High proton momenta and nucleon-nucleon correlations in the reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>He(e,e’p)

Marchand, Claude; Bernheim, M.; Dunn, P.C.; Gérard, A.; Laget, J. M.; Magnon, A.; Morgenstern, J.; Mougey, J.; Picard, J.; Reffay-Pikeroen, D.; Turck‐Chièze, S.; Vernin, P.; Brussel, M.K.; Capitani, G. P.; Sanctis, E. De; Frullani, S.; Garibaldi, F.

doi:10.1103/physrevlett.60.1703

Cited by 92 publications

(39 citation statements)

References 16 publications

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“…Experimental momentum distributions for the transitions to the ground state and first excited state of 6 He have been measured via the reaction 7 Li(e, e ′ p) 6 He, in the missing momentum range from -70 to 260 MeV/c. They are compared to theoretical distributions calculated with mean-field wave functions and with variational Monte Carlo (VMC) wave functions which include strong state-dependent correlations in both 7 Li and 6 He. These VMC calculations provide a parameter-free prediction of the momentum distribution that reproduces the measured data, including its normalization.…”

mentioning

confidence: 99%

Nuclear Structure Studies with the7Li(e,e′p)
Lapikás
¹
,
Wesseling
²
,
Wiringa
³

1999
Phys. Rev. Lett.
64
9
106
0
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Experimental momentum distributions for the transitions to the ground state and first excited state of 6 He have been measured via the reaction 7 Li͑e, e 0 p͒ 6 He. They are compared to theoretical distributions calculated with variational Monte Carlo (VMC) wave functions which include strong state-dependent correlations in both 7 Li and 6 He. These VMC calculations provide a parameter-free prediction that reproduces the measured data, including its normalization. The deduced spectroscopic factor for the two transitions is 0.58 6 0.05, in perfect agreement with the VMC value of 0.60. This is the first successful comparison of experiment and ab initio theory for spectroscopic factors in p-shell nuclei.

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mentioning

confidence: 99%

Nuclear Structure Studies with the7Li(e,e′p)
Lapikás
¹
,
Wesseling
²
,
Wiringa
³

1999
Phys. Rev. Lett.
64
9
106
0
View full text Add to dashboard Cite

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“…Measurements for performed at Saclay (141,147) have shown that for large momenta there is a prominent peak in the missing-energy distribution whose centroid is consistent with this quasideuteron mechanism and that the momentum distribution for is similar to that of the deuteron. One member of the pair is detected in the experiment while the undetected spectator carries away a large kinetic energy, thereby representing a large excitation energy with respect to the ground state of the A -1 system.…”

Section: Continuum Contributionsmentioning

confidence: 93%

Advances in Nuclear Physics

2002

Advances in Nuclear Physics

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A Continuation Order Plan is available for this series. A continuation order will bring delivery of each new volume immediately upon publication. Volumes are billed only upon actual shipment. PREFACEThis volume of Advances in Nuclear Physics addresses two very different frontiers of contemporary nuclear physics -one highly theoretical and the other solidly phenomenological.The first article by Matthias Burkardt provides a pedagogical overview of the timely topic of light front quantization. Although introduced decades ago by Dirac, light front quantization has been a central focus in theoretical nuclear and particle physics in recent years for two major reasons. The first, as discussed in detail by Burkardt, is that light-cone coordinates are the natural coordinates for describing high-energy scattering. The wealth of data in recent years on nucleon and nucleus structure functions from high-energy lepton and hadron scattering thus provides a strong impetus for understanding QCD on the light cone. Second, as theorists have explored light front quantization, a host of deep and intriguing theoretical questions have arisen associated with the triviality of the vacuum, the role of zero modes, rotational invariance, and renormalization. These issues are so compelling that they are now intensively investigated on their own merit, independent of the particular application to high-energy scattering. This article provides an excellent introduction and overview of the motivation from high-energy scattering, an accessible description of the basic ideas, an insightful discussion of the open problems, and a helpful guide to the specialized literature. It is an ideal opportunity for those with a spectator's acquaintance to develop a deeper understanding of this important field.The second article provides a comprehensive review by James Kelly of major advances in the field of electron-induced nucleon knockout reactions.In principle, knockout of a nucleon by the known electromagnetic current provides a powerful tool to explore the energy and momentum distribution of protons and neutrons in finite nuclei. The advent of high duty-factor accelerators, polarized beams, out-of-plane detectors, and increased kinematic range and resolution has dramatically expanded our experimental horizons, and brings us far closer to exploiting the full potential of this probe. Kelly's xi xii Preface article provides a thorough review of the basic framework for extracting nuclear structure information from knockout reactions and surveys major new experimental results. It is also extremely useful in highlighting the limitations in our understanding of these reactions arising from theoretical uncertainties in the optical potential, off-shell nucleon currents, and the reaction mechanism. The combination of the recent experiments reviewed here and those about to begin at new facilities represents a major advance in nuclear physics, and this article provides both an excellent introduction for nonspecialists and a comprehensive overview for those in the fie...

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“…In fact, Kohno 19 pointed out that the mesonic contribution could change the ratio R G by as much as 10% for I2 C. Evidence for nucleon-nucleon correlations was presented in a study of the 3 HeO,ep) reaction. 24 Further calculations are needed to get insight into the role of these two effects for the 6 Li(e,e'p) reaction.…”

Section: Quasielastic Electron Scattering Is Assumed To Be Dominated mentioning

confidence: 99%

Two-Body Mechanisms in theLi6(e,e′p) Reaction

Lanen¹,

Blok²,

Jans³

et al. 1990

Phys. Rev. Lett.

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The ratio of transverse and longitudinal response functions is investigated for the quasielastic reaction 6 Li(e,e'p). The ratio itself and its dependence on the missing energy cannot be explained in the distorted-wave impulse approximation. It is proposed that a reaction mechanism other than quasielastic one-body knockout plays a significant role. PACS numbers: 25.30.Fj, 27.20.+n Quasielastic electron scattering is assumed to be dominated by processes involving the direct coupling of a virtual photon to one single nucleon inside the nucleus. Usually the free nucleon current is taken to describe this process. This latter assumption is often referred to as the impulse approximation. Hence it came as a surprise that the observed ratio of transverse and longitudinal (T/L) response functions in inclusive quasielastic electron-scattering data appears enhanced for various nuclei. l In order to explain this breakdown of the impulse approximation, among other hypotheses, exotic models were developed, 2 inspired by the idea that electromagnetic properties of a nucleon inside nuclei might be density dependent. In order to study this phenomenon in more detail, exclusive (e.e'p) experiments in quasielastic kinematics on various nuclei were carried out with the aim of separating transverse and longitudinal nuclear structure functions. 3 " 7 In all cases significant deviations from the ratio of free-proton response functions have been found. One of the most striking observations is the enhancement of the T/L ratio beyond the two-particle emission threshold in 12^ 7,8 jjjjg enhancement has been attributed to the onset of a two-body emission process. More evidence for many-body mechanisms in (e.e'p) was found at MITBates in a series of l2 C(e,e'p) experiments in the quasielastic and dip region; 9,10 a significantly enhanced continuum strength in the region corresponding to Is knockout of dominantly transverse character was observed.In this Letter we investigate the role of two-body processes in the quasielastic reaction 6 Li(e,e'p). Since the residual nucleus 5 He is unbound, the two-particle emission threshold equals the separation energy of 3.7 MeV of the 6 Li(e,e'p) reaction. Therefore effects of a twobody mechanism might already be important in the description of \p proton knockout from 6 Li. We investigate these mechanisms in the 6 Li(e,e'p) reaction by studying the behavior of the T/L ratio as a function of the missing energy. The experimental values of the T/L ratio have been extracted from a proton spectral function study 11,12 of 6 Li following the method described in Ref.13. We will discuss this method and apply it to our 6 Li(e,e'p) data. Results will then be compared to T/L ratios obtained with a different method 4 in an independent experiment.In parallel kinematics, where the momentum p of the outgoing proton is parallel to the momentum transfer q, only the longitudinal and transverse structure functions Wi and Wj contribute to the sixfold differential cross section for the reaction (e,e'p): 14 d 6 a dEedSledEpdClp ...

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High proton momenta and nucleon-nucleon correlations in the reaction3He(e,e’p)

Cited by 92 publications

References 16 publications

Nuclear Structure Studies with the7Li(e,e′p)
Lapikás
¹
,
Wesseling
²
,
Wiringa
³

1999
Phys. Rev. Lett.
64
9
106
0
View full text Add to dashboard Cite

Nuclear Structure Studies with the7Li(e,e′p)
Lapikás
¹
,
Wesseling
²
,
Wiringa
³

1999
Phys. Rev. Lett.
64
9
106
0
View full text Add to dashboard Cite

Advances in Nuclear Physics

Two-Body Mechanisms in theLi6(e,e′p) Reaction

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High proton momenta and nucleon-nucleon correlations in the reaction3He(e,e’p)

Cited by 92 publications

References 16 publications

Nuclear Structure Studies with the7Li(e,e′p)Lapikás1, Wesseling2, Wiringa3 1999Phys. Rev. Lett.6491060View full textAdd to dashboardCite

Nuclear Structure Studies with the7Li(e,e′p)Lapikás1, Wesseling2, Wiringa3 1999Phys. Rev. Lett.6491060View full textAdd to dashboardCite

Advances in Nuclear Physics

Two-Body Mechanisms in theLi6(e,e′p) Reaction

Contact Info

Product

Resources

About

Nuclear Structure Studies with the7Li(e,e′p)
Lapikás
¹
,
Wesseling
²
,
Wiringa
³

1999
Phys. Rev. Lett.
64
9
106
0
View full text Add to dashboard Cite

Nuclear Structure Studies with the7Li(e,e′p)
Lapikás
¹
,
Wesseling
²
,
Wiringa
³

1999
Phys. Rev. Lett.
64
9
106
0
View full text Add to dashboard Cite