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1. Survival analysis approach to account for non-exponential decay rate effects in lifetime experiments
Kevin J Coakley, Maynard S Dewey, Michael G Huber, Hans P Mumm, Alan K Thompson, Andrew T. Yue, C. R. Huffer, P. R. Huffman, C. M. O'Shaughnessy, K. W. Schelhammer, D. E. Marley
In experiments that measure the lifetime of trapped particles, in addition to loss mechanisms with exponential survival probability functions, particles can be lost by mechanisms with non-exponential survival probability functions. Failure to account ...
2. Noble Gas Excimer Scintillation Following Neutron Capture in Boron Thin Films
Alan K Thompson, Jacob McComb, Charles W Clark, Michael A. Coplan, Mohamad Al-Sheikhly, Robert Edward Vest
Far-ultraviolet (FUV) scintillation signals have been measured in heavy noble gases (argon, krypton, xenon) following boron-neutron capture (10B(n,α)7Li) in 10B thin films. The observed scintillation yields are comparable to the yields from some ...
3. Neutron Test Results of Preliminary Measurements and Calculations Using a Handheld Instrument
Technical Note (NIST TN)
Leticia S Pibida, Craig Heimbach, Bruce R Norman, Alan K Thompson, Maynard S Dewey
Initial neutron measurements and calculations were performed to investigate the response of handheld
radionuclide identifiers (RIDs) to neutron sources with different moderators/scattering conditions
4. Search for a T-odd, P-even Triple Correlation in Neutron Decay
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
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 ...
5. A New Limit on Time-Reversal Violation in Beta Decay
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
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 ...
6. A gamma and X-ray dector for cryogenic, high magnetic field applications
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, B. O'Neill, K. Pulliam, Alan K Thompson, F E. Wietfeldt
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 ...
7. Effect of Neutron Irradiation on Dosimetric Properties of the TLD-600H (Lif6:Mg,Cu,P)
Alexander A Romanyukha, Ronaldo Minniti, M. Moscovitch, Alan K Thompson, F. Trompier, Ronald Colle, A Sucheta, S. P. Voss, L. A. Benevides
Ideally, dosimeters should measure the dose without their dosimetric properties being affected by the radiation type being measured. Industry-wide occupational radiation workers that can be potentially exposed to neutron radiation fields are routine ...
8. Fast Neutron Detection with Li-6-loaded Liquid Scintillator
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
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 ...
9. Far-ultraviolet signatures of the 3He(n,tp) reaction in noble gas mixtures
Patrick Hughes, Alan K Thompson, Michael Coplan, Robert Edward Vest, Charles W Clark
Previous work showed that the 3He(n,tp) reaction in a cell of 3He at atmospheric pressure generated tens of far-ultraviolet photons per reacted neutron. Here we report amplification of that signal by factors of 1000 and more when noble gases are adde ...
10. An experiment for the precision measurement of the radiative decay mode of the neutron
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
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 ...