773 research outputs found
Bose-Einstein condensate in gases of rare atomic species
We report on the successful extension of production of Bose-Einstein
Condensate (BEC) to rare species. Despite its low natural abundance of 0.13%,
Yb is directly evaporatively cooled down to BEC. Our successful
demonstration encourages attempts to obtain quantum gases of radioactive atoms,
which extends the possibility of quantum many-body physics and precision
measurement. Moreover, a stable binary mixture of Yb BEC and Yb
BEC is successfully formed.Comment: 5 pages, 3 figures. Accepted for Phys. Rev.
Prediction of Climate Change Impacts on Groundwater Storage by Analysis and Modeling of Hydrograph Recession Curves: Application to the Bar Watershed, Iran
Climate Change, Adaptation and Long-Term Prediction
Evaluation of low-level radioactive waste characterization and classification programs of the West Valley Demonstration Project
The West Valley Demonstration Project (WVDP) is preparing to upgrade their low-level radioactive waste (LLW) characterization and classification program. This thesis describes a survey study of three other DOE sites conducted in support of this effort. The LLW characterization/classification programs of Oak Ridge National Laboratory, Savannah River Site, and Idaho National Engineering Laboratory were critically evaluated. The evaluation was accomplished through tours of each site facility and personnel interviews. Comparative evaluation of the individual characterization/classification programs suggests the WVDP should purchase a real-time radiography unit and a passive/active neutron detection system, make additional mechanical modifications to the segmented gamma spectroscopy assay system, provide a separate building to house characterization equipment and perform assays away from waste storage, develop and document a new LLW characterization/classification methodology, and make use of the supercompactor owned by WVDP
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