Forward K+ Production In Subthreshold Pa Collisions At 1.0 Gev

V. Koptev,M. Buscher,H. Junghans,M. Nekipelov,K. Sistemich,H. Stroher,V. Abaev,H.-H. Adam,R. Baldauf,S. Barsov,U. Bechstedt,N. Bongers,G. Borchert,W. Borgs,W. Brautigam,W. Cassing,V. Chernyshev,B. Chiladze,M. Debowski,J. Dietrich,M. Drochner,S. Dymov, J. Ernst,W. Erven,R. Esser,P. Fedorets,A. Franzen,D. Gotta,T. Grande,D. Grzonka,G. Hansen,M. Hartmann,V. Hejny,L. Jarczyk,A. Kacharava,B. Kamys,A. Khoukaz, T. Kirchner,S. Kistryn,F. Klehr,H. R. Koch,V. Komarov,S. Kopyto,R. Krause,P. Kravtsov,V. Kruglov,P. Kulessa,A. Kulikov,V. Kurbatov,N. Lang,N. Langenhagen,I. Lehmann,A. Lepges,J. Ley,B. Lorentz,G. Macharashvili,R. Maier,S. Martin,S. Merzliakov,K. Meyer,S. Mikirtychiants,H. Muller,P. Munhofen,A. Mussgiller,V. Nelyubin,M. Nioradze,H. Ohm,A. Petrus,D. Prasuhn,B. Prietzschk,H. J. Probst,D. Protic,K. Pysz,F. Rathmann,B. Rimarzig,Z. Rudy, R. Santo,H. Paetz,R. Schleichert,A. Schneider,H. Schneider,G. Schug,O. W. B. Schult,H. Seyfarth,A. Sibirtsev,J. Smyrski,H. Stechemesser,E. Steffens,H. J. Stein,A. Strzalkowski,K.-H. Watzlawik, C. Wilkin,P. Wustner,S. Yashenko,B. Zalikhanov,N. Zhuravlev,P. Zolnierczuk, K. Zwoll,I. Zychor,K. Zwoll, I. Zychor

PHYSICAL REVIEW LETTERS（2001）

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摘要

K+-meson production in pA (A = C, Cu, Au) collisions has been studied using the ANKE spectrometer at an internal target position of the COSY-Julich accelerator. The complete momentum spectrum of kaons emitted at forward angles, theta less than or equal to 12 degrees, has been measured for a beam energy of T-p = 1.0 GeV, far below the free NN threshold of 1.58 GeV. The spectrum does not follow a thermal distribution at low kaon momenta and the larger moments reflect a high degree of collectivity in the target nucleus.

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spectrum,elementary particles

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