ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
General Kenneth Nichols and the Manhattan Project
Nichols
The Oak Ridger has published the latest in a series of articles about General Kenneth D. Nichols, the Manhattan Project, and the 1954 Atomic Energy Act. The series has been produced by Nichols’ grandniece Barbara Rogers Scollin and Oak Ridge (Tenn.) city historian David Ray Smith. Gen. Nichols (1907–2000) was the district engineer for the Manhattan Engineer District during the Manhattan Project.
As Smith and Scollin explain, Nichols “had supervision of the research and development connected with, and the design, construction, and operation of, all plants required to produce plutonium-239 and uranium-235, including the construction of the towns of Oak Ridge, Tennessee, and Richland, Washington. The responsibility of his position was massive as he oversaw a workforce of both military and civilian personnel of approximately 125,000; his Oak Ridge office became the center of the wartime atomic energy’s activities.”
Izumi Tsubone, Yutaka Nakajima, Yutaka Furuta, Yukinori Kanda
Nuclear Science and Engineering | Volume 88 | Number 4 | December 1984 | Pages 579-591
Technical Paper | doi.org/10.13182/NSE84-A18374
Articles are hosted by Taylor and Francis Online.
The neutron total cross sections of 181Ta and 238U have been obtained in the energy range from 24.3 keV to 1 MeV by means of neutron transmission measurements using the Japan Atomic Energy Research Institute Linac, The measurements were carried out with the iron-filtered neutron beam technique and the time-of-flight method, using an NE-110 plastic scintillator as a neutron detector at a 100-m station. For 238U, correction for the resonance self-shielding effect was taken into account below 270 keV by measuring the transmission of four samples of different thicknesses. By fitting average R matrix calculations to the observed total cross sections, the neutron strength functions Sℓ for p and d waves, and distant level parameters for s, p, and d waves were deduced to be: , and for 181Ta, and , and for 238U. The effective s-wave scattering radii were 7.90 ± 0.03 and 9.30 ± 0.04 fm for 181Ta and 238U, respectively.