Journalartikel

Jahr der Veröffentlichung: 2004

Zeitschrift: Physical Review Letters

Bandnummer: 92

Heftnummer: 25

ISSN: 0031-9007

eISSN: 1079-7114

Open Access Status: Green

DOI Link: https://doi.org/10.1103/PhysRevLett.92.252001

Verlag: American Physical Society

Abstract: 
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.

Harvard-Zitierstil: Pfeiffer, M., Ahrens, J., Annand, J., Beck, R., Caselotti, G., Cherepnya, S., et al. (2004) Photoproduction of η-mesic ³He -: art. no. 252001, Physical Review Letters, 92(25), Article 252001. https://doi.org/10.1103/PhysRevLett.92.252001

APA-Zitierstil: Pfeiffer, M., Ahrens, J., Annand, J., Beck, R., Caselotti, G., Cherepnya, S., Föhl, K., Fog, L., Hornidge, D., Janssen, S., Kashevarov, V., Kondratiev, R., Kotulla, M., Krusche, B., McGeorge, J., MacGregor, I., Mengel, K., Messchendorp, J., Metag, V., ...Watts, D. (2004). Photoproduction of η-mesic ³He -: art. no. 252001. Physical Review Letters. 92(25), Article 252001. https://doi.org/10.1103/PhysRevLett.92.252001