Fermion propagators in space-time

Bárbaro, M. B.; Berardo, D.; Cenni, R.; Donnelly, T. W.; Molinari, A.

doi:10.1103/physrevc.80.064320

Cited by 3 publications

(11 citation statements)

References 15 publications

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“…Such analyses have been carried out for few-body systems, complex nuclei, and nuclear matter and have focused mainly on the existence of high-momentum components of the nucleon momentum distribution due to NN correlation effects [2][3][4][5][6][7]. Since it is impossible within the MFA to describe simultaneously the density and momentum distributions in nuclei [4,[7][8][9][10][11][12], a consistent analysis of the role of the NN correlations is required using theoretical methods that go beyond the MFA to obtain a successful description of the relevant experiments. The present study uses the results found from studies of y scaling [1][2][3][13][14][15] and superscaling (based on ψ-scaling variable) [15][16][17][18][19][20][21][22][23] obtained from analyses of inclusive electron scattering data.…”

Section: Introductionmentioning

confidence: 99%

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Scaling function, spectral function, and nucleon momentum distribution in nuclei

et al. 2011

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The link between the scaling function extracted from the analysis of (e, e ) cross sections and the spectral function/momentum distribution in nuclei is revisited. Several descriptions of the spectral function based on the independent particle model are employed, together with the inclusion of nucleon correlations, and effects of the energy dependence arising from the width of the hole states are investigated. Although some of these approaches provide rough overall agreement with data, they are not found to be capable of reproducing one of the distinctive features of the experimental scaling function, namely its asymmetry. However, the addition of final-state interactions, incorporated in the present study using either relativistic mean-field theory or via a complex optical potential, does lead to asymmetric scaling functions in accordance with data. The present analysis seems to indicate that final-state interactions constitute an essential ingredient and are required to provide a proper description of the experimental scaling function.

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Section: Introductionmentioning

confidence: 99%

“…045504-1 0556-2813/2011/83(4)/045504 (12) ©2011 American Physical Society where σ eN is the electron-nucleon cross section for a moving off-shell nucleon, S(p, E) is the spectral function that gives the probability to find a nucleon of certain momentum and energy in the nucleus [25][26][27], and K is a kinematical factor [28]. In Eq.…”

Section: Introductionmentioning

confidence: 99%

Scaling function, spectral function, and nucleon momentum distribution in nuclei

et al. 2011

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“…6 the CSR predicted by our n(k). Actually this curve was already shown in [12], however we revisit it once more here to illustrate how the attainement of the asymptotic value (namely one) is postponed by the nucleon-nucleon correlations, in particular, the repulsive short-range ones, to larger values of q ( ∼ = 4.6 fm −1 ) than for the Fermi gas situation ( ∼ = 2.46 fm −1 ). To illustrate our second path toward coherence we commence by recalling the alternative model of [17], which deals with the same issues treated in the present paper, namely the scaling function and momentum distribution, but with a different philosophy.…”

Section: The Modelmentioning

confidence: 56%

“…6 the CSR predicted by our n(k). Actually this curve was already shown in [12], however we revisit it once more here to illustrate how the attainement of the asymptotic value (namely one) is postponed by the nucleon-nucleon correlations, in particular, the repulsive short-range ones, to larger values of q ( ∼ = 4.6 fm To illustrate our second path toward coherence we commence by recalling the alternative model of [21], which deals with the same issues treated in the present paper, namely the scaling function and momentum distribution, but with a different philosophy. The study of [21] is based on the use of PWIA (Plane-Wave Impulse Approximation) and has as its starting point the assumption of the factorization of the one-particle exclusive cross section (namely the cross section for the process (e, e ′ N)) according to the expression…”

Section: The Many-body Content Of N(k) and The Csrmentioning

confidence: 97%

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Connecting scaling with short-range correlations

Berardo¹,

Bárbaro²,

Cenni³

et al. 2011

Phys. Rev. C

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We reexamine several issues related to the physics of scaling in electron scattering from nuclei.A basic model is presented in which an assumed form for the momentum distribution having both long-and short-range contributions is incorporated in the single-particle Green function. From this one can obtain saturation of nuclear matter for an NN interaction with medium-range attraction and short-range repulsion, and can obtain the density-density polarization propagator and hence the electromagnetic response and scaling function. For the latter, the shape of the scaling function and how it approaches scaling as a function of momentum transfer are both explored.

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Diagnostic Accuracy of the Social Attention and Communication Surveillance–Revised With Preschool Tool for Early Autism Detection in Very Young Children

et al. 2022

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IMPORTANCE Early identification of children on the autism spectrum is crucial to facilitate access to early supports and services for children and families. The need for improved early autism identification tools is highlighted by the lack of sufficient diagnostic accuracy in current tools. OBJECTIVES To examine the diagnostic accuracy of the Social Attention and CommunicationSurveillance-Revised (SACS-R) and SACS-Preschool (SACS-PR) tools when used with a large, community-based, convenience sample and identify the prevalence of autism in this sample. DESIGN, SETTING, AND PARTICIPANTS This diagnostic accuracy study was conducted inMelbourne, Australia, training maternal and child health nurses who monitored 13 511 children aged 11 to 42 months using the SACS-R and SACS-PR during their routine consultations (June 1, 2013, to July 31, 2018). Children identified as being at high likelihood for autism (12-24 months of age: n = 327; 42 months of age: n = 168) and at low likelihood for autism plus concerns (42 months of age: n = 28) were referred by their maternal and child health nurse for diagnostic assessment by the study team.

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Fermion propagators in space-time

Cited by 3 publications

References 15 publications

Scaling function, spectral function, and nucleon momentum distribution in nuclei

Scaling function, spectral function, and nucleon momentum distribution in nuclei

Connecting scaling with short-range correlations

Diagnostic Accuracy of the Social Attention and Communication Surveillance–Revised With Preschool Tool for Early Autism Detection in Very Young Children

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