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1. Measuring the Neutron Lifetime with Magnetically Trapped Ultracold Neutrons
Published: 12/16/2013
Author: Hans P Mumm
Abstract: We describe an experiment to measure the neutron lifetime using a technique with a set of systematic uncertainties largely different than those of previous measurements. In this approach, UCN are produced by inelastic scattering of cold (0.89 nm) ne ...

2. 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 ...

3. 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 ...

4. 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/ ...

5. 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 ...

6. Cryogenic Design and Performance of an Apparatus for Magnetically Trapping Ultracold Neutrons
Published: 10/5/2014
Author: Hans P Mumm
Abstract: The cryogenic design and performance of an apparatus used to magnetically confine ultracold neutrons (UCN) is presented. The apparatus is part of an effort to measure the beta-decay lifetime of the free neutron and is comprised of a high-current su ...

7. Experimental Parameters for a Reactor Antineutrino Experiment at Very Short Baselines
Published: 4/23/2013
Author: Hans P Mumm
Abstract: Reactor antineutrinos are used to study neutrino oscillation, search for signatures of non-standard neutrino interactions, and to monitor reactor operation for safeguard applications. The flux and energy spectrum of reactor antineutrinos can be predi ...

8. 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

9. 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 Eberhardt Wietfeldt, R C Welsh, J F Wilkerson

10. 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 Eberhardt Wietfeldt, T E Chupp, R L Cooper, E J Beise, K G Kiriluk, J Byrne, K Coakley

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