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Evidence for a narrow structure at W∼1.68 GeV in η photoproduction off the neutron
Kuznetsov, V.,Churikova, S.,Gervino, G.,Ghio, F.,Girolami, B.,Ivanov, D.,Jang, J.,Kim, A.,Kim, W.,Ni, A.,Vorobiev, Yu.,Yurov, M.,Zabrodin, A. North-Holland Pub. Co 2007 Physics letters: B Vol.647 No.1
New results on quasi-free η photoproduction on the neutron and proton bound in a deuteron target are presented. The γn->ηn quasi-free cross section reveals a bump-like structure which is not seen in the cross section on the proton. This structure may signal the existence of a relatively narrow (M∼1.68 GeV, Γ=<30 MeV) baryon state.
First Test of the CTOF@CLAS12 Detector Counter with Proton Beams
니안드레이,V. Kuznetsov,S. Chebotarev,H. Dho,A. Kim,김우영,E. Milman,M. Lee,T. Yang 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
CTOF@CLAS12 plastic scintillator counter was tested with proton beam at Korea Institute of Radiological and Medical Sciences (KIRAMS). The counter have been designed and constructed as a plastic scintillation bar coupled with the 1.5 and the 2 inches of diameter fine mesh photomultiplier tubes (FM-PMTs). The dependence of the TOF resolution on the light output has dened. Obtained results of the 1.5'', 2'' FM-PMTs' timing and gain performances in magnetic eld confirm their suitability for precise particle identification in the CLAS12 future detector.