Photoproduction of eta mesic He-3
Dec, 2003Citations per year
Abstract:
The photoproduction of eta-mesic 3He has been investigated using the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI. The total inclusive cross section for the reaction gamma+3He->eta+X has been measured for photon energies from threshold to 820 MeV. The total and angular differential coherent eta cross sections have been extracted up to energies of 745 MeV. A resonance-like structure just above the eta production threshold with an isotropic angular distribution suggests the existence of a resonant quasi-bound state. This is supported by studies of a competing decay channel of such a quasi-bound eta-mesic nucleus into pi^0+p+X. A binding energy of (-4.4+-4.2) MeV and a width of (25.6+-6.1) MeV is deduced for the quasi-bound eta-mesic state in 3He.Note:
- v1: 4 pages, 4 figures, submitted to PRL: v2: minor revisions and corrections, new figure added, 4 pages, 5 figs: v3: minor changes Journal-ref: Phys.Rev.Lett. 92 (2004) 252001
- 13.60.Le
- 14.40.Aq
- 36.10.Gv
- 14.20.Gk
- photon nucleus: inclusive reaction
- photon nucleus: nuclear reaction
- helium: nuclide
- eta: photoproduction
- channel cross section
- angular distribution
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