A relativistic model for quasifree negative-pion photoproduction on nuclei

Johansson, J.I.; Sherif, H.

doi:10.1016/0375-9474(94)90373-5

Cited by 19 publications

(25 citation statements)

References 11 publications

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“…Relativistic analyses of the photonuclear reactions (γ, p) and (γ, π − p) are discussed in [Lo92,He94,Jo94]. Other phenomena such as (σωγ) mixing, (ρω) mixing, charge-symmetry breaking, and the production of (e + e − ) pairs to probe the quark-gluon plasma are discussed in [Kr92,Li95a,Li95b].…”

Section: Recent Developments In Electromagnetic Interactionsmentioning

confidence: 99%

Recent Progress in Quantum Hadrodynamics

Serot

Walecka

1997

Int. J. Mod. Phys. E

992

1,511

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Quantum hadrodynamics (QHD) is a framework for describing the nuclear many-body problem as a relativistic system of baryons and mesons. Motivation is given for the utility of such an approach and for the importance of basing it on a local, Lorentz-invariant lagrangian density. Calculations of nuclear matter and finite nuclei in both renormalizable and nonrenormalizable, effective QHD models are discussed. Connections are made between the effective and renormalizable models, as well as between relativistic mean-field theory and more sophisticated treatments. Recent work in QHD involving nuclear structure, electroweak interactions in nuclei, relativistic transport theory, nuclear matter under extreme conditions, and the evaluation of loop diagrams is reviewed.

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Section: Recent Developments In Electromagnetic Interactionsmentioning

confidence: 99%

Recent Progress in Quantum Hadrodynamics

Serot

Walecka

1997

Int. J. Mod. Phys. E

992

1,511

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“…As is known, the quasifree pion photoproduction model satisfactorily describes the reaction A(γ, πN )B at sufficiently high momenta, transferred to the nucleon in the process γN → N ′ π, and the small momenta of the residual nucleus, where the contribution of the nucleon configurations dominates [24][25][26]. The independent particle model reproduces well the manifestations in the reaction of the shell structure of the nucleus.…”

Section: Discussionmentioning

confidence: 90%

Isobar configurations: ΔN correlations versus the independent particle model

Glavanakov

Табаченко

2015

Nuclear Physics A

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We present a comparative analysis of two models for the A(γ, πN )B reaction, which take into account the isobar configurations in the ground state of the nuclei: the ∆N correlation model and the quasifree pion photoproduction model. The considered models differ in their descriptions of the nucleus states. The ∆N correlation model takes into account the dynamic correlations of the nucleon and isobar formed in the virtual transition N N → ∆N , and in the quasifree pion photoproduction model, isobars and nucleons in the nucleus are considered as independent constituents. The predictions of the models are considered for two reactionsIt is shown, that the two models predict the differential cross section significantly differing both in absolute values, and in the shape of the angular dependence. We compare the results of the ∆N correlation model for the (γ, πN ) and (γ, πN N ) reactions with the 16 O(γ, π − p) reaction data measured at BNL. Our results give support to the ∆N correlation model.

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“…[6,7]. A similar formula for the local approximation has been given in [13]. This approximation is widely used in DWIA calculations, in a nonrelativistic framework its validity has been studied in the photoproduction of charged pions in [14,15].…”

Section: Photoproduction On the Nucleusmentioning

confidence: 99%

Coherent photoproduction of eta-mesons on spin-zero nuclei in a relativistic, non-local model

1998

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The coherent photoproduction of η-mesons on spin-zero nuclei is studied in a relativistic, non-local model, which we have previously applied to the coherent photoproduction of pions. We find that different off-shell extrapolations of the elementary production operator lead to large effects in the cross section. We also show that the almost complete suppression of the N (1535) seen in earlier studies on this reaction is a result of the local or factorization approximation used in these works. Non-local effects can lead to a considerable contribution from this resonance. The relative size of the N (1535) contribution depends on the structure of the nucleus under consideration. We give an estimate for the contribution of the N (1520) resonance and discuss the effect of an η-nucleus optical potential.

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A relativistic model for quasifree negative-pion photoproduction on nuclei

Cited by 19 publications

References 11 publications

Recent Progress in Quantum Hadrodynamics

Recent Progress in Quantum Hadrodynamics

Isobar configurations: ΔN correlations versus the independent particle model

Coherent photoproduction of eta-mesons on spin-zero nuclei in a relativistic, non-local model

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