10 Be to more than 10 MeV excitation. Three states of 6 He are included and the resonance character of the two excited states taken into account in finding solutions. A model Hamiltonian has been found that gives very good agreement with the known bound states and with some low-lying resonances of 10 Be. More resonance states are predicted than have as yet been observed. The method also yields S-matrices which we have used to evaluate low-energy 6 He-α scattering cross sections. Reasonable reproduction of low-energy differential cross sections and of energy variation of cross sections measured at fixed scattering angles is found. PACS numbers: 21.60Ev, 21.60Gx, 24.10Eq, 24.30Gd,25.70Gh * Electronic address: amos@unimelb.edu.au

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Two causes of nonlocalities in nucleon-nucleus potentials and their effects in nucleon-nucleus scattering

Cited by 35 publications

References 29 publications

Explicit inclusion of nonlocality in(d,p)transfer reactions

Explicit inclusion of nonlocality in(d,p)transfer reactions

Few-nucleon physics

A multi-channel model for an $ \alpha$ α plus 6He nucleus cluster

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