Proton-antiproton annihilations at rest into π0ω, π0η, π0γ, π0π0, and π0η′
G. Backenstoss,M. Hasinoff,P. Pavlopoulos,J. Repond,L. Tauscher,D. Tröster,P. Blüm,R. Guigas,H. Koch,M. Meyer,H. Poth,U. Raich,B. Richter,L. Adiels,I. Bergström,Kjell Fransson,Andras Kerek,M. Suffert,Konstantin Zioutas +18 more
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TLDR
In this article, the high-energy part of the spectrum was used to deduce branching ratios for the so far unobserved annihilation channels: R(p p →π 0 ω) = (2.38 ± 0.65)%, R( p p → π 0 η ) = (0.82 ± 0.04)% and an upper limit for the π0η′ channel was deduced.About:
This article is published in Nuclear Physics.The article was published on 1983-12-05 and is currently open access. It has received 48 citations till now.read more
Citations
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The antinucleon-nucleon interaction at low energy: annihilation dynamics
TL;DR: In this paper, the general properties of antiproton-proton annihilation at rest are presented, with special focus on the two-meson final states, and the data exhibit remarkable dynamical selection rules: some allowed annihilation modes are suppressed by one order of magnitude with respect to modes of comparable phase-space.
Journal ArticleDOI
Antibaryons bound in nuclei
I. N. Mishustin,I. N. Mishustin,L. M. Satarov,L. M. Satarov,T. J. Bürvenich,T. J. Bürvenich,Horst Stöcker,Walter Greiner +7 more
TL;DR: In this article, the authors studied the possibility of producing a new kind of nuclear system that in addition to ordinary nucleons contains a few antibaryons (B{sup -}=p{sup-},{lambda}{sup -}, etc.).
Journal ArticleDOI
Antiproton-proton annihilation at rest into two-body final states
Claude Amsler,D. S. Armstrong,I. Augustin,C.A. Baker,B. M. Barnett,C. J. Batty,K. Beuchert,P. Birien,James A. Bistirlich,P. Blüm,R. Bossingham,H. Bossy,K. Braune,J. Brose,D.V. Bugg,Mark J. Burchell,T. Case,S. U. Chung,A. Cooper,Kenneth M. Crowe,H. P. Dietz,S. v. Dombrowski,Michael Doser,W. Dünnweber,D. Engelhardt,M. Englert,M. A. Faessler,C. Felix,G. Folger,R. Hackmann,R. P. Haddock,F. H. Heinsius,Nigel Hessey,Pàl Hidas,P. Illinger,D. Jamnik,Z. Jávorfi,H. Kalinowsky,B. Kämmle,T. Kiel,J. Kisiel,Eberhard Klempt,Michael Kobel,Herbert Koch,C. Kolo,K. Königsmann,Marcel Kunze,R. Landua,J. Lüdemann,H. Matthaey,M. Merkel,J. P. Merlo,C. A. Meyer,U. Meyer-Berkhout,L. Montanet,A. Noble,F. Ould-Saada,K. Peters,G. Pinter,S. Ravndal,A. H. Sanjari,E. Schäfer,B. Schmid,P. Schmidt,S. Spanier,C. Straßburger,U. Strohbusch,M. Suffert,D. Urner,C. Völcker,F. Walter,D. Walther,U. Wiedner,N. Winter,J. Zoll,Č. Zupančič +75 more
TL;DR: In this article, the branching ratio of two meson final states at rest in liquid hydrogen has been investigated and the first measurements of branching ratios were made for different η and η′ decays.
Journal ArticleDOI
Low energy antiproton physics in the early LEAR era
Anthony M. Green,J.A. Niskanen +1 more
TL;DR: In this article, a review of developments in the field of low energy antinucleon physics since 1983, the year in which the Low Energy Antiproton Ring opened in CERN, is presented.
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Nucleon-antinucleon annihilation into two pseudoscalar mesons: quark rearrangement versus quark annihilation
TL;DR: In this paper, the interference between planar and rearrangement mechanisms in the quark model for two pseudoscalar annihilation modes of the N N system was investigated, and it was shown that both mechanisms seem to be necessary even to partially understand the data.
References
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MINUIT-a system for function minimization and analysis of the parameter errors and correlations
F. James,Matts Roos +1 more
TL;DR: Title of program: MINUIT gating the shape of the function near the minimum to determine the errors, in this essentially statistical problem the Catalogue number: ACWH function involved is usually a chisquare or negative log-likeli
Journal ArticleDOI
Observation of p ¯ p → 2 π 0 at Rest: Evidence Concerning s-State Annihilation
S. Devons,T. Kozlowski,P. Nemethy,S. Shapiro,N. Horwitz,T. Kalogeropoulos,J. Skelly,R. Smith,H. Uto +8 more
TL;DR: The annihilation mode of antiprotons stopping in liquid hydrogen at a rate which is 0.15 (ifmmode\pm\else\textpm\fi{}20%) times that reported in this article was found to be the annihilation mode from odd-orbital atomic states, in contrast to the usual assumption that annihilation from the $s$ state predominates.
Journal ArticleDOI
Annihilation into pions of the\(\bar p\)n system from antiprotons at rest in deuterium
A. Bettini,M. Cresti,S. Limentani,L. Peruzzo,R. Santangelo,S. Sartori,L. Bertanza,A. Bigi,R. Carrara,R. Casali,P. Lariccia +10 more
TL;DR: In this article, the pionic resonances ρ, ω and f0 were measured and analysed in detail and the rates into the various multipion final states were determined.
Journal ArticleDOI
New results in the search for narrow states in the p system below threshold
B. Richter,L. Adiels,G. Backenstoss,I. Bergström,P. Blüm,Kjell Fransson,M. Glöckner,R. Guigas,M. Hasinoff,Andras Kerek,H. Koch,T. Kohler,M. Meyer,P. Pavlopoulos,H. Poth,U. Raich,J. Repond,M. Suffert,L. Tauscher,D. Tröster,Konstantin Zioutas +20 more
TL;DR: The γ-ray spectrum after p annihilation at rest was measured in two independent high-statistics runs as discussed by the authors, showing narrow peaks corresponding to masses of 1210, 1638, 1694 and 1771 MeV.
Journal Article
A modular NaI(Tl) detector for 20-1000 MeV photons
P. Bluem,R. Guigas,Herbert Koch,M. Meyer,H. Poth,U. Raich,B. Richter,G. Backenstoss,M. Hasinoff,P. Pavlopoulos,J. Repond,L. Tauscher,D. Troester,L. Adiels,I. Bergstroem,K. Fransson,A. Kerek,M. Suffert,Konstantin Zioutas +18 more
TL;DR: In this paper, a detector consisting of 54 NaI (Tl) modules was proposed for the detection of 20-1000 MeV photons, achieving an energy resolution of 5.5% at 130 MeV.
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E. Aker,Claude Amsler,I. Augustin,C. A. Baker,B. M. Barnett,C. J. Batty,R. Beckmann,P. Birien,James A. Bistirlich,P. Blüm,R. Bossingham,H. Bossy,K. Braune,D.V. Bugg,Mark J. Burchell,T. Case,S. Cierjacks,Kenneth M. Crowe,K. Dederichs,Michael Doser,W. Dünnweber,H. Emerich,D. Engelhardt,M. A. Faessler,C. Felix,G. Folger,J.M. Friedrich,R. Hackmann,R. P. Haddock,H. Hammer,F. H. Heinsius,N. P. Hessey,P. Illinger,D. Jamnik,H. Kalinowsky,B. Kämmle,T. Kiel,Eberhard Klempt,H. Koch,C. Kolo,K. Königsmann,F. Krennrich,Marcel Kunze,R. Landua,J. Lüdemann,H. Matthaey,M. Merkel,J. P. Merlo,C. A. Meyer,U. Meyer-Berkhout,L. Montanet,A. Noble,K. Peters,W. Rohrbach,A. H. Sanjari,E. Schäfer,B. Schmid,W. Schott,K. Sidiropoulos,S. Spanier,A. Staude,Chr. Strassburger,U. Strohbusch,M. Suffert,C. Sutton,D. Urner,C. Völcker,D. Walther,S. M. Walther,Ch. Weddigen,U. Wiedner,N. Winter,J. Zoll,Č. Zupančič +73 more