Antiproton He-3 annihilation events at rest have been detected using a self-shunted streamer chamber. The ratio of the cross section for annihilation on neutrons and on protons has been measured (0.467 +- 0.035). It is compared with other results from annihilation on free nucleons, deuterium, He-3 and He-4. The low value of the ratio seems to indicate a strong isospin dependence of the antinucleon-nucleon P-wave amplitude.
Evidence of Isospin Effects In Antiproton Nucleus Annihilation
BALESTRA, Ferruccio;BUSSA, Maria Pia;BUSSO, Luigi;FERRERO, Livio;PANZIERI, Daniele;PIRAGINO, Guido;
1989-01-01
Abstract
Antiproton He-3 annihilation events at rest have been detected using a self-shunted streamer chamber. The ratio of the cross section for annihilation on neutrons and on protons has been measured (0.467 +- 0.035). It is compared with other results from annihilation on free nucleons, deuterium, He-3 and He-4. The low value of the ratio seems to indicate a strong isospin dependence of the antinucleon-nucleon P-wave amplitude.
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