Comparison of semiclassical transfer to continuum model with Ichimura-Austern-Vincent model in medium energy knockout reactions

Lei, Jin; Bonaccorso, A.

doi:10.1016/j.physletb.2020.136032

Cited by 17 publications

(19 citation statements)

References 49 publications

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“…Although transfer cross sections are not usually measured at high energies due to their low cross sections, it is still interesting to determine the magnitude of the non-local effects for this channel in this energy regime. Indeed, due to the similarities in the probes, one can expect that if the effects of non-locality are significant in the transfer channel, they would also be important in stripping, the main contributor to the knockout cross section [27]. The analysis for transfer is possible thanks to the recent generalization of the adiabatic distorted wave approximation (ADWA) formalism [28] including non-local interactions [29,30].…”

Section: Effects Of Non-locality For Reactions At High Energiesmentioning

confidence: 99%

“…Since the methods for transfer reactions have already been extended to include nonlocality explicitly, in the first part of this work we study transfer reactions at energies that are higher than what would normally be used for this type of reaction (> 100 MeV/nucleon). Because the stripping mechanism, corresponding to the non-elastic channels where the nucleon is absorbed by the target, is the largest contributor to knockout cross sections [27], if effects turn out to be large for transfer, then effects can also be expected to be large for knockout. Once that is established, we consider a couple of different paths to include non-locality explicitly in the eikonal formalism.…”

Section: Introductionmentioning

confidence: 99%

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Considering non-locality in the optical potentials within eikonal models

Hebborn,

Nunes

2021

Preprint

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Background: For its simplicity, the eikonal method is the tool of choice to analyze nuclear reactions at high energies (E > 100 MeV/nucleon), including knockout reactions. However, so far, the effective interactions used in this method are assumed to be fully local.Purpose: Given the recent studies on non-local optical potentials, in this work we assess whether non-locality in the optical potentials is expected to impact reactions at high energies and then explore different avenues for extending the eikonal method to include non-local interactions.Method: We compare angular distributions obtained for non-local interactions (using the exact R-matrix approach for elastic scattering and the adiabatic distorted wave approximation for transfer) with those obtained using their local-equivalent interactions.Results: Our results show that transfer observables are significantly impacted by non-locality in the high-energy regime.Because knockout reactions are dominated by stripping (transfer to inelastic channels), non-locality is expected to have a large effect on knockout observables too. Three approaches are explored for extending the eikonal method to non-local interactions, including an iterative method and a perturbation theory.Conclusions: None of the derived extensions of the eikonal model provide a good description of elastic scattering. This work suggests that non-locality removes the formal simplicity associated with the eikonal model.

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Section: Effects Of Non-locality For Reactions At High Energiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Considering non-locality in the optical potentials within eikonal models

Hebborn,

Nunes

2021

Preprint

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“…Other variants of these reactions models are found in Refs. [30][31][32][33][34][35][36][37][38][39][40][41][42][43]. The input of these calculations are the nucleon-nucleon cross sections, using the parametrization provided in Ref.…”

Section: Introductionmentioning

confidence: 99%

Nuclear Spectroscopy with Heavy Ion Nucleon Knockout and (p,2p) Reactions

Li,

Bertulani,

2022

Preprint

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Knockout reactions with heavy ion targets in inverse kinematics, as well as "quasi-free" (p,2p) and (p,pn) reactions are useful tools for nuclear spectroscopy. We report calculations on ab-initio many-body wavefunctions based on the no-core shell model to study the nucleon removal reactions in light nuclei, including beryllium, carbon, and oxygen isotopic chains, and explore the importance of using an ab-initio method. Our study helps clarifying how the extraction of spectroscopic factors from the experiments depend on the details of the many-body wavefunctions being probed. We show that recent advances with the ab-initio method can provide more insights on the spectroscopy information extracted from experiments.

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“…Thus the correct implementation of the model requires an energy dependent optical potential as stressed by IAV [29]. However an energy dependent potential while applied in the past to low energy reactions and/or small projectile-target combinations [30,36,37], had not been implemented until recently [41] in any of the QM model mentioned above in the case of heavy ion reactions at high energy (>50A.MeV). On the other hand the standard implementation of the STC method is with an energy dependent potential because it was introduced for heavy-ion reactions at medium to high incident energies where the energy spectra are quite broad [38,40].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand the standard implementation of the STC method is with an energy dependent potential because it was introduced for heavy-ion reactions at medium to high incident energies where the energy spectra are quite broad [38,40]. Recently results from the IAV and STC models have been compared [41] calculating neutron and proton breakup from 14 O and 16 C on a 9 Be target [42]. This is the first example of an application of the IAV model implemented with an energy dependent potential, for heavy ions at intermediate energies.…”

Section: Introductionmentioning

confidence: 99%

Models of breakup: a final state interaction problem. In memory of Mahir Hussein

bonaccorso,

Brink

2021

Preprint

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In this paper we discuss the evolution of breakup models from fully quantum mechanical, such as the Ichimura-Austern-Vincent model to semiclassical, to eikonal approximations following the insight on the mechanism first proposed by Hussein and McVoy (HM) for the presently called stripping term. In particular we concentrate on, and stress that, the correct implementation of a quantum mechanical model of breakup requires the use of energy dependent interactions and the energy averaging procedure is a key point to understand the difference among models. On the other hand using fixed energy potentials is one of the steps towards the high energy eikonal limit first proposed by HM. However the intermediate semiclassical transfer to the continuum model (STC) of Bonaccorso and Brink does use an energy dependent nucleon-target optical potential, while fixing the core-target interaction at the incident energy. The relationship between these methods is clarified.

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Comparison of semiclassical transfer to continuum model with Ichimura-Austern-Vincent model in medium energy knockout reactions

Cited by 17 publications

References 49 publications

Considering non-locality in the optical potentials within eikonal models

Considering non-locality in the optical potentials within eikonal models

Nuclear Spectroscopy with Heavy Ion Nucleon Knockout and (p,2p) Reactions

Models of breakup: a final state interaction problem. In memory of Mahir Hussein

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