Charged pion spectra and energy transfer following antiproton annihilation at rest in carbon and uranium

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Spectra of protons with momenta greater than 500 MeV/c following antiproton annihilation at rest in carbon and uranium nuclei have been measured. They are compared to recent results from other experiments and to predictions of an intranuclear cascade model. Evidence is presented for a substantial B > 0 component in the annihilation process, and an estimate of the magnitude of that component is made.

Section: Introductionmentioning

confidence: 91%

Multinucleon phenomena and proton spectra characterizing antiproton annihilation at rest in nuclei

Minor

Armstrong

Chen

et al. 1992

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“…In Table 2 we show deuteron yields up to 350 MeV for ffa2C and/5238U annihilation. Yields are studied for two deuteron energy regions in order to compare the experimental data of Hofmann et al [123, and present results [11], with model predictions.…”

Section: Coalescence Deuteronsmentioning

confidence: 99%

“…The deuteron data discussed in this paper above 120 MeV deuteron kinetic energy have been reported previously [11]. A cut of mass > 1580 MeV was made to isolate the deuteron signal.…”

Section: Introductionmentioning

confidence: 98%

Fast deuteron production from antiproton annihilation at rest on carbon and uranium targets

Sibirtsev

Armstrong

Lam

et al. 1994

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Abstract. Deuteron yields from 20-350 MeV kinetic energy in antiproton annihilation at rest in 12C and 238U targets are compared with a coalescence model calculation. Agreement of the data with the model up to approximately 80 MeV is good. However, from 80 to 350 MeV the model increasingly underestimates the yield, by as much as on order of magnitude. These results, along with previously reported failures to explain proton spectra with first order rescattering of pions, suggest that other mechanisms are manifest in relatively rare, high energy light nucleus emission, e.g. B > 0 annihilations or possible six quark interactions.

“…Most standard cascade models operate the uniform nuclear nucleon motion inside the Fermi sphere only. The standard cascade calculation of antiproton annihilation on nuclei allowed reproduction of the experimental results on absolute pion and proton yields but was unable to describe the spectra with high accuracy [8,9].…”

Section: Introductionmentioning

confidence: 99%

Pion and fast proton production in $$\bar p$$ A annihilation at rest

Sibirtsev

1993

Abstract. We consider annihilation pions scattering and absorption inside the nucleus to analyse fast proton production in/SA annihilation. The method suggested allows description of both pion and proton spectra, particularly high energy proton tail. New experimental data obtained at LEAR are analysed and we have found an extraordinary behaviour of pion scattering and absorption probabilities depending on atomic number.