期刊
PHYSICS LETTERS B
卷 481, 期 2-4, 页码 171-176出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(00)00441-X
关键词
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Exclusive differential cross sections of virtual-photon radiative proton capture in pd --> He-3 + e(+)e(-) at a proton energy of 190 MeV have been measured for the first time. The leptonic-angle dependence of the measured cross section is exploited in order to determine the electromagnetic response functions in the time-like region. The data are compared to a relativistic gauge-invariant impulse approximation and a Faddeev calculation. Differences between theoretical predictions and data are discussed in terms of enhanced magnetic radiation possibly originating from virtual Delta excitations. (C) 2000 Elsevier Science B.V. All rights reserved.
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