Phys. Rev. Lett. 92, 252001 (2004) [4 pages]Photoproduction of η-Mesic 3HeReceived 11 December 2003; published 24 June 2004 The photoproduction of η-mesic 3He has been investigated using the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI. The total inclusive cross section for the reaction γ3He→ηX has been measured for photon energies from threshold to 820 MeV. The total and angular differential coherent η cross sections have been extracted up to energies of 745 MeV. A resonancelike structure just above the η production threshold with an isotropic angular distribution suggests the existence of a resonant quasibound state. This is supported by studies of a competing decay channel of such a quasibound η-mesic nucleus into π0pX. A binding energy of (-4.4±4.2) MeV and a width of (25.6±6.1) MeV is deduced for the quasibound η-mesic state in 3He. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.252001
DOI:
10.1103/PhysRevLett.92.252001
PACS:
13.60.Le, 14.20.Gk, 14.40.Aq, 36.10.Gv
See AlsoComment: C. Hanhart, Comment on “Photoproduction of η-Mesic 3He”, Phys. Rev. Lett. 94, 049101 (2005). Reply: M. Pfeiffer et al., Pfeiffer et al. Reply:, Phys. Rev. Lett. 94, 049102 (2005). |
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