Antineutron-proton total cross section from 50 to 400 MeV/c

F. Iazzi, A. Feliciello, M. Agnello, M. Astrua, E. Botta, T. Bressani, D. Calvo, S. Costa, F. D'Isep, A. Filippi, S. Marcello, B. Minetti, N. Mirfakhraee, F. Balestra, M. P. Bussa, L. Busso, P. Cerello, O. Denisov, L. Ferrero, R. GarfagniniA. Maggiora, A. Panzarasa, D. Panzieri, F. Tosello, A. Bertin, M. Bruschi, M. Capponi, S. De Castro, R. Donà, D. Galli, B. Giacobbe, U. Marconi, I. Massa, M. Piccinini, M. Poli, N. Semprini Cesari, R. Spighi, V. Vagnoni, S. Vecchi, M. Villa, A. Vitale, A. Zoccoli, A. Bianconi, G. Bonomi, E. Lodi Rizzini, L. Venturelli, A. Zenoni, C. Cicalò, A. Masoni, S. Mauro, G. Puddu, S. Serci, G. Usai, O. E. Gorchakov, S. N. Prakhov, A. M. Rozhdestvensky, V. I. Tretyak, P. Gianotti, C. Guaraldo, A. Lanaro, V. Lucherini, C. Petrascu, M. Lombardi, R. A. Ricci, L. Vannucci, G. Bendiscioli, A. Fontana, P. Montagna, A. Rotondi, P. Salvini, S. Tessaro

Research output: Contribution to journalArticlepeer-review

Abstract

The antineutron-proton total cross section has been measured in the low momentum range 50-400 MeV/c (below 100 MeV/c for the first time). The measurement was performed at LEAR (CERN) by the OBELIX experiment, thanks to its unique antineutron beam facility. A thick target transmission technique has been used. The measured total cross section shows an anomalous behaviour below 100 MeV/c. A dominance of the isospin I=0 channel over the I=1 one at low energy is clearly deduced.

Original languageEnglish
Pages (from-to)378-385
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume475
Issue number3-4
DOIs
Publication statusPublished - 2 Mar 2000
Externally publishedYes

Keywords

  • Antineutron-proton total cross section
  • Isospin 1 system
  • OBELIX spectrometer
  • Quasi-nuclear antinucleon-nucleon states
  • Transmission technique

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