LA-UR-13-25136 Approved for public release; distribution is unlimited. Title: Calculating alpha-Eigenvalue Spectra with Monte Carlo Author(s): Betzler, Benjamin R. Kiedrowski, Brian C. Brown, Forrest B. Martin, William R. Intended for: ANS Nuclear Criticality Safety Division Topical 2013, 2013-09-29 (Wilmington, North Carolina, United States) Issued: 2013-07-10 Disclaimer: Los Alamos National Laboratory, an affirmative action/equal opportunity employer,is operated by the Los Alamos National Security, LLC for the National NuclearSecurity Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. By approving this article, the publisher recognizes that the U.S. Government retains nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or to allow others to do so, for U.S. Government purposes. Los Alamos National Laboratory requests that the publisher identify this article as work performed under the auspices of the U.S. Departmentof Energy. Los Alamos National Laboratory strongly supports academic freedom and a researcher's right to publish; as an institution, however, the Laboratory does not endorse the viewpoint of a publication or guarantee its technical correctness.