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27 April 2024

» arxiv » nucl-ex/0312011

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Photoproduction of eta-mesic 3He
M. Pfeiffer ; J. Ahrens ; J.R.M. Annand ; R. Beck ; G. Caselotti ; S. Cherepnya ; K. Föhl ; L.S. Fog ; D. Hornidge ; S. Janssen ; V. Kashevarov ; R. Kondratiev ; M. Kotulla ; B. Krusche ; J.C. McGeorge ; I.J.D. MacGregor ; K. Mengel ; J.G. Messchendorp ; V. Metag ; R. Novotny ; M. Rost ; S. Sack ; R. Sanderson ; S. Schadmand ; A. Thomas ; D.P. Watts ;
Date:	11 Dec 2003
Journal:	Phys.Rev.Lett. 92 (2004) 252001
Subject:	nucl-ex
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.
Source:	arXiv, nucl-ex/0312011
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