The <(p)over bar p> total annihilation cross section has been measured, with the Obelix apparatus at LEAR, at ten values of the antiproton incident momentum between 43 and 175 MeV/c. The values of the cross section show that the well known 1/p behaviour of the annihilation cross section is drastically modified at very low momenta, which demonstrates the important role of the Coulomb force in low energy <(p)over bar p> interaction. Moreover, they do not present any explicit resonant behaviour. Finally, when compared to potential model calculations, the data suggest that the percentage of P-wave in <(p)over bar p> interaction around 50 MeV/c antiproton incident momentum is less than 5%.

(p)over-bar-p annihilation cross section at very low energy

COSTA, Sergio;BALESTRA, Ferruccio;BOTTA, Elena;BRESSANI, Tullio;BUSSA, Maria Pia;BUSSO, Luigi;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;MARCELLO, Simonetta;PANZIERI, Daniele;
1996-01-01

Abstract

The <(p)over bar p> total annihilation cross section has been measured, with the Obelix apparatus at LEAR, at ten values of the antiproton incident momentum between 43 and 175 MeV/c. The values of the cross section show that the well known 1/p behaviour of the annihilation cross section is drastically modified at very low momenta, which demonstrates the important role of the Coulomb force in low energy <(p)over bar p> interaction. Moreover, they do not present any explicit resonant behaviour. Finally, when compared to potential model calculations, the data suggest that the percentage of P-wave in <(p)over bar p> interaction around 50 MeV/c antiproton incident momentum is less than 5%.
1996
369
77
85
A. Bertin;M. Bruschi;M. Capponi;B. Cereda;S. DeCastro;A. Ferretti;D. Galli;B. Giacobbe;U. Marconi;M. Piccinini;N. S. Cesari;R. Spighi;S. Vecchi;A. Vezzani;M. Villa;A. Vitale;A. Zoccoli;G. Belli;M. Corradini;A. Donzella;E. L. Rizzini;L. Venturelli;A. Zenoni;C. Cicalo;A. Masoni;G. Puddu;S. Serci;P. Temnikov;G. Usai;S. Costa;V. G. Ableev;O. Y. Denisov;O. E. Gorchakov;S. N. Prakhov;A. M. Rozhdestvensky;M. G. Sapozhnikov;V. I. Tretyak;P. Gianotti;C. Guaraldo;A. Lanaro;V. Lucherini;F. Nichitiu;C. Petrascu;A. Rosca;C. Cavion;U. Gastaldi;M. Lombardi;L. Vannucci;G. Vedovato;A. Andrighetto;M. Morando;R. A. Ricci;G. Bendiscioli;V. Filippini;A. Fontana;P. Montagna;A. Rotondi;A. Saino;P. Salvini;A. Filippi;F. Balestra;E. Botta;T. Bressani;M. P. Bussa;L. Busso;D. Calvo;P. Cerello;F. DIsep;L. Fava;A. Feliciello;L. Ferrero;R. Garfagnini;A. Grasso;A. Maggiora;S. Marcello;N. Mirfakhraee;D. Panzieri;D. Parena;E. Rossetto;F. Tosello;M. Agnello;F. Iazzi;B. Minetti;G. Pauli;S. Tessaro;L. Santi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/105981
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