Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 98: Experimentelle Methoden III
T 98.2: Group Report
Thursday, March 3, 2016, 17:05–17:25, VMP8 SR 105
The MuSun experiment: muon capture on the deuteron — •Frederik Wauters1,2, Peter Kammel2, Claude Petitjean3, Alexander Vasilyev4, Rachel Ryan2, Daniel Salvat2, Ethan Muldoon2, Michael Murray2, David Hertzog2, Robert Carrey5, Frederick Gray6, and Tim Gorringe7 — 1Johannes Gutenberg University of Mainz, Mainz, Deutschland — 2University of Washington, Seattle, USA — 3Paul Scherrer Institute, Villigen, Switzerland — 4Petersburg Nuclear Physics Institute , Gatchina, Russia — 5Boston University, Boston, USA — 6Regis University, Denver, USA — 7University of Kentuky, Lexington. USA
The MuSun experiment measures the muon capture rate on the deuteron via a precise measurement of the lifetime of negative muons in deuterium, determining unambiguously the low energy constant (LEC) related to the strengths of the axial coupling to the two nucleon-system. LEC's are part of recently developed QCD-based effective field theories, which provide a first-principles description with predictive power for few-body nuclear systems. A quantitative relationship is established between astrophysical processes which cross sections can not be measured in the laboratory, such as the pp fusion in our sun, and muon capture rates. The MuSun experiment finished data taking at the Paul Scherrer Institute (Villigen, CH) in the summer of 2015. In this talk, I will present the experimental program of the last 4 years and the progress of the data analysis towards a first physics result. I will focus on our active-target time projection chamber, which provides the event selection for the 10 ppm lifetime analysis.