First measurements of the 16O(e, e'pn)14N reaction

Middleton, D. G.; Annand, J. R. M.; Barbieri, C.; Barneo, P.; Blok, H. P.; Böhm, R.; Distler, M. O.; Friedrich, J.; Giusti, C.; Glazier, D. I.; Grabmayr, P.; Hehl, T.; Heim, Joel B.; Hesselink, W.H.A.; Jans, E.; Köhl, M.; Lapikás, L.; MacGregor, I. J. D.; Martin, Ian; McGeorge, J. C.; Merkel, H.; Moschini, F.; Rosner, G.; Seimetz, M.; Vries, H. de; Walcher, Th.; Watts, D. P.; Zihlmann, B.

doi:10.1140/epja/i2005-10314-9

Cited by 18 publications

(32 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar two-nucleon knockout study can also be performed using an 16 O projectile, for which np pair knockout using electromagnetic probes has been measured [37,38] and supports the SRC observations for 12 C. In this case, the 14 O residue is also of interest, given that only the 0 + ground state is bound, and where the results of Refs. [13,36] indicate a correspondingly small cross section and a narrow momentum distribution, consistent with theoretical expectations.…”

Section: Discussionsupporting

confidence: 66%

Two-nucleon correlation effects in knockout reactions fromC12

Simpson

Tostevin

2011

Phys. Rev. C

View full text Add to dashboard Cite

Reactions that involve the direct and sudden removal of a pair of like or unlike nucleons from a fast projectile beam by a light target nucleus are considered. Specifically, we study the three two-nucleon removal channels from 12 C that populate final states in the 10 Be, 10 B, and 10 C reaction residues. The calculated two-nucleon removal cross sections and the residue momentum distributions are compared with available high-energy data at 250, 1050, and 2010 MeV per nucleon, i.e., data that are inclusive with respect to the bound final states of the residues. The measured np removal cross sections only are significantly greater than the values calculated, suggesting that the reaction mechanism observes enhanced np spatial correlations compared to those present in the shell-model wave functions.

show abstract

Section: Discussionsupporting

confidence: 66%

Two-nucleon correlation effects in knockout reactions fromC12

Simpson

Tostevin

2011

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…We suggest that only ppn triples in a "close" configuration contribute and we count the number of SRC triples with the aid of the Eq. (40). The ppn contributions will be larger than the pnn ones due to the magnitude of the electromagnetic coupling.…”

Section: Three-body Correlationsmentioning

confidence: 99%

“…High-resolution (e, e pn) measurements which have the potential to access the pn correlations are very challenging [40]. Theoretical (e, e pn) calculations [36,41,42] have predicted that the tensor parts of the SRC are responsible for the fact that the correlated pn strength is typically a factor of 10 bigger than the correlated pp strength.…”

Section: Quantifying Two-nucleon Correlationsmentioning

confidence: 99%

Quantifying short-range correlations in nuclei

2012

View full text Add to dashboard Cite

Background Short-range correlations (SRC) are an important ingredient of the dynamics of nuclei.Purpose An approximate method to quantify the magnitude of the two-nucleon (2N) and three-nucleon (3N) short-range correlations (SRC) and their mass dependence is proposed.Method The proposed method relies on the concept of the "universality" or "local nuclear character" of the SRC. We quantify the SRC by computing the number of independent-particle model (IPM) nucleon pairs and triples which reveal beyondmean-field behavior. It is argued that those can be identified by counting the number of nucleon pairs and triples in a zero relative orbital momentum state. A method to determine the quantum numbers of pairs and triples in an arbitrary mean-field basis is outlined.Results The mass dependence of the 2N and 3N SRC is studied. The predictions are compared to measurements. This includes the ratio of the inclusive inelastic electron scattering cross sections of nuclei to 2 H and 3 He at large values of the Bjorken variable. Corrections stemming from the center-of-mass motion of the pairs are estimated.Conclusions We find that the relative probability per nucleon for 2N and 3N SRC has a soft dependence with mass number A and that the proton-neutron 2N SRC outnumber the proton-proton (neutron-neutron) 2N SRC. A linear relationship between the magnitude of the EMC effect and the predicted number of proton-neutron SRC pairs is observed. This provides support for the role of local nuclear dynamics on the EMC effect.

show abstract

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

2015

Self Cite

View full text Add to dashboard Cite

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.

show abstract

First measurements of the 16O(e, e'pn)14N reaction

Cited by 18 publications

References 40 publications

Two-nucleon correlation effects in knockout reactions fromC12

Two-nucleon correlation effects in knockout reactions fromC12

Quantifying short-range correlations in nuclei

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

Contact Info

Product

Resources

About