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Author: jeffrey nico
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1. Improved Determination of the Neutron Lifetime
Published: 12/2/2013
Authors: Jeffrey S Nico, A. T. Yue, Maynard S Dewey, David McLarty Gilliam, G L. Greene, A. Laptev, W M. Snow, F. E Wiefeldt
Abstract: The most precise determination of the neutron lifetime using the beam method was completed in 2005 and reported a result of tau_n = (886.3 ± 1.2 [stat] ± 3.2 [sys]) s. The dominant uncertainties were attributed to the absolute determination of the f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914740

2. Event Identification in He-3 Proportional Counters Using Risetime Discrimination
Published: 4/2/2013
Authors: Jeffrey S Nico, T J. Langford, Christopher D. Bass, E J Beise, D. K. Erwin, Craig Heimbach
Abstract: We present a straightforward method for particle identification and background rejection in He-3 proportional counters for use in neutron detection. By measuring the risetime and pulse height of the preamplifier signals, one may define a region in th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913012

3. Characterization of a 6Li-loaded liquid organic scintillator for fast neutron spectrometry and thermal neutron detection
Published: 3/24/2013
Authors: Jeffrey S Nico, C. D. Bass, E J Beise, Craig Heimbach, T. Langford
Abstract: We present the characterization of a liquid scintillator incorporating an aqueous solution of enriched lithium chloride to produce a scintillator with 0.40% 6Li. We report on its performance in terms of optical properties and neutron response. We inc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911570

4. Search for a T-odd, P-even Triple Correlation in Neutron Decay
Published: 9/14/2012
Authors: Jeffrey S Nico, T E. Chupp, K P Coulter, R L Cooper, S. J. Freeman, B. K. Fujikawa, A. Garcia, G L. Jones, Hans P Mumm, Alan K Thompson, C A Trull, F. E Wiefeldt, J. F. Wilkerson
Abstract: Time-reversal-invariance (T) violation, or equivalently, assuming charge-conjugation-parity-time-reversal (CPT) invariance, CP violation may explain the observed cosmological baryon asymmetry as well as signal physics beyond the Standard Model. In th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911424

5. 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

6. 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

7. Magnetic field effects on large area avalanche photodiodes at cryogenic temperatures
Published: 8/30/2011
Authors: Thomas R Gentile, C. D. Bass, Jeffrey S Nico, H Breuer, R Farrell
Abstract: We present results for detection of X-rays by large area avalanche photodiodes (APDs) in strong magnetic fields and at cryogenic temperatures. Whereas at room temperature we observe essentially no effects on the response, at cryogenic temperature ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905589

8. Fast Neutron Detection with Li-6-loaded Liquid Scintillator
Published: 4/12/2011
Authors: David McLarty Gilliam, B Fisher, J N Abdurashitov, Kevin J Coakley, V N Gavrin, Jeffrey S Nico, A A Shikhin, Alan K Thompson, Dominic F. (Dominic F.) Vecchia, V E Yants
Abstract: We report on the development of a fast neutron detector using a liquid scintillator doped with enriched 6Li. The lithium was introduced in the form of an aqueous LiCl micro-emulsion with a di-isopropylnaphthalene based liquid scintillator. A 6Li conc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907289

9. 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

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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