Effects of rescattering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>e</mml:mi><mml:mo>,</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mi>p</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>reactions within a semiclassical model

Barbieri, C.; Lapikás, L.

doi:10.1103/physrevc.70.054612

Cited by 36 publications

(89 citation statements)

References 41 publications

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“…Historically, several electron scattering studies have provided a wealth of information on nuclear spectral functions (see [2][3][4][5][6][7][8][9] and references therein). This has allowed a rather complete characterisation of correlations for stable nuclei [1].…”

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confidence: 99%

Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain

2015

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Background: Three-nucleon forces (3NFs) have non trivial implications on the evolution of correlations at extreme proton-neutron asymmetries. Recent ab initio calculations show that leading order chiral interactions are crucial to obtain the correct binding energies and neutron driplines along the O, N, and F chains, Ref.[A. Cipollone, C. Barbieri, P. Navrátil, Phys. Rev. Lett 111, 062501 (2013)].Purpose: Here, we discuss the impact of 3NFs along the oxygen chain for other quantities of interest, such has the spectral distribution for attachment and removal of a nucleon, spectroscopic factors and radii. The objective is to better delineate the general effects of 3NFs on nuclear correlations. Methods:We employ self-consistent Green's function (SCGF) theory which allows a comprehensive calculation of the single particle spectral function. For the closed subshell isotopes, 14 O, 16 O, 22 O, 24 O and 28 O, we perform calculations with the Dyson-ADC(3) method which is fully non-perturbative and is the state of the art for both nuclear physic and quantum chemistry applications. The remaining open shell isotopes are studied using the newly developed Gorkov-SCGF formalism up to second order. Results:We produce complete plots for the spectral distributions. The spectroscopic factors for the dominant quasiparticle peaks are found to depend very little on the leading order (NNLO) chiral 3NFs. The latters have small impact on the calculated matter radii, which, however are consistently obtained smaller than experiment. Similarly, single particle spectra tend to be too spread with respect to the experiment. This effect might hinder, to some extent, the onset of correlations and screen the quenching of calculated spectroscopic factors. The most important effect of 3NFs is thus the fine tuning of the energies for the dominant quasiparticle states, which governs the shell evolution and the position of driplines.Conclusions: Although present chiral NNLO 3NFs interactions do reproduce the binding energies correctly in this mass region, the details of the nuclear spectral function remain at odd with the experiment showing too small radii and a too spread single particle spectrum, similar to what already pointed out for larger masses. This suggests a lack of repulsion in the present model of NN+3N interactions which is mildly apparent already for masses in the A=14-28 range.

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confidence: 99%

Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain

2015

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“…(1), is included (full line) one compares the experiment to the assumed input spectral function S h (k, E), showing the quality of the fit around the correlated peak. It is also seen that the contribution from rescattering processes (dashed line) is negligible in this region and increases only at very large missing energies [22]. Thus, validating the choice of taking the input spectral function in this region form the experiment.…”

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“…(2) predicts little or negligible effects from FSI in the region of the comparison (see Ref. [22] and discussion of Fig. 1 below).…”

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“…This has been studied recently in Refs. [22,23] using a semiclassical model, which has the advantage of describing the distortion due to FSI in terms of the full one-hole spectral function. This accounts for both the momentum and the energy distribution of the original correlated strength, which is of importance for the proper description of the response [24].…”

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“…Three channels are possible, in which a represents either a proton (with N ′ = p or n) or a neutron (with N ′ = p). The semi-exclusive cross section for these events was calculated semiclassically as [22] …”

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Final state interactions in electron scattering at high missing energies and momenta

Barbieri

2006

Nuclear Physics B - Proceedings Supplements

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Calculations of two-step rescattering and pion emission for the 12 C(e, e ′ p) reaction at very large missing energies and momenta are compared with recent data from TJNAF. For parallel kinematics, final state interactions are strongly reduced by kinematical constraints. A good agreement between calculation and experiment is found for this kinematics when one admits the presence of high momentum components in the nuclear wave function. In recent years, electron scattering experiments have been possible with kinematics that involve large energies and momentum transfered, as for example in studies of nuclear transparency. In this regime, the final state interactions (FSI) for the knock out of a nucleon are usually treated employing Glauber inspired calculations [1,2,3,4]. Such techniques, together with the experience gained in related nuclear structure studies, provide a useful starting point to pursue accurate predictions of neutrino-nucleus interactions at high energy. This was pointed out by various contributions to this conference.At scattering energies of the order of GeV, the leptoninc probe can resolve the high-momentum tail of the spectral function generated by shortrange (central and tensor) correlations (SRC). This represent about 10-20% of the total spectral strength [5,6] and is found along a ridge in the momentum-energy plane (k-E) which spans a region of several hundred MeV/c (MeV) [7,9,8]. This corresponds to large missing momenta (p m ) and energies (E m ) in knock out cross sections. This contribution to the spectral function is also responsible for most of the binding energy of nuclear systems [10]. The main characteristics pre- * Email: C.Barbieri@gsi.de † Present address: Gesellschaft für Schwerionenforshung, Planckstr. 1, 64291, Darmstadt, Germany dicted by these calculations are confirmed by recent experimental data [11,12,13], which will be considered further below. Locating this strength experimentally, at both large E m and p m , is difficult because it is spread over an energy range of several hundred MeV, so the total density of the spectral function is very low. In this energy regime multi-nucleon processes, beyond the direct knock out, are possible [14] and can induce large shifts in the missing energies and momenta, moving strength to regions where the direct signal is much smaller and therefore submerging it. As it will be discussed below, the effects of FSI become larger and less controllable when the transverse structure functions that enter the expression of the (e, e ′ p) cross section dominate the longitudinal one. This trend is predicted by several theoretical studies [14,15,16,17,18]. The issue of how to control FSI in lepton scattering experiments has been discussed in detail in Ref. [19,20] for the particular case of kinematics sensitive to the SRC tail of the nuclear spectral function. A Monte Carlo simulation and kinematical arguments led to the suggestion that the best chance for an identification of SRC occurs in parallel kinematics 3 .3 In this work we refer to 'paralle...

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On the nature of interactions in the F₂OXe^…NCCH₃complex: Is there the Xe(IV)N bond?

et al. 2016

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Nature of the bonding in isolated XeOF2 molecule and F2 OXe(…) NCCH3 complexes have been studied in the gas phase (0 K) using Quantum Chemical Topology methods. The wave functions have been approximated at the MP2 and DFT levels of calculations, using the APFD, B3LYP, M062X, and B2PLYP functionals with the GD3 dispersion correction. The nature of the formal XeO bond in the XeOF2 monomer depends on the basis set used (all-electron vs. the ecp-28 approximation for Xe). Within the all-electron basis set approach the bond is represented by two bonding attractors, Vi = 1,2 (Xe,O), with total population of about 1.06e and highly delocalized electron density in both bonding basins. No bonding basins are observed using the ecp-28 approximation. These results shows that the nature of xenon-oxygen is complicated and may be described with mesomeric equilibrium of the Lewis representations: Xe((+)) O((-)) and Xe((-)) O((+)) . For both the xenon-oxygen and xenon-fluorine interactions the charge-shift model can be applied. The F2 OXe(…) NCCH3 complex exists in two structures: "parallel," stabilized by non-covalent C(…) O and Xe(…) N interactions and "linear" stabilized by the Xe(…) N interaction. Topological analysis of ELF shows that the F2 OXe(…) NCCH3 molecule appears as a weakly bound intermolecular complex. Intermolecular interaction energy components have also been studied using Symmetry Adapted Perturbation Theory. © 2016 Wiley Periodicals, Inc.

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Effects of rescattering in(e,e′p)reactions within a semiclassical model

Cited by 36 publications

References 41 publications

Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain

Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain

Final state interactions in electron scattering at high missing energies and momenta

On the nature of interactions in the F₂OXe^…NCCH₃complex: Is there the Xe(IV)N bond?

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Effects of rescattering in(e,e′p)reactions within a semiclassical model

Cited by 36 publications

References 41 publications

Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain

Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain

Final state interactions in electron scattering at high missing energies and momenta

On the nature of interactions in the F2OXe…NCCH3complex: Is there the Xe(IV)N bond?

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On the nature of interactions in the F₂OXe^…NCCH₃complex: Is there the Xe(IV)N bond?