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First measurement of the exclusive (p, e+e−) reaction

✍ Scribed by E. Traneus; Thomas B. Bright; B. Höistad; R. Johansson; J. Thun; G.S. Adams

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 727 KB
Volume: 613
Category: Article
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(96)00420-4

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✦ Synopsis

We present the first data on the exclusive (p, e+e -) reaction in a nucleus. Cross sections for populating the ground state and first excited state in the residual nucleus are presented for the reaction llB(p,e+e-)12C at 98 MeV. The e+e -momentum vectors were measured with a high-resolution magnetic pair spectrometer. The distributions of the virtual photon invariant mass and of the direction of the electron in the virtual photon rest system are compared with a simple single-nucleon model. The (p, e+e -) cross sections are compared with corresponding data for the (p, y) reaction obtained with the same apparatus. The (p, e+e -) cross sections show substantial enhancement over what is expected from the simple model.

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