Density dependence of 2p-2h meson-exchange currents

Amaro, J. E.; Bárbaro, M. B.; Caballero, J. A.; Pace, A. De; Donnelly, T. W.; Megías, G. D.; Simó, I. Ruiz

doi:10.1103/physrevc.95.065502

Cited by 25 publications

(36 citation statements)

References 41 publications

(59 reference statements)

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“…This is clearly observed in the right panel where it is shown that all data overlap within their error bars. This result confirms our previous study in [51], where we predicted that 2p2h response scales as k 3 F . It is important to point out that the minimum in the cross section shown in Fig.…”

supporting

confidence: 93%

Mean-field and two-body nuclear effects in inclusive electron scattering on argon, carbon, and titanium: The superscaling approach

et al. 2019

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We compare the predictions of the SuSAv2 model including two-particle two-hole meson-exchange currents with the recent JLab data for inclusive electron scattering on three different targets (C, Ar and Ti). The agreement is very good over the full energy spectrum, with some discrepancy seen only in the deep inelastic region. The 2p2h response, peaked in the dip region between the quasielastic and ∆-resonance peak, is essential to reproduce the data. We also analyze the kF (Fermi momentum) dependence of the data in terms of scaling of second kind, showing that the 2p2h response scales very differently from the quasielastic one, in full accord with what is predicted by the model. The results represent a valuable test of the applicability of the model to neutrino scattering processes on different nuclei.

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confidence: 93%

Mean-field and two-body nuclear effects in inclusive electron scattering on argon, carbon, and titanium: The superscaling approach

et al. 2019

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“…We used the parallel version of Flexible Atomic Code 3 (FAC v1.1.5) (Gu 2008) to compute the electronic structures of Fe XVII-XVI ions. We evaluated DR, DE, and RE with extended sets of configurations, full-order configuration mixing, and Breit interaction (Amaro et al 2017;Shah et al 2018). For DC channels of both DR and RE, we included 2s 2 2p 5 nln l and 2s2p 6 nln l configurations.…”

Section: Theorymentioning

confidence: 99%

Revisiting the Fe xvii Line Emission Problem: Laboratory Measurements of the 3s–2p and 3d–2p Line-formation Channels

Shah

López‐Urrutia

et al. 2019

ApJ

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We determined relative X-ray photon emission cross sections in Fe XVII ions that were mono-energetically excited in an electron beam ion trap. Line formation for the 3s (3s − 2p) and 3d (3d − 2p) transitions of interest proceeds through dielectronic recombination (DR), direct electron-impact excitation (DE), resonant excitation (RE), and radiative cascades. By reducing the electron-energy spread to a sixth of that of previous works and increasing counting statistics by three orders of magnitude, we account for hitherto unresolved contributions from DR and the little-studied RE process to the 3d transitions, and also for cascade population of the 3s line manifold through forbidden states. We found good agreement with state-of-the-art many-body perturbation theory (MBPT) and distorted-wave (DW) method for the 3s transition, while in the 3d transitions known discrepancies were confirmed. Our results show that DW calculations overestimate the 3d line emission due to DE by ∼20%. Inclusion of electron-electron correlation effects through the MBPT method in the DE cross section calculations reduces this disagreement by ∼11%. The remaining ∼9% in 3d and ∼11% in 3s/3d discrepancies are consistent with those found in previous laboratory measurements, solar, and astrophysical observations. Meanwhile, spectral models of opacity, temperature, and turbulence velocity should be adjusted to these experimental cross sections to optimize the accuracy of plasma diagnostics based on these bright soft X-ray lines of Fe XVII.

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“…Thus, the SuSAv2-MEC approach [2,3,4] is applied to the analysis of data from ν oscillation experiments with the aim of shedding light on the systematics arising from nuclear effects in both initial and final states. For practical purposes, the SuSAv2 model and the 2p-2h MEC contributions can be described in a simple way for different kinematics and nuclei [5,6,7,8,9], translating sophisticated and demanding microscopic calculations into a relatively straightforward formalism hence easing its implementation in event generators. In Fig.…”

mentioning

confidence: 99%

Modeling Neutrino-Nucleus Interactions for Neutrino Oscillation Experiments

Megías¹,

Dolan²,

Bolognesi³

2019

Springer Proceedings in Physics

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We present our recent progress on the relativistic modeling of neutrinonucleus reactions for their implementation in MonteCarlo event generators (GENIE, NEUT) employed in neutrino oscillation experiments. We compare charged-current neutrino (ν) and antineutrino (ν) cross sections obtained within the SuSAv2 model, which is based on the Relativistic Mean Field theory and on the analysis of the superscaling behavior exhibited by (e, e ′ ) data. We also evaluate and discuss the impact of multi-nucleon excitations arising from 2p-2h states excited by the action of weak forces in a fully relativistic framework, showing for the first time their implementation in GENIE and their comparison with recent T2K data.

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Density dependence of 2p-2h meson-exchange currents

Cited by 25 publications

References 41 publications

Mean-field and two-body nuclear effects in inclusive electron scattering on argon, carbon, and titanium: The superscaling approach

Mean-field and two-body nuclear effects in inclusive electron scattering on argon, carbon, and titanium: The superscaling approach

Revisiting the Fe xvii Line Emission Problem: Laboratory Measurements of the 3s–2p and 3d–2p Line-formation Channels

Modeling Neutrino-Nucleus Interactions for Neutrino Oscillation Experiments

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