By Christopher R Gould, Robert Haight, Paul E Koehler
The spallation neutron resource (SNS) being equipped on the Oak Ridge nationwide Laboratory (ORNL) can be by means of some distance the top flux pulsed resource of epithermal neutrons on this planet whilst it comes on-line in 2006. even supposing the most thrust of the technological know-how programme on the SNS might be fabrics technological know-how, the ability may provide impressive possibilities for learn in nuclear astrophysics, primary symmetries, and utilized nuclear physics. to check the present prestige of those fields and to start to gather the clinical case and the group of researchers for destiny experiments on the SNS, a workshop on ''Astrophysics, Symmetries, and utilized Physics'' used to be held in March 2002 on the ORNL. Over 60 scientists, representing eleven US and 4 overseas universities in addition to many nationwide laboratories worldwide, participated within the workshop. The complaints describe the kingdom of analysis in these fields and the longer term possibilities on the SNS.
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Additional resources for Astrophysics, Symmetries, and Applied Physics at Spallation Neutron Sources
Stable isotopes were placed in past nuclear explosion tests as diagnostic aids which integrated the neutron exposure over the entire explosion history. ) Neutron cross sections are needed for neutron energies up to about 1 MeV. 9 y 172 • OVy) 2J Tm d Figure 2. An example of a reaction sequence where cross sections needed for "rad-chem" diagnostics Three separate experimental components are needed to make these measurements: An intense neutron source, facilities to fabricate and handle radioactive targets, and an efficient, well characterized gamma detector.
70 x 103 N/cm2/eV/sec)/E. E+07 " \ 1 * n — • r. : _ ! E+06 Energy (eV) Figure 3. Measured surface currents compared to expected value. 16 cm Al tubing. The targets studied were Au, ""•"°'^u powder, each contained in a small quartz tube, l50,l52Sm powder in quartz, and 151Sm deposited on a thin Ti foil. These data are still being analyzed. 8% pure material prepared by the Chemistry Division. 16 eV. 5 mg 'Sm target. The isotopic composition of this target is 71% 151Sm, 13% 150Sm, 7% 152Sm, 6% l47Sm, and 1% ,49Sm.
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