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You searched on: Author: ryan fitzgerald

Displaying records 11 to 20 of 21 records.
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11. Charged-Particle Thermonuclear Reaction Rate Evaluation for A=12-40 Nuclei: I. Monte Carlo Method and Statistical Distributions
Published: 4/28/2010
Authors: Ryan P Fitzgerald, R Longland, C. Iliadis, E. Champagne, J.R. Newton, C. Ugalde
Abstract: A new method based on Monte Carlo techniques is presented for evaluating thermonuclear reaction rates. We begin by reviewing commonly applied procedures and point out that reaction rates that have been reported up to now in the literature have no rig ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842419

12. Charged-Particle Thermonuclear Reaction Rates: II. Tables and Graphs of Reaction Rates and Probability Density Functions.
Published: 4/9/2010
Authors: C. Iliadis, R Longland, A E Champagne, A. Coc, Ryan P Fitzgerald
Abstract: Numerical values of charged-particle thermonuclear reaction rates for nuclei in the A=14-40 region are tabulated. The results are obtained using a method, based on Monte Carlo techniques, that has been described in the preceding paper of this series ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904290

13. Look at Data to Evaluate Uncertainty: A comment on "Uranium Assay Determination...." by Mathew et al.
Published: 2/25/2010
Author: Ryan P Fitzgerald
Abstract: According to the Guide to the Expression of Uncertainty in Measurement (GUM), the evaluation of uncertainty should be based as much as possible on observed data. In a recent paper, Mathew et al. detailed, for a specific titration-based assay of urani ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904570

14. A New Primary Standardization of Th-229
Published: 1/7/2010
Authors: Ryan P Fitzgerald, Lizbeth Laureano-Perez, Michelle M. Hammond, Leticia S Pibida, Svetlana Nour, Brian Edward Zimmerman
Abstract: The National Institute of Standards and Technology (NIST) has certified a high-purity Th-229 Standard Reference Material as SRM 4328C, based on live-timed 4-pi alpha,beta-gamma anticoincidence counting (LTAC) of the equilibrium solution. The LTAC sy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903482

15. An Automated Ionization Chamber for Secondary Radioactivity Standards
Published: 12/8/2009
Author: Ryan P Fitzgerald
Abstract: We report on the operation and characterization of a new ionization chamber system, called AUTOIC, featuring a commerical digital electrometer and a commerical robotic sample changer. The ralative accuracy of the electrometer was improved significan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903476

16. Half-life Measurements of Sr82
Published: 1/30/2009
Authors: Leticia S Pibida, Ryan P Fitzgerald, Michael P Unterweger, Michelle M. Hammond, Daniel B. Golas
Abstract: Half-life measurements of 82Sr were performed at the National Institute of Standards and Technology (NIST) using gamma-ray spectrometry and a 4 pressurized ionization chamber. The 82Sr half-life was determined to be 25.36 &plu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842553

17. Standardization of 68Ge/68Ga using three liquid scintillation counting-based methods
Series: Journal of Research (NIST JRES)
Published: 10/31/2008
Authors: Brian Edward Zimmerman, Jeffrey T Cessna, Ryan P Fitzgerald
Abstract: A solution containing 68Ge in equilibrium with its daughter, 68Ga, has been standardized for the first time at the National Institute of Standards and Technology using 3 liquid scintillation- based techniques: live-timed 4pb-g anticoincidence (LTAC) ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842499

18. A Liquid-Scintillation-based Primary Standardization of 210Pb
Published: 12/1/2007
Authors: L Laureano-p{eacute}rez, R Coll{eacute}, Ryan P Fitzgerald, Iisa Outola, Leticia S Pibida
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100977

19. Development of a Compton Suppression Technique based on a Neural Network-
Published: 1/1/2005
Authors: Ryan P Fitzgerald, A E Champagne
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103125

20. Studies of (p,y) Reactions with the Daresbury Recoil Separator at ORNL'S HRIBF
Published: 1/1/2005
Authors: Ryan P Fitzgerald, E Abbotoy, D W Bardayan, J C Blackmon, A E Champagne, A A Chen, U Greife, D W Hill, A N James, R L Kozub, T A Lewis, R Livesay, Z Ma, S L Mahan, J W Mcconnell, W T Milner, B H Moazen, P D Parker, D E Pierce, M E Roettger, L Sahin, D Shapira, M S Smith, F Strieder, K B Swartz, J S Thomas, D W Visser
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103124



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