Showing papers by "Chary Rangacharyulu published in 2020"
Osaka University1, Tohoku University2, Kyoto Sangyo University3, Korea University4, Academia Sinica5, Kyoto University6, Nanjing University of Aeronautics and Astronautics7, Ohio University8, Thomas Jefferson National Accelerator Facility9, Nihon University10, University of Tokyo11, Gifu University12, Vietnam National University, Ho Chi Minh City13, KEK14, University of Saskatchewan15, Japan Atomic Energy Agency16
TL;DR: The results indicate a small branching fraction of the η'N→ηN process and/or a shallow η^{'}-nucleus potential, which is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η{'} production rate.
Abstract: We measured missing mass spectrum of the ^{12}C(γ,p) reaction for the first time in coincidence with potential decay products from η^{'} bound nuclei. We tagged an (η+p) pair associated with the η^{'}N→ηN process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle cosθ_{lab}^{ηp}<-0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η^{'} production rate. Our results indicate a small branching fraction of the η^{'}N→ηN process and/or a shallow η^{'}-nucleus potential.
10 citations