Multiplicity of charged secondaries emitted in association with neutral strange particles in antiproton nucleus collisions at 40-GeV/c.

Akhobadze, K.G. ; Grigalashvili, T.S. ; Chikovani, L.D. ; et al.
Phys.Atom.Nucl. 63 (2000) 834-838, 2000.
Inspire Record 533010 DOI 10.17182/hepdata.31228

In collisions of 40-GeV/c antiprotons with D, Li, C, S, Cu, and Pb nuclei, mean multiplicities of various secondary particles are investigated as functions of the mass number A. The mass-number dependence of the mean multiplicities of positively charged particles suggests that the effect of intranuclear cascades is strong for the emission of Λ hyperons, but that it is relatively weak for the emission of either K 0 or \(\bar \Lambda \). Also measured are the yields of various neutral strange particles with respect to those of charged secondaries.

24 data tables

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Experimental study of the annihilation of anti-protons at rest in nuclear photoemulsion and the optical cascade approach

Batusov, Yu.A. ; Bunyatov, S.A. ; Falomkin, I.V. ; et al.
JINR-E1-90-486, 1990.
Inspire Record 303148 DOI 10.17182/hepdata.39437

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1 data table

ANTIPROTONS STOPPING IN THE PHOTOEMULSION.


Anti-proton - Neon Annihilation at Rest and at 607-{MeV}/$c$

Balestra, F. ; Bossolasco, S. ; Bussa, M.P. ; et al.
Nucl.Phys.A 491 (1989) 541-571, 1989.
Inspire Record 263202 DOI 10.17182/hepdata.37004

The analysis is based upon p̄Ne annihilation events at rest and at 607 MeV/c detected with a self-shunted streamer chamber exposed to the LEAR beams. The main measured quantities are the following: charged-prong multiplicity, negative pion multiplicity; momentum, angular and rapidity distributions. General distributions are given as well as distributions as functions of charged prong multiplicity. A correlation is found between high multiplicity and depth of the annihilation point. The data are compared with recent theoretical analyses.

4 data tables

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Strangeness production in anti-proton annihilation at rest on He-3, He-4 and Ne-20

Balestra, F. ; Batusov, Yu.A. ; Bendiscioli, G. ; et al.
Nucl.Phys.A 526 (1991) 415-452, 1991.
Inspire Record 320088 DOI 10.17182/hepdata.36782

New data are reported on antiproton annihilations at rest with production of Λ and K s 0 , using a streamer chamber with 3 He, 4 He and 20 Ne as gas targets. The data include Λ, K s 0 , ΛK s 0 and K s 0 K S 0 production rates and momentum distributions, π − momentum spectra, mean numbers of charged particles generally and of negatively charged particles separately for different reaction channels. The yields are compared to simple combinatorial calculations based on the extreme assumptions of Λ production via B = 1 or via B = 0 ( K ̄ rescattering) annihilations. Λ and K s 0 momentum spectra are compared to simple model calculations where B = 0 and B = 1 annihilations with and without final-state interactions are considered. A review of existing data on Λ and K s 0 production is presented, showing the dependence on the p ̄ momentum and on the mass number of the target.

6 data tables

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Production of neutral strange particles in p Ar, p Xe and anti-p Xe collisions at 200-GeV

Derado, I. ; Kadija, K. ; Malecki, M. ; et al.
Z.Phys.C 50 (1991) 31-36, 1991.
Inspire Record 28958 DOI 10.17182/hepdata.15007

The production of neutral strange particles (K0, Λ) inp Ar,pXe and\(\bar p\)Xe collisions at 200 GeV is investigated in the NA5 experiment using a streamer chamber at the CERN SPS. Results are presented on inclusive cross sections, average multiplicities, and on rapidity and transverse momentum distributions of neutral strange particles.

23 data tables

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Neutral Strange Particle Productions and Inelastic Cross-section in $\bar{p}$ Ta Reaction at 4-{GeV}/$c$

Miyano, K. ; Noguchi, Y. ; Yoshimura, Y. ; et al.
Phys.Rev.C 38 (1988) 2788-2798, 1988.
Inspire Record 261403 DOI 10.17182/hepdata.26211

The inclusive production of Ks0, Λ, Λ¯, and Ks0Λ in the p¯Ta reaction at 4 GeV/c was measured and compared with that in the p¯p reaction. The total inelastic and topological cross sections were also measured. The number of Λ’s produced in the p¯Ta reaction was 11.3 times larger than that expected from the geometrical cross section, which is defined as A2/3 times the cross section for the p¯p reaction. The yield ratio Λ¯/Λ was found to be 2×10−2. These values cannot be accounted for by a straightforward extension of the p¯N reaction. Besides, a correlation of 2 vees like Ks0-Λ could not prove their simultaneous production. Nuclear temperatures of 135 and 97 MeV were obtained from the kinetic energy spectra of Ks0 and Λ, respectively. The kinematical characteristics of the Ks0 and Λ produced were analyzed in terms of the fireball model.

34 data tables

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CORRELATION AMONG CHARGED SECONDARY PARTICLES IN INTERACTIONS OF ANTI-NUCLEONS WITH TANTALUM NUCLEI AT A MOMENTUM OF 6.1-GEV/C

Andreev, V.F. ; Baranov, P.S. ; Levonian, S.V. ; et al.
JETP Lett. 45 (1987) 662-664, 1987.
Inspire Record 256457 DOI 10.17182/hepdata.16900

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2 data tables

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CHARGED PARTICLE MULTIPLICITIES IN PI-, K- AND ANTI-P INTERACTIONS WITH NUCLEI AT 40-GEV/C

The RISK collaboration Boos, E.G. ; Mosienko, A.M. ; Pokrovsky, N.A. ; et al.
Z.Phys.C 26 (1984) 43-52, 1984.
Inspire Record 214970 DOI 10.17182/hepdata.22350

Interactions of 40 GeV/c πp-,K− and\(\bar p\) on Li, C, S, Cu, CsI and Pb were studied with the RISK-streamer chamber spectrometer. We present multiplicities of negatively charged particles, as well as of protons, and the correlations between them. The normalized mean multiplicity of negative particles,R−, depends on\(\bar v\), the average number of inelastic collisions as\(R^ -= (0.73 \pm 0.04) + (0.34 \pm 0.02)\bar v\). The dependence of the normalized dispersion of negative particles,D−/<N−>, on the number of protons favours independent collision models and contradicts the coherent tube picture. The excess of fast positive particles behaves asA0.4 and shows, for the heavier nuclei, a clear correlation with identified protons.

2 data tables

AVERAGE MULTIPLICITIES OF ALL CHARGED PARTICLES.

AVERAGE MULTIPLICITIES OF ALL NEGATIVELY CHARGED PARTICLES.


Multiparticle Production on Hydrogen, Argon and Xenon Targets in a Streamer Chamber by 200-GeV/c Proton and anti-Proton Beams

The Bari-Cracow-Liverpool-Munich-Nijmegen collaboration De Marzo, C. ; De Palma, M. ; Distante, A. ; et al.
Phys.Rev.D 26 (1982) 1019, 1982.
Inspire Record 177100 DOI 10.17182/hepdata.4113

Interactions of 200-GeV/c protons and antiprotons on hydrogen, argon, and xenon targets were studied with a streamer-chamber vertex spectrometer at the CERN SPS. Results on multiplicities, rapidity distributions, and correlations are presented and compared with predictions of current models.

10 data tables

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'PRODUCED PARTICLES' (SEE CONDITIONS).

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MEASUREMENT OF THE AVERAGE TRANSVERSE MOMENTUM AND OF THE PION EMISSION VOLUME IN PROTON NUCLEUS AND ANTI-PROTON NUCLEUS REACTIONS AT 200-GEV

De Marzo, C. ; De Palma, M. ; Distante, A. ; et al.
Phys.Rev.D 29 (1984) 363-367, 1984.
Inspire Record 202202 DOI 10.17182/hepdata.23727

We have measured 〈p⊥〉 as a function of multiplicity for the reaction proton (antiproton) on proton, neon, argon, and xenon. For all reactions, 〈p⊥〉 is independent of multiplicity. We observed that the pion-emission volume is the same for both hydrogen and xenon targets and has a radius about 1.5 fm. Our analysis shows no indication of a deconfinement phase transition in nuclear matter.

1 data table

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