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Antiproton slowing down in H2 and He and evidence of nuclear stopping power

  • M. Agnello
  • , G. Belli
  • , G. Bendiscioli
  • , A. Bertin
  • , E. Botta
  • , T. Bressani
  • , M. Bruschi
  • , M. P. Bussa
  • , L. Busso
  • , D. Calvo
  • , B. Cereda
  • , P. G. Cerello
  • , C. Cicalò
  • , M. Corradini
  • , S. Costa
  • , S. De Castro
  • , A. Donzella
  • , A. Feliciello
  • , L. Ferrero
  • , A. Filippi
  • V. Filippini, A. Fontana, D. Galli, R. Garfagnini, B. Giacobbe, P. Gianotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lanaro, E. Lodi Rizzini, V. Lucherini, S. Marcello, U. Marconi, A. Masoni, B. Minetti, P. Montagna, M. Morando, F. Nichitiu, D. Panzieri, G. Pauli, M. Piccinini, G. Puddu, E. Rossetto, A. Rotondi, A. M. Rozhdestvensky, A. Saino, P. Salvini, L. Santi, M. G. Sapozhnikov, N. Semprini Cesari, S. Serci, R. Spighi, P. Temnikov, S. Tessaro, F. Tosello, V. Tretyak, G. L. Usai, S. Vecchi, L. Venturelli, M. Villa, A. Vitale, A. Zenoni, A. Zoccoli

Research output: Contribution to journalArticlepeer-review

Abstract

We report stopping powers of hydrogen and helium for antiprotons of kinetic energies ranging from about 0.5 keV to 1.1 MeV. The Barkas effect, i.e., a difference in the stopping power for antiprotons and protons of the same energy in the same material, shows up clearly in either of the gases. Moreover, below 0.5 keV there is indirect evidence for an increase of the antiproton stopping power. This "nuclear" effect, i.e., energy losses in quasimolecular interactions, shows up in fair agreement with theoretical predictions.

Original languageEnglish
Pages (from-to)371-374
Number of pages4
JournalPhysical Review Letters
Volume74
Issue number3
DOIs
Publication statusPublished - 1995
Externally publishedYes

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