Phys. Rev. Lett. 90, 232502 (2003) [5 pages]High Resolution Spectroscopy of the Λ12B Hypernucleus Produced by the (e,e′K+) ReactionReceived 29 October 2002; published 10 June 2003 High-energy, cw electron beams at new accelerator facilities allow electromagnetic production and precision study of hypernuclear structure, and we report here on the first experiment demonstrating the potential of the (e,e′K+) reaction for hypernuclear spectroscopy. This experiment is also the first to take advantage of the enhanced virtual photon flux available when electrons are scattered at approximately zero degrees. The observed energy resolution was found to be ≈900 keV for the Λ12B spectrum, and is substantially better than any previous hypernuclear experiment using magnetic spectrometers. The positions of the major excitations are found to be in agreement with a theoretical prediction and with a previous binding energy measurement, but additional structure is also observed in the core excited region, underlining the future promise of this technique. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.232502
DOI:
10.1103/PhysRevLett.90.232502
PACS:
21.80.+a, 25.30.Rw
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