Precision determination of pion mass using x-ray CCD spectroscopy

D. F. Anagnostopoulos; M. Augsburger; Gunther L. Borchert; D. Chatellard; Michael Mace Daum; J.-P. Egger; Detlev Gotta; P. Hauser; P. Indelicato; E. Jeannet; K. Kirch; Nick Nelms; O. W. Schult; T. Siems; Leopold M. Simons; Alan A. Wells

doi:10.1117/12.333618

17 December 1998 Precision determination of pion mass using x-ray CCD spectroscopy

D. F. Anagnostopoulos, M. Augsburger, Gunther L. Borchert, D. Chatellard, Michael Mace Daum, J.-P. Egger, Detlev Gotta, P. Hauser, P. Indelicato, E. Jeannet, K. Kirch, Nick Nelms, O. W. Schult, T. Siems, Leopold M. Simons, Alan A. Wells

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Proceedings Volume 3443, X-Ray and Ultraviolet Spectroscopy and Polarimetry II; (1998) https://doi.org/10.1117/12.333618
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

An experiment is described which aims to determine the pion mass to 1 ppm or better, from which a new determination of the upper limit of the muon neutrino mass is anticipated. The approach utilizes spectroscopy of X-ray emissions from pionic atoms formed in gaseous targets. The spectroscopy is performed with a Bragg crystal spectrometer, with an energy resolution of approximately 300 meV, using an array of X-ray CCDs mounted at the focus to measure the spectral line structure of the 4 keV pionic nitrogen transition. To achieve sub-ppm accuracy, as energy calibration a muonic oxygen transition is used. It is known with a precision of 0.3 ppm and almost coincides in energy with the pionic transition.

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D. F. Anagnostopoulos, M. Augsburger, Gunther L. Borchert, D. Chatellard, Michael Mace Daum, J.-P. Egger, Detlev Gotta, P. Hauser, P. Indelicato, E. Jeannet, K. Kirch, Nick Nelms, O. W. Schult, T. Siems, Leopold M. Simons, and Alan A. Wells "Precision determination of pion mass using x-ray CCD spectroscopy", Proc. SPIE 3443, X-Ray and Ultraviolet Spectroscopy and Polarimetry II, (17 December 1998); https://doi.org/10.1117/12.333618

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