Search for p-nucleus states using the (p, p) knock-out reaction at 600 MeV/c

E. Aslanides*, D. M. Drake, J. C. Peng, D. Garreta, P. Birien, G. Bruge, H. Catz, A. Chaumeaux, S. Janouin, D. Legrand, M. C. Lemaire, B. Mayer, J. Pain, F. Perrot, M. Berrada, J. P. Bocquet, E. Monnand, J. Mougey, P. Perrin, O. BingJ. Lichtenstadt, A. I. Yavin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The knock-out reaction A(p, p)X has been used to search for narrow p-nucleus states. The experiment was performed using the 600 MeV/c antiproton beam at LEAR and the high-resolution and large-acceptance magnetic spectrometer SPES II. The A-dependence of the annihilation-induced proton spectra has been studied on 2H, 6Li, 12C, 63Cu, 208Pb and 209Bi. The quasi-free elastic pp scattering observed in the lighter targets, and the comparison with the free pp scattering, also observed in this experiment, determine an effective proton number Neff for 1s- and 1p-shell protons. No evidence for narrow bound or resonant p-nucleus states could be found. Upper limits for their production are one order of magnitude lower than certain theoretical predictions, but consistent with the properties of the p-nucleus interaction, as established from recent elastic and inelastic scattering as well as from studies of antiprotonic atoms.

Original languageEnglish
Pages (from-to)445-460
Number of pages16
JournalNuclear Physics A
Issue number3-4
StatePublished - 31 Aug 1987


FundersFunder number
Fund for Basic Research of the Israel Academy of Sciences


    • Nuclear reactions


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