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2014 ANNUAL REPORT 53 Creating two different sets of inde- pendent measurements will increase confidence in the results. This project has been funded in part by the DOE Office of Science in addition to the ATR NSUF and has been given the name MANTRA. It became an official ATR NSUF project in January 2010. Accomplishments The first two irradiations were completed in January 2013.The third and last sample irradiation was completed in January 2014 after two cycles in ATR. Under neutron irradia- tion these isotopes transmute into other isotopes and even though the number of transmutation products at the end of the irradiation is relatively small it is sufficient to infer the neutron capture cross-section if the measurements are precise enough. Measurements of isotopic ratios in most of the samples were finalized in 2014 using the Multi-Collector Induc- tively Coupled Plasma Mass Spectrom- eter MS-ICP-MS.This project was very successful with about 65 samples initial irradiated characterized in a relatively short period of time.All the isotopic ratios of interest have an associated 2-sigma uncertainty of less than 1. The measurements showed that after irradiation less than 1 of the initial material was transmuted when the 5-mm B filter was used whereas up to 25 was transmuted when the Cd filter was used.This was expected as the capture reaction rates in the resonance region seen by the Cd-filtered samples are higher than those in the faster neutron region seen by the 5-mm B-filtered samples.The detailed ATR as-run calculations using the Monte Carlo N-Particle MCNP code proved more challenging than originally thought however signifi- cant progress was made in 2014. In particular Jim Sterbentz the analyst in charge as well as Idaho State University ISU Ph.D. student Jyothier Kumar Nimmagadda showed that a detailed modeling of the neutron self-shielding found in some of the samples is crucial to reproducing the physical phenomena during irradia- tion.This will complicate the calcula- tions and will require a more detailed model than was originally planned. These analyses will be completed in 2015 and will allow us to start interacting with the nuclear data community and in particular the evaluators in charge of the nuclear data files. In April 2014 based on the recommendations of INL Fellow Pino Palmiotti this work was presented to the Organisaton for Economic Co-operation and Developments Nuclear Energy Agency OECDNEA Expert Group on Improvement of Integral Experiment Data for Minor This experiment is unique in the sense that it will provide a consistent set of neutron cross-sections in fast and epithermal neutron spectra for most isotopes of interest to reactor physics. GillesYouinou INL Principal Investigator