Quasifree photoproduction of eta mesons off the neutron.

Authors :: Jaegle I
Mertens T
Anisovich AV
Bacelar JC
Bantes B
Bartholomy O
Bayadilov D
Beck R
Beloglazov YA
Castelijns R
Crede V
Dutz H
Ehmanns A
Elsner D
Essig K
Ewald R
Fabry I
Fuchs M
Funke Ch
Gothe R
Gregor R
Gridnev AB
Gutz E
Höffgen S
Hoffmeister P
Horn I
Junkersfeld J
Kalinowsky H
Kammer S
Kleber V
Klein F
Klein F
Klempt E
Konrad M
Kotulla M
Krusche B
Lang M
Langheinrich J
Löhner H
Lopatin IV
Lotz J
Lugert S
Menze D
Messchendorp JG
Metag V
Morales C
Nanova M
Nikonov VA
Novinski D
Novotny R
Ostrick M
Pant LM
van Pee H
Pfeiffer M
Radkov A
Roy A
Sarantsev AV
Schadmand S
Schmidt C
Schmieden H
Schoch B
Shende SV
Sokhoyan V
Süle A
Sumachev VV
Szczepanek T
Thoma U
Trnka D
Varma R
Walther D
Weinheimer Ch
Wendel Ch
Source :: Physical review letters [Phys Rev Lett] 2008 Jun 27; Vol. 100 (25), pp. 252002. Date of Electronic Publication: 2008 Jun 26.
Publication Year :: 2008
Abstract: Quasifree photoproduction of eta mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasifree n(gamma,eta)n and p(gamma,eta)p reactions. The excitation function for eta production off the neutron shows a pronounced bumplike structure at W=1.68 GeV (E{gamma} approximately 1 GeV), which is absent for the proton.

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