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You searched on: Author: Jeffrey Nico

Displaying records 1 to 10 of 67 records.
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1. Development and characterization of a High Sensitivity Segmented Fast Neutron Spectrometer (FaNS-2)
Published: 1/15/2016
Authors: T.J. Langford, E J Beise, H Breuer, Craig Heimbach, G Ji, Jeffrey S Nico
Abstract: We present the development of a segmented fast neutron spectrometer (FaNS-2) based upon plastic scintillator and He-3 proportional counters. It was designed to measure both the flux and spectrum of fast neutrons in the energy range of few MeV to ...

2. Nonproportionality in the scintillation light yield of bismuth germanate
Published: 11/11/2014
Authors: Thomas R Gentile, M J Bales, H Breuer, T E Chupp, Kevin J Coakley, R L Cooper, Jeffrey S Nico, B. O'Neill
Abstract: We present measurements of nonproportionality in the scintillation light yield of bismuth germanate (BGO) for gamma-rays with energies between 6 keV and 662 keV. The scintillation light was read out by avalanche photodiodes (APDs) with both the BGO c ...

3. Fast Neutron Detection with a Segmented Spectrometer
Published: 11/4/2014
Authors: Jeffrey S Nico, T J. Langford, Christopher D. Bass, H Breuer, Craig Heimbach, D. K. Erwin
Abstract: A fast neutron spectrometer consisting of segmented plastic scintillator and He-3 proportional counters was constructed for the measurement of neutrons in the energy range 1 MeV to 200 MeV. We discuss its design, principles of operation, and the meth ...

4. International Key Comparison of Neutron Fluence Measurements in Monoenergetic Neutron Fields ‹ CCRI(III)-K11
Published: 11/3/2014
Authors: Maynard S Dewey, V. Gressier, A. C. Bonaldi, David McLarty Gilliam, H. Harano, A. Masuda, T Matsumoto, N. Moiseev, Jeffrey S Nico, R. Notle, S. Oberstedt, N. J. Roberts, S. Rottger, D. J. Thomas
Abstract: To ensure the validity of their national standards, National Metrology Institutes, NMIs, participate regularly in international comparisons. In the area of neutron metrology, Section III of the Consultative Committee for Ionizing Radiation is in char ...

5. Significant disparity in base and sugar damage in DNA by neutron and electron irradiation
Published: 7/1/2014
Authors: Pawel Jaruga, Jeffrey S Nico, Lisa R Karam, Olga Timofeeva, William Blakely, M Miral Dizdar, D Pang
Abstract: In this study a comparison of the effects of high-LET neutrons with low-LET electrons on irradiation of aqueous DNA solutions was investigated to characterize for potential neutron signatures on DNA damage induction. Ionizing radiations generate ...

6. 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 ...

7. 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 ...

8. 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 ...

9. 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 ...

10. 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 ...

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