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Abstract
The Project 8 collaboration seeks to measure the absolute neutrino mass scale by means of precision spectroscopy of the beta decay of tritium. Our technique, cyclotron radiation emission spectroscopy, measures the frequency of the radiation emitted by electrons produced by decays in an ambient magnetic field. Because the cyclotron frequency is inversely proportional to the electron’s Lorentz factor, this is also a measurement of the electron’s energy. In order to demonstrate the viability of this technique, we have assembled and successfully operated a prototype system, which uses a rectangular waveguide to collect the cyclotron radiation from internal conversion electrons emitted from a gaseous 83m Kr source. Here we present the main design aspects of the first phase prototype, which was operated during parts of 2014 and 2015. We will also discuss the procedures used to analyze these data, along with the features which have been observed and the performance achieved to date.
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Details
1 Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, WA, USA
2 Johannes Guttenberg University, Mainz, Germany
3 Department of Physics, University of California, Santa Barbara, CA, USA
4 Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
5 Pacific Northwest National Laboratory, Richland, WA, USA
6 Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA, USA
7 Department of Physics, Yale University, New Haven, CT, USA
8 Lawrence Livermore National Laboratory, Livermore, CA, USA
9 Karlsruhe Institute for Technology, Karlsruhe, Germany