The 0 annihilation at rest in a NTp (4)He-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. (C) 2002 Elsevier Science B.V. All rights reserved.
Single and multinucleon antiproton - (4)He annihilation at rest
Cicalo C;DE FALCO, ALESSANDRO;USAI, GIANLUCA;
2002-01-01
Abstract
The 0 annihilation at rest in a NTp (4)He-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. (C) 2002 Elsevier Science B.V. All rights reserved.
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