Bulletin of the American Physical Society
2011 Fall Meeting of the APS Division of Nuclear Physics
Volume 56, Number 12
Wednesday–Saturday, October 26–29, 2011; East Lansing, Michigan
Session MA: Mini-Symposium on Emerging Needs for Nuclear Data I |
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Chair: Artemis Spyrou, Michigan State University Room: 62 |
Saturday, October 29, 2011 8:30AM - 9:06AM |
MA.00001: ENDF/B-VII.1 library - current and future trends in reaction data Invited Speaker: Michal Herman The ENDF/B-VII.0 library, made available in December 2006, has been the first major release of the US nuclear reaction data library in 16 years. Intensive validation proved generally good performance of the library but a number of deficiencies were discerned. In 2008 CSEWG decided to undertake multi-laboratory effort leading to VII.1 version, which is scheduled for release in December 2011. Highlights of the new library include (i) a consistent set of covariance data, for over 180 materials, targeting explicit needs of the Advanced Fuel Cycle Initiative, (ii) new R-matrix based evaluations for several light nuclei, (iii) evaluations for reactions on structural materials in both the fast neutron region and the resonance region, (iv) improvements of resonances regions and thermal cross sections for certain fission products and neutron absorber materials (Cd, Gd), (v) improvements in minor actinide evaluations for isotopes of U, Np, Pu, and Am, (vi) adoption of JENDL4.0 evaluations for the Cm, Bk, Cf, Es, Fm, and some other minor actinides, (vii) fission product yield advances for fission-spectrum neutrons and 14 MeV neutrons incident on $^{239}$Pu, and (viii) a new Decay Data sub-library. No significant changes are expected for the major actinides $^{235,8}$U and $^{239}$Pu, except reverting delayed neutron data to ENDF/B-VI.8 and adding covariances. Current update concerns only the most important neutron, fission yields, and decay data sub-libraries leaving the remaining 11 sub-libraries unchanged. Open issues and trends for the future releases of the ENDF/B will be discussed. [Preview Abstract] |
Saturday, October 29, 2011 9:06AM - 9:18AM |
MA.00002: Calculation of Maxwellian-averaged cross sections and their uncertainties using ENDF/B-VII.1 evaluated neutron library Boris Pritychenko Present contribution represents a first application of ENDF/B-VII.1 neutron library for calculation of Maxwellian-averaged cross sections and astrophysical reaction rates. Recent improvements in neutron cross section evaluations and more extensive utilization of covariance files, by the CSEWG collaboration, allowed us to perform complete calculations and provide additional insights on all currently available neutron-induced reaction data. Nuclear reaction calculations using ENDF libraries and current Java technologies will be discussed and new results will be presented. This work was sponsored by the Office of Nuclear Physics, Office of Science of the U.S. Department of Energy, under Contract No. DE-AC02-98CH10886 with Brookhaven Science Associates, LLC. [Preview Abstract] |
Saturday, October 29, 2011 9:18AM - 9:30AM |
MA.00003: New Features in the Computational Infrastructure for Nuclear Astrophysics Michael S. Smith, Eric J. Lingerfelt, W. Raphael Hix, Caroline D. Nesaraja, Kyle Thomsen The {\bf Computational Infrastructure for Nuclear Astrophysics (CINA)} is a platform- independent suite of computer codes that are freely available online at {\bf http://nucastrodata.org}. The system enhances the utilization of nuclear data by streamlining the process to include the latest data into astrophysics simulations. Users can upload measured or calculated cross sections, process them into reaction rates, incorporate rates into libraries, run simulations with these custom libraries, and store and visualize the results -- all with a simple graphical user interface. New features in CINA include: automated studies of the sensitivity of astrophysical predictions on nuclear input; calculation of thermonuclear reaction rates from resonance information; and the ability to extract information from several additional international databases. Several utilizations of, and future plans for, this software suite will be given. [Preview Abstract] |
Saturday, October 29, 2011 9:30AM - 9:42AM |
MA.00004: Fission product $^{87}$Kr studied with Modular Total Absorption Spectrometer at the HRIBF A. Ku\'zniak, M. Karny, K. Rykaczewski, C.J. Gross, J. Johnson, M. Wolinska-Cichocka, R. Grzywacz, D. Miller, B.C. Rasco Modeling of the decay heat of uranium and plutonium fission products is one of the main challenges of contemporary applied nuclear physics. The differences between measured and calculated values are believed to be due to the incorrect or incomplete decay schemes measured with low efficiency detectors. Recently, a very efficient Modular Total Absorption Spectrometer, has been constructed at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory. Its full energy peak efficiency reaches 90\% for 300 keV and over 75\% for 5 MeV gamma rays. Results of the first test measurements of the 238-Uranium fission product $^{87}$Kr will be presented. [Preview Abstract] |
Saturday, October 29, 2011 9:42AM - 9:54AM |
MA.00005: Nuclear Data Needs for Research at the Facility for Rare Isotope Beams Bradley Sherrill Estimates indicate that the Facility for Rare Isotope Beams, FRIB, could produce 1000 new isotopes and allow the detailed study of in total nearly 4500 isotopes. With this potential for discovery, one of the main scientific goals of the facility is to make the series of measurements that will allow a comprehensive model of atomic nuclei to be developed. Evaluation and interpretation of nuclear data will be one of the key steps in reaching this goal. Hence, research at FRIB will both require and generate large amounts of nuclear data. This makes a close connection to the US Nuclear Data Program essential. A connection could also be useful to identify the new measurements that should be made to fill in missing, important data for applied programs as well as basic research. The talk will prove an overview of these issues and the projected capabilities of FRIB. [Preview Abstract] |
Saturday, October 29, 2011 9:54AM - 10:06AM |
MA.00006: Nuclear Science with Thermal and Fast Neutrons at UMass Lowell C.J. Guess, P. Chowdhury, N. Borges, N. D'Olympia, A.Y. Deo, T. Harrington, S. Hota, E.G. Jackson, G. Kegel, S. Lakshmi, G. Parker, V.S. Prasher, K. Recca, T. Regan, J. Thomas, Q. Yuan Increased interest in improving nuclear data for applied nuclear science has prompted new research activity at the UMass Lowell Radiation Laboratory. At the 5.5-MV CN Van de Graaff accelerator facility, the beamline for precision (n,$\gamma$) and (n,n'$\gamma$) measurements with sub-nanosecond proton beam bunches is being refurbished. A proton microbeam facility is being installed for interdisciplinary studies of materials using applied nuclear techniques. In addition, the thermal column of the 1-MW research reactor will be fitted with a new shielded area for thermal (n,$\gamma$) measurements. Neutron flux measurements, shielding calculations, and simulations are underway. Progress, status and research plans with these facilities will be discussed. [Preview Abstract] |
Saturday, October 29, 2011 10:06AM - 10:18AM |
MA.00007: Putting it all together: Nuclear Data as input for Nuclear Astrophysics Richard Cyburt The Joint Institute for Nuclear Astrophysics (JINA) main goal is to open and maintain close ties within the nuclear astrophysics community. A reoccurring theme throughout nuclear astrophysics is the need for and use of the best available nuclear data as input for astrophysics calculations. I will discuss how one can use JINA Online Tools to augment their research and how that research can facilitate new efforts gathering data. I will discuss the JINA Virtual Journal, REACLIB reaction rate and NUCDATALIB nuclide property databases. [Preview Abstract] |
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