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You searched on: Author: jeffrey nico

Displaying records 11 to 20 of 67 records.
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11. 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, B. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. Prospects for a New Cold Neutron Beam Measurement of the Neutron Lifetime
Published: 10/5/2009
Authors: Maynard S Dewey, Kevin J Coakley, David McLarty Gilliam, G. Greene, A. Laptev, Jeffrey S Nico, W M. Snow, F. E Wiefeldt, A. Yue
Abstract: In the most accurate cold neutron beam determination of the neutron lifetime based on the absolute counting of decay protons, the largest uncertainty was attributed to the absolute determination of the capture flux of the cold neutron beam. Currentl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842578

18. Neutron Beta-Decay
Published: 9/16/2009
Author: Jeffrey S Nico
Abstract: Studies of low-energy processes, such as neutron beta-decay, contribute important information regarding die rent aspects of physics including nuclear and particle physics and cosmology. The information from these systems is often complementary to tha ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902353

19. Measuring 6LI(N,T) and 10B(N,A) Cross Sections Using the NIST Alpha-Gamma Device
Published: 4/15/2009
Authors: Maynard S Dewey, David McLarty Gilliam, Jeffrey S Nico, G.L. Green, A. Laptev, A. Yue
Abstract: The 6LI(N,T) and 10B(N,A) cross sections are important neutron cross section standards. Precise knowledge of these cross sections is essential because they are often used as reference standards for obtaining the neutron fluence in investigations of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901148

20. Pulse Shape Discrimination for a Fast Neutron Detector
Published: 2/9/2009
Authors: Kevin J Coakley, Dominic F. (Dominic F.) Vecchia, Jeffrey S Nico, B Fisher
Abstract: We are developing a detector that uses liquid scintillator loaded with Li-6 for the efficient measurement of fast neutrons and their energy. Such a detector would have both scientific applications such as quantification of neutron energy spectra in u ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900208



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