Deep Subthreshold XI{sup -} Production in Ar+KCl Reactions at 1.76A GeV

Journal Article · Fri Sep 25 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.132301· OSTI ID:21370691

Agakishiev, G; Destefanis, M; Gilardi, C; Kirschner, D; Kuehn, W; Lange, J S; Metag, V; Mishra, D; Pechenova, O; Spataro, S; Spruck, B ^[1]; Balanda, A; Dybczak, A; Michalska, B; Otwinowski, J; Przygoda, W; Salabura, P; Trebacz, R; Wisniowski, M; Wojcik, T ^[2]

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1. II.Physikalisches Institut, Justus Liebig Universitaet Giessen, 35392 Giessen (Germany)
2. Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Krakow (Poland)

We report first results on a deep subthreshold production of the doubly strange hyperon XI{sup -} in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer at SIS18/GSI. A high-statistics and high-purity LAMBDA sample was collected, allowing for the investigation of the decay channel XI{sup -}->LAMBDApi{sup -}. The deduced XI{sup -}/(LAMBDA+SIGMA{sup 0}) production ratio of (5.6+-1.2{sub -1.7}{sup +1.8})x10{sup -3} is significantly larger than available model predictions.

• OSTI ID: 21370691
• Journal Information: Physical Review Letters, Vol. 103, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.103.132301; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ELECTRON SPECTROMETERS
GEV RANGE 01-10
HEAVY ION REACTIONS
PARTICLE DECAY
PARTICLE PRODUCTION
POTASSIUM CHLORIDES
SIGMA NEUTRAL PARTICLES
XI MINUS PARTICLES
ALKALI METAL COMPOUNDS
BARYONS
CHLORIDES
CHLORINE COMPOUNDS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
HADRONS
HALIDES
HALOGEN COMPOUNDS
HYPERONS
MEASURING INSTRUMENTS
NUCLEAR REACTIONS
POTASSIUM COMPOUNDS
SIGMA BARYONS
SIGMA PARTICLES
SPECTROMETERS
STRANGE PARTICLES
XI BARYONS
XI PARTICLES