International Topical Meeting on Nuclear Research Applications and Utilization of Accelerators
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ADS/ND-04 Nuclear Data Measurements at the RPI LINAC Y. Danon1, G. Leinweber2, R.C. Block2, D.P. Barry2, F.J. Saglime2, M.J. Rapp2, M.J. Trbovich2, R.M. Bahran2, C.E. Romano2, and J.G. Hoole2 1Rensselaer Polytechnic Institute, Troy, New York, United States of America Corresponding Author: leinwg@rpi.edu The RPI Linac is a 60 MeV electron accelerator located in upstate New York, USA. A pulsed neutron source is used for a variety of experiments primarily related to nuclear data measurements. This presentation and paper will provide an overview of measurement capabilities and results, with a focus on new work since the 2007 conference. New capabilities include high energy (0.5 – 20 MeV) neutron transmission (at 100 meters) and high energy neutron scattering (at 30 meters) using proton recoil detectors. The scattering system consists of an array of detectors at specified angles around the sample, a digital data acquisition system and internally developed software to discriminate γs and neutrons using pulse shape analysis. A mid-energy (1 eV – 400 keV) Li-6 glass transmission detector is currently being constructed and tested at 100 meters. The laboratory also hosts a 66 metric-ton lead slowing down spectrometer (LSDS). In transmission, new measurements include the total high energy cross section of elemental zirconium and titanium which resolve structure not seen in the evaluations. Filtered neutron beams are also being used which enable high accuracy measurements of smooth transmission cross sections in the energy range from 24 keV to 905 keV. Data from beryllium using this method was used to resolve discrepancies between evaluations of total cross section. Scattering measurements on carbon, molybdenum, and beryllium have been completed. Uranium-238 resonance scattering was measured and a new scatteringkernel for MCNP was verified. Low epi-thermal transmission (0.01 eV to 2 keV) and capture (1 - 600 eV) measurements of europium-153 and elemental europium were performed in 2008. Resonance parameters of molybdenum have been determined from data using the multilevel Rmatrix Bayesian code SAMMY. Other materials which are being studied in the resonance region include rhodium, cadmium, rhenium, uranium-236, and dysprosium-164. The RPI LSDS was used for simultaneous measurements of fission cross section and fission fragments mass and energy distributions as a function of the incident neutron energy. To qualify the system, data for uranium- 235 and plutonium-239 were collected and agree with previous data. In addition, (n, α) and (n, p) detectors are being developed for use in the LSDS to measure small samples or samples with small cross sections. The authors have assigned to the International Atomic Energy Agency a non-exclusive, royalty-free licence to publish this paper.
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