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Author: hans mumm
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1. A New Limit on Time-Reversal Violation in Beta Decay
Published: 9/2/2012
Authors: Hans P Mumm, T E. Chupp, K P Coulter, R L Cooper, S J Freedman, B. K. Fujikawa, A. Garcia, G L. Jones, Jeffrey S Nico, Alan K Thompson, C A Trull, J. F. Wilkerson, F. E Wiefeldt
Abstract: We report the results of an improved determination of the triple correlation DP , (p_e × p_v) that can be used to limit possible time-reversal invariance in the beta decay of polarized neutrons and constrain extensions to the Standard Model. Our resu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908635

2. A gamma and X-ray dector for cryogenic, high magnetic field applications
Published: 7/13/2012
Authors: Thomas R Gentile, R L Cooper, R. Alarcon, M J Bales, E J Beise, H Breuer, J. Byrne, T E. Chupp, Kevin J Coakley, Maynard S Dewey, Changbo Fu, Hans P Mumm, Jeffrey S Nico, Brian O'Neill, K. Pulliam, Alan K Thompson, F E. Wietfeldt
Abstract: As part of an experiment to measure the spectrum of photons emitted in beta-decay of the free neu- tron, we developed and operated a detector consisting of 12 bismuth germanate (BGO) crystals coupled to avalanche photodiodes (APDs). The detector wa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911584

3. An Upper Bound on Parity Violating Neutron Spin Rotation in He-4
Published: 1/31/2011
Authors: Jeffrey S Nico, W M. Snow, Christopher D. Bass, Tiffany D. Bass, B. E. Crawford, K. F. Gan, B R Heckel, D Lou, D M Markoff, A M. Micherdzinska, Hans P Mumm, A. K. Opper, M Sarsour, E I Sharapov, H E Swanson, S. C Walbridge, V Zhumabekova
Abstract: We report an upper bound on parity violating neutron spin rotation in He-4. This experiment is the most sensitive search for neutron weak optical activity yet performed. Our result for the neutron spin rotation angle per unit length in He-4 is dphi/ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906487

4. An experiment for the precision measurement of the radiative decay mode of the neutron
Published: 10/5/2009
Authors: R Cooper, Christopher D. Bass, E Beise, H Breuer, J Byrne, T E. Chupp, Kevin J Coakley, Maynard S Dewey, B Fisher, Changbo Fu, Thomas R Gentile, M. McGonagle, Hans P Mumm, Jeffrey S Nico, Alan K Thompson, F E. Wietfeldt
Abstract: The neutron typically beta decays into a proton, electron, and antineutrino. In some decays, it can be accompanied by a high energy photon. We recently performed the rst observation of the radiative beta decay branch for the free neutron with phot ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842579

5. Measurement of the Parity-Violating Neutron Spin Rotation in ^u4^He
Published: 1/1/2005
Authors: Christopher D. Bass, J M Dawkins, D Luo, A M. Micherdzinska, M Sarsour, W M. Snow, Hans P Mumm, Jeffrey S Nico, P R Huffman, D M Markoff, B R Heckel, H E Swanson
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103002

6. New Limit on the {I}D{I} Coefficient in Polarized Neutron Decay
Published: 1/1/2000
Authors: L Lising, S R Hwang, J M Adams, T J Bowles, M C Browne, T E Chupp, K A Coulterpark, Maynard S Dewey, S J Freedman, B K Fujikawa, A Garcia, G L Greene, G L Jones, Hans P Mumm, Jeffrey S Nico, J M Richardson, R G Robertson, W A Teasdale, Alan K Thompson, E G Wasserman, Fred E. Wietfeldt, R C Welsh, J F Wilkerson
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103223

7. Observation of the Radiative Decay Mode of the Free Neutron
Published: 1/1/2006
Authors: Jeffrey S Nico, Maynard S Dewey, Thomas R Gentile, Hans P Mumm, Alan K Thompson, B M Fisher, I Kremsky, Fred E. Wietfeldt, T E Chupp, R L Cooper, E J Beise, K G Kiriluk, J Byrne, K Coakley
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103274

8. Observation of the Radiative Decay Mode of the Free Neutron
Published: 12/29/2006
Authors: Jeffrey S Nico, Maynard S Dewey, Thomas R Gentile, Hans P Mumm, Alan K Thompson, B Fisher, I Kremsky, Fred E. Wietfeldt, T E Chupp, R Cooper, E Beise, K G Kiriluk, J Byrne, Kevin J Coakley
Abstract: The theory of quantum electrodynamics predicts that beta decay of the neutron into a proton, electron, and antineutrino should be accompanied by a continuous spectrum of soft photons. While this inner bremsstrahlung branch has been previously measure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841194

9. Particle and Photon Detection for a Neutron Radiative Decay Experiment
Published: 4/11/2007
Authors: Thomas R Gentile, Maynard S Dewey, Hans P Mumm, Jeffrey S Nico, Alan K Thompson, T E. Chupp, R Cooper, B M Fisher, I Kremsky, F E. Wietfeldt, K G Kiriluk, E Beise
Abstract: We present the particle and photon detection methods employed in a program to observe neutron radiative beta-decay. The experiment is located at the NG-6 beam line at the National Institute of Standards and Technology Center for Neutron Research. E ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841179

10. Polarized neutron beam properties for measuring parity-violating spin rotation in liquid He4
Published: 12/14/2010
Authors: A M. Micherdzinska, C. D. Bass, T. D. Bass, K. F. Gan, D Lou, D M Markoff, Hans P Mumm, Jeffrey S Nico, A. K. Opper, E I Sharapov, M Snow, H E Swanson, V Zhumabekova
Abstract: Measurements of parity-violating neutron spin rotation can provide insight into the poorly nderstood nucleon-nucleon weak interaction. Because the expected rotation angle per unit length is small (10−7 rad/m), several properties of the polarize ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905585



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