The 0 annihilation at rest in a NTp He-4-gas target has been studied by means of the Obelix spectrometer installed at the LEAR accelerator of CERN. Reactions with production of 2pi(-)2pi(+). 2pi(-)3pi(+), 2pi(-)2pi(+)p, 2pi(-)pi(+)2p, 2pi(-)3p (with p(pi) > 80 MeV/c and p(p) > 300 MeV/c) have been selected and single- and multinucleon annihilations identified. For the first time some known mesonic and baryonic resonances have been observed in (p) over bar (4) He annihilations and branching ratios are evaluated for a number of reaction channels.
Single and multi-nucleon antiproton-4He annihilation at rest
Bussa MP;BALESTRA, Ferruccio;BUSSO, Luigi;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;PANZIERI, Daniele;BOTTA, Elena;BRESSANI, Tullio;MARCELLO, Simonetta;
2002-01-01
Abstract
The 0 annihilation at rest in a NTp He-4-gas target has been studied by means of the Obelix spectrometer installed at the LEAR accelerator of CERN. Reactions with production of 2pi(-)2pi(+). 2pi(-)3pi(+), 2pi(-)2pi(+)p, 2pi(-)pi(+)2p, 2pi(-)3p (with p(pi) > 80 MeV/c and p(p) > 300 MeV/c) have been selected and single- and multinucleon annihilations identified. For the first time some known mesonic and baryonic resonances have been observed in (p) over bar (4) He annihilations and branching ratios are evaluated for a number of reaction channels.
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