Physics at Virginia

Stefan Baeßler

Ph.D., 1996, University of Heidelberg
Associate Professor

Experimental Nuclear and Particle Physics

Research Interests

Professor Baeßler does research in fundamental symmetries, that is, precision tests of the Standard Model of Elementary Particles. His main activities are devoted to physics with cold neutrons at the SNS in Oak Ridge/Tennessee. He conducts experiments that study neutron beta decay (Nab and pNab) and in hadronic weak interactions (npdgamma, nHe3). In addition, he is testing gravity with ultracold neutrons at the ILL in Grenoble/France (GRANIT), and he is determining the magnetic moment of the muon (g-2) at Fermilab.

Selected Publications

J. Fry, R. Alarcon, S. Baeßler, S. Balascuta, L. Barron-Palos, T. Bailey, K. Bass, N. Birge, A. Blose, D. Borissenko, J. D. Bowman, L. J. Broussard, A. T. Bryant, J. Byrne, J. R. Calarco, J. Caylor, K. Chang, T. Chupp, T. V. Cianciolo, C. Crawford, X. Ding, M. Doyle, W. Fan, W. Farrar, N. Fomin, E. Frlez, M. T. Gericke, M. Gervais, F. Gluck, G. L. Greene, R. K. Grzywacz, V. Gudkov, J. Hamblen, C. Hayes, C. Hendrus, T. Ito, A. Jezghani, H. Li, M. Makela, N. Macsai, J. Mammei, R. Mammei, M. Martinez, D. G. Matthews, M. McCrea, P. McGaughey, C. D. McLaughlin, P. Mueller, D. van Petten, S. I. Penttila, D. E. Perryman, R. Picker, J. Pierce, D. Počanić, Y. Qian, J. Ramsey, G. Randall, G. Riley, K. P. Rykaczewski, A. Salas-Bacci, S. Samiei, E. M. Scott, T. Shelton, S. K. Sjue, A. Smith, E. Smith, E. Stevens, J. Wexler, R. Whitehead, W. S. Wilburn, A. Young, B. Zeck,
The Nab Experiment: A Precision Measurement of Unpolarized Neutron Beta Decay
Eur. Phys. J. Web Conf. 219, 04002 (2019)

M. Beck, F. Ayala Guardia, M. Borg, J. Kahlenberg, R. Muñoz Horta, C. Schmidt, A. Wunderle, W. Heil, S. Baeßler, F. Glück, M. Klopf, G. Konrad, R. Maisonobe, M. Simson, T. Soldner, R. Virot, O. Zimmer, U. Schmidt,
Improved determination of the \(\beta-{\bar\nu}_e\)  angular correlation coefficient a in free neutron decay with the aSPECT spectrometer
Phys. Rev. C 101, 055506 (2020)

D. Blyth, J. Fry, N. Fomin, R. Alarcon, L. Alonzi, E. Askanazi, S. Baeßler et al.
First Observation of P-odd γ Asymmetry in Polarized Neutron Capture on Hydrogen
Phys. Rev. Lett. 121, 242002 (2018), arXiv:1807.10192

S. Baeßler, V.V. Nesvizhevsky, G. Pignol, K.V. Protasov, D. Rebreyend, E. Kupriyanova, A. Yu. Voronin
Frequency shifts in gravitational resonance spectroscopy
Phys. Rev. D 91, 042006 (2015)

S. Baeßler, D. Bowman, S. Penttilä, D. Pocanic
New precision measurements of free neutron beta decay with cold neutrons invited paper for focus issue The precision frontier in semileptonic weak interactions
J. Phys. G: Nucl. Part. Phys. 41, 114003 (2014)

Complete list

News Items

The first result from the Muon g-2 experiment at Fermilab was unveiled and discussed publicly on Wednesday, 7 April 2021, in a special set of online seminars, that attracted widespread ......More >
The weak interaction of quarks between the neutron and proton have been measured for the first time by the NPDGamma experiment at the Spallation Neutron Source in Oak Ridge ......More >
Dinko Pocanic and Stefan Baessler, in collaboration with colleagues from Arizona State University and Oak Ridge National Lab, have received funding for the development of a spectrometer optimized ......More >