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25 April 2024

» arxiv » nucl-ex/0603023

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Study of the 3He-eta system in d-p collisions at COSY-11
J. Smyrski ; H.-H. Adam ; A. Budzanowski ; E. Czerwinski ; R. Czyzykiewicz ; D. Gil ; D. Grzonka ; A. Heczko ; M. Janusz ; L. Jarczyk ; B. Kamys ; A. Khoukaz ; K. Kilian ; P. Klaja ; J. Majewski ; P. Moskal ; W. Oelert ; C. Piskor-Ignatowicz ; J. Przerwa ; J. Ritman ; T. Rozek ; R. Santo ; T. Sefzick ; M. Siemaszko ; A. Taeschner ; P. Winter ; M. Wolke ; P. Wuestner ; Z. Zhang ; W. Zipper ;
Date:	23 Mar 2006
Abstract:	We present preliminary results from dp --> 3He X (X=pi0,eta) measurements near the eta production threshold. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target. The 3He ejectiles were registered with the COSY-11 detection setup. The ongoing data analysis should deliver high precision data for the dp --> 3He eta total and differential cross sections for the excess energies in the range from threshold up to 9 MeV. The preliminary excitation function for the reaction dp --> 3He pi0 does not show any structure which could originate from the decay of 3He-eta bound state. We present also a threshold excitation curve for the dp --> 3He X channel. Contrary to corresponding results from SATURNE we see no cusp in the vicinity of the eta threshold.
Source:	arXiv, nucl-ex/0603023
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