Comparison of the quasielastic (e,e’p) and the (γ,p) reactions

Ireland, D. G.; Steenhoven, G. van der

doi:10.1103/physrevc.49.2182

Cited by 42 publications

(68 citation statements)

References 51 publications

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“…Nevertheless, we consider the apparent agreement between the data and the Schwandt calculations of Ref. [83] to be a fortuitous result of an incorrect calculation.…”

Section: A Comparison With Data For T P ≈ 180 Mevmentioning

confidence: 74%

Nuclear transparency to intermediate-energy protons

Kelly

1996

Phys. Rev. C

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Nuclear transparency in the (e, e ′ p) reaction for 135 ≤ T p ≤ 800 MeV is investigated using the distorted wave approximation. Calculations using densitydependent effective interactions, both empirical and theoretical, are compared with phenomenological optical potentials. We find that nuclear transparency is well correlated with proton absorption and neutron total cross sections and that calculations using density-dependent effective interactions provide the best agreement with data. Nuclear transparency calculations are compared with recent electron scattering data for Q 2 < 2 (GeV/c) 2 . For T p < ∼ 200 MeV we find that there is considerable sensitivity to the choice of optical model and that the empirical effective interaction provides the best agreement with the data, but remains 5-10% low. For T p > ∼ 300 MeV we find that there is much less difference between these models, but that the calculations significantly underpredict transparency data and that the discrepancy increases with A. The differences between Glauber and optical model calculations are related to their respective definitions of the semi-inclusive cross section. By using a more inclusive summation over final states the Glauber model emphasizes nucleonnucleon inelasticity, whereas with a more restrictive summation the optical model emphasizes nucleon-nucleus inelasticity; experimental definitions of the semi-inclusive cross section lie between these extremes.

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“…Nevertheless, we consider the apparent agreement between the data and the Schwandt calculations of Ref. [83] to be a fortuitous result of an incorrect calculation.…”

Section: A Comparison With Data For T P ≈ 180 Mevmentioning

confidence: 74%

Nuclear transparency to intermediate-energy protons

Kelly

1996

Phys. Rev. C

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“…Proton knockout reactions at low energies have been used as tools to learn about nuclear structure, high momentum components in the nucleus, nuclear correlations, etc. [1,2,3,4,5]. Two nucleon emission reactions have been encouraged with the hope that they can teach us something about nuclear correlations [3,6,7].…”

Section: Introductionmentioning

confidence: 99%

Inclusive (e, e′ N), (e, e′ NN), (e, e′ π), …v reactions in nuclei

1997

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We study the inclusive (e, e ′ N ), (e, e ′ N N ), (e, e ′ π), (e, e ′ πN ) reactions in nuclei using a Monte Carlo simulation method to treat the multichannel problem of the final state. The input consists of reaction probabilities for the different steps evaluated using microscopical many body methods.We obtain a good agreement with experiment in some channels where there is data and make predictions for other channels which are presently under investigation in several electron laboratories. The comparison of the theoretical results with experiment for several kinematical conditions and diverse channels can serve to learn about different physical processes ocurring in the reaction. The potential of this theoretical tool to make prospections for possible experiments, aiming at pinning down certain reaction probabilities, is also emphasized.

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“…1.4 16 O(e e 0 p) 16 O is a doubly-magic, closed-shell nucleus. Its bound state wavefunction is relatively easy to calculate.…”

Section: Coulomb Distortionmentioning

confidence: 99%

“…

AbstractCoincidence cross sections and the structure functions R L+T T R T and R LT have been obtained for the quasielastic 16 O(e e 0 p) reaction with the proton knocked out from the 1p 1=2 and 1p 3=2 states in perpendicular kinematics. The nominal energy transfer !

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mentioning

confidence: 99%

Study of Quasielastic 1p-shell proton Knockout in the 16O (e,e'p) reaction at Q2=0.8 (GeV/c)2

Gao

1999

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Coincidence cross sections and the structure functions R L+T T R T and R LT have been obtained for the quasielastic 16 O(e e 0 p) reaction with the proton knocked out from the 1p 1=2 and 1p 3=2 states in perpendicular kinematics. The nominal energy transfer ! was 439 MeV, the nominal Q 2 was 0.8 (GeV/c) 2 and the kinetic energy of knocked-out proton was 427 MeV. The data was taken in Hall A, Je erson Laboratory, using two high resolution spectrometers to detect electrons and protons respectively. Nominal beamenergies 845 MeV, 1645 MeV, and 2445 MeV were employed. For each beam energy, the momentum and angle of electron arm were xed, while the angle between the proton momentum and the momentum transferq was varied to map out the missing momentum. R LT was separated out to 350 MeV/c in missing momentum. R L+T T and R T were separated out to 280 MeV/c in missing momentum. R L and R T were separated at a missing momentum of 52.5 MeV/c for the data taken with hadron arm alongq.The measured cross sections and response functions agree with both relativistic and non-relativistic DWIA calculations employing spectroscopic factors between 60-75% for 1p 1=2 and 1p 3=2 states. The left-right asymmetry does not support the nonrelativistic DWIA calculation using the Weyl gauge. Also, the left-right asymmetry measurement favors the relativistic calculation.This thesis describes the details of the experimental setup, the calibration of the spectrometers, the techniques used in the data analysis to derive the nal cross sections as well as the response functions, and the comparison of the results with the theoretical calculations.

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Comparison of the quasielastic (e,e’p) and the (γ,p) reactions

Cited by 42 publications

References 51 publications

Nuclear transparency to intermediate-energy protons

Nuclear transparency to intermediate-energy protons

Inclusive (e, e′ N), (e, e′ NN), (e, e′ π), …v reactions in nuclei

Study of Quasielastic 1p-shell proton Knockout in the <sup>16</sup>O (e,e'p) reaction at Q<sup>2</sup>=0.8 (GeV/c)<sup>2</sup>

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