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Your search keyword '"Groep, D."' showing total 3 results
Start Over Author "Groep, D." Topic electron-scattering
3 results on '"Groep, D."'

1. O-16(e,e ' p) reaction at large missing energy

Author

Iodice, M., Cisbani, E., De Leo, R., Frullani, S., Garibaldi, F., Groep, D. L., Hesselink, W. H. A., Jans, E., Lapikas, L., Onderwater, C. J. G., Perrino, R., Ryckebusch, J., Starink, R., Urciuoli, G. M., and Precision Frontier

Subjects
ELECTRON-SCATTERING, two-body currents, electron-induced knockout reactions, Nuclear Theory, FACILITY, SHORT-RANGE CORRELATIONS, O-16, Nuclear Experiment
Abstract

We investigate the origin of the strength at large missing energies in electron-induced proton knockout reactions. For that purpose the reaction 160(e. e'p) was studied at a central value w) = 215 MeV of the energy transfer, and two values of the momentum transfer: q = 300, 400 MeV/c, corresponding to the "dip region". Differential cross sections were determined in a large range of missing energy (E-m = 0-140 MeV) and proton emission angle (gamma(pq),, = 0- 110 degrees), and compared to predictions of a model that includes nucleon-nucleon short-range correlations and two-body currents. It is observed that, in the kinematic domain covered by this experiment, the largest contribution to the cross section stems from two-body currents, while short-range correlations contribute a significant fraction. (C) 2007 Elsevier B.V. All rights reserved.

Published
2007

2. Comparison between the transverse responses of the reactions C-12(e, e(') p)B-11 and C-12(gamma, p)B-11

Author

Morrow, SA, Arneil, J, Aschenauer, EC, van Batenburg, MF, Blok, HP, Boersma, DJ, Branford, D, Davinson, T, DeMeyer, G, Ducret, JE, Hesselink, WHA, Groep, D, Hicks, K, Ireland, DG, Kalantar-Nayestanaki, N, Lapikas, L, Liang, M, Mackenzie, J, Marchand, C, Medaglia, R, Ryckebusch, J, van Sambeek, M, Starink, R, van der Steenhoven, G, van Uden, MA, de Vries, H, and Research unit Nuclear & Hadron Physics

Subjects
MESON-EXCHANGE CURRENTS, ELECTRON-SCATTERING, 2-STEP PROCESSES, = 1 QUASIDEUTERON, RELATIVISTIC CALCULATIONS, GAMMA,P REACTIONS, PHOTONUCLEAR REACTIONS, DIRECT KNOCKOUT MECHANISM, HIGH-RESOLUTION, REACTION C-12(E,E'P)B-11
Abstract

A study of the reaction C-12(e,e'p)B-11 in parallel kinematics has been made for the missing-momentum region 250

Published
2005

3. Alpha-cluster knockout in the O-16(e,e 'alpha)C-12 reaction

Author

De Meyer, G, Aschenauer, EC, Blok, HP, Groep, D, Hicks, K, Holvoet, H, Jans, E, Lapikas, L, Lannoy, B, Nooren, GJL, Onderwater, CJG, Ryckbosch, D, Schipper, JD, Steijger, JJM, Steenbakkers, MFM, Tytgat, M, van der Steenhoven, G, Van de Vyver, R, Van Hoorebeke, L, van Uden, MA, and Volmer, J

Subjects
MECHANISM, four-nucleon correlations, alpha-clustering, electron-induced knockout reactions, PION-NUCLEUS INTERACTIONS, SHELL, ELECTRON-SCATTERING, SPECTROSCOPIC FACTORS, ABSORPTION, SHORT-RANGE CORRELATIONS, O-16, LI-6, P-ALPHA REACTION
Abstract

The knockout of a-clusters induced by electrons has been used to study four-nucleon correlations in O-16. For the transition to the ground state of C-12 the (e, e ' alpha) cross section has been measured for three values of the momentum transfer and four values of the missing momentum. The momentum-transfer dependence gives evidence for a quasi-elastic alpha -knockout mechanism. The shape of the measured missing-momentum distribution is reasonably well described by shell-model and cluster-model calculations, but the theoretical curves overshoot the data by a factor three to four

Published
2001

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