Journal Article

PreJuSER-57732

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Precision Study of the Eta3He System Using the dp->3HeEta Reaction

Mersmann, T. ; Khoukaz, A. ; Büscher, M.FZJ* ; Chiladze, D.FZJ* ; Dymov, S. ; Hartmann, M.FZJ* ; Hejny, V.FZJ* ; Kacharava, A. ; Keshelashvili, I.FZJ* ; Kulessa, P. ; Maeda, Y. ; Mielke, M. ; Mikirtychiants, S. ; Ohm, H.FZJ* ; Papenbrock, M. ; Prasuhn, D.FZJ* ; Rathmann, F.FZJ* ; Rausmann, T. ; Schleichert, R.FZJ* ; Serdyuk, V. ; Stein, H.-J.FZJ* ; Ströher, H.FZJ* ; Täschner, A. ; Valdau, Y. ; Wilkin, C.FZJ* ; Wronska, A.

2007
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7714  doi:10.1103/PhysRevLett.98.242301

Abstract: The differential and total cross sections for the dp -> He-3 eta reaction have been measured in a high precision high statistics COSY-ANKE experiment near threshold using a continuous beam energy ramp up to an excess energy Q of 11.3 MeV with essentially 100% acceptance. The kinematics allowed the mean value of Q to be determined to about 9 keV. Evidence is found for the effects of higher partial waves for Q greater than or similar to 4 MeV. The very rapid rise of the total cross section to its maximum value within 0.5 MeV of threshold implies a very large eta He-3 scattering length and hence the presence of a quasibound state extremely close to threshold.

Keyword(s): p deuteron: exclusive reaction ; eta: hadroproduction ; helium: nuclide ; threshold ; channel cross section: energy dependence ; mass spectrum: missing-mass ; angular dependence ; asymmetry: momentum dependence ; partial wave ; eta nucleus: scattering length ; magnetic spectrometer: experimental results ; Juelich COSY PS ; deuteron p --> helium-3 eta

Note: Record converted from VDB: 12.11.2012; 4 pages, 4 figures, 1 table, submitted to Phys. Rev. Lett

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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)

Research Program(s):

1. Physik der Hadronen und Kerne (P53)

Appears in the scientific report 2007

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