Photoproduction of η-mesic ³He

Pfeiffer, M. and Ahrens, J. and Annand, J. R. M. and Beck, R. and Caselotti, G. and Cherepnya, S. and Fohl, K. and Fog, L. S. and Hornidge, D. and Janssen, S. and Kashevarov, V. and Kondratiev, R. and Kotulla, M. and Krusche, B. and McGeorge, J. C. and MacGregor, I. J. D. and Mengel, K. and Messchendorp, J. G. and Metag, V. and Novotny, R. and Rost, M. and Sack, S. and Sanderson, R. and Schadmand, S. and Thomas, A. and Watts, D. P.. (2004) Photoproduction of η-mesic ³He. Physical review letters, Vol. 92, H. 25 , 252001, 4 S..

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Official URL: http://edoc.unibas.ch/dok/A5261946

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The photoproduction of eta-mesic He-3 has been investigated using the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI. The total inclusive cross section for the reaction gamma(3)He-<etaX 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 resonancelike structure just above the eta 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 eta-mesic nucleus into pi(0)pX. A binding energy of (-4.4+/-4.2) MeV and a width of (25.6+/-6.1) MeV is deduced for the quasibound eta-mesic state in He-3.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Variant title: Photoproduction of eta-mesic He-3 -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:53

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