Author/Authors :
Ludhova، نويسنده , , L. and Amaro، نويسنده , , F.D. and Antognini، نويسنده , , A. and Biraben، نويسنده , , F. and Cardoso، نويسنده , , J.M.R. and Conde، نويسنده , , C.A.N. and Covita، نويسنده , , D.S. and Dax، نويسنده , , A. K. Dhawan and Tripat Kumar ، نويسنده , , S. and Fernandes، نويسنده , , L.M.P. and Hنnsch، نويسنده , , T.W. and Hughes، نويسنده , , V.-W. and Huot، نويسنده , , O. and Indelicato، نويسنده , , P. and Julien، نويسنده , , L. and Knowles، نويسنده , , P.E. and Kottmann، نويسنده , , F. and Lopes، نويسنده , , J.A.M. and Liu، نويسنده , , Y.-W. and Monteiro، نويسنده , , C.M.B. and Mulhauser، نويسنده , , F. and Nez، نويسنده , , F. and Pohl، نويسنده , , R. and Rabinowitz، نويسنده , , P. and dos Santos، نويسنده , , J.M.F. and Schaller، نويسنده , , L.A. and Taqqu، نويسنده , , D. and Veloso، نويسنده , , J.F.C.A.، نويسنده ,
Abstract :
An experiment measuring the 2S Lamb shift in muonic hydrogen ( μ - p ) was performed at the Paul Scherrer Institute, Switzerland. It required small and compact detectors for 1.9 keV X-rays (2P–1S transition) with an energy resolution around 25% at 2 keV, a time resolution better than 100 ns, a large solid angle coverage, and insensitivity to a 5 T magnetic field. We chose Large Area Avalanche Photodiodes (LAAPDs) from Radiation Monitoring Devices as X-ray detectors, and they were used during the last data taking period in 2003. For X-ray spectroscopy applications, these LAAPDs have to be cooled in order to suppress the dark current noise; hence, a series of tests were performed to choose the optimal operation temperature. Specifically, the temperature dependence of gain, energy resolution, dark current, excess noise factor, and detector response linearity was studied. Finally, details of the LAAPDs application in the muonic hydrogen experiment as well as their response to α particles are presented.
