What are accretion disks around black holes?

Oct 12, 2017 ... 596 votes, 39 comments. 3.2M subscribers in the Physics community. For physicists and physics students. See the rules before posting, ... Feb 25, 2020 ... I'm interested in the decay of the first excited state of Zr-90. It is the source of the tiny positron branch in the decay of Y-90 and can be used for PET ... Jan 29, 2019 ... ... acceptance for electrons and positrons, the positron flux, Φe+ Φ e + , is more sensitive to new physics phenomena than the positron fraction, Φ ... Chemical Physics Letters 2003, 369 (5-6) , 513-518. https://doi.org/10.1016/S0009-2614(02)01989-9. Subir Kumar Das, B.Nandi Ganguly. Guest molecules in ... The Atomic, Molecular, Optical and Positron Physics (AMOPP) group explores many different topics and has both experimental and theoretical research programs in ... Nov 4, 2019 ... It also includes a top-quark pair production threshold scan around 350 GeV which provides a precise measurement of the top-quark mass in a well- ... Sep 27, 2023 ... Positrons are unique probes of matter with important applications in medical imaging (positron ... Positrons in surface physics. Surf Sci Rep ( ... The positron or antielectron is the particle with an electric charge of +1e, a spin of 1/2 and the same mass as an electron. It is the antiparticle ... Aug 2, 2016 ... Positron discovered ... On this day in 1932, Caltech physicist Carl Anderson discovered the positron, the first particle of antimatter to be ... High Energy Electron-Positron Physics ... With the termination of the physics program at PETRA, and with the start of TRISTAN and the SLC and later LEP, an era of ...