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.
Explore membership for yourself or for your organization.
Conference Spotlight
2026 ANS Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
Latest Magazine Issues
May 2026
Jan 2026
2026
Latest Journal Issues
Nuclear Science and Engineering
June 2026
Nuclear Technology
Fusion Science and Technology
Latest News
NRC proposes changes to its rules on nuclear materials
In response to Executive Order 14300, “Ordering the Reform of the Nuclear Regulatory Commission,” the NRC is proposing sweeping changes to its rules governing the use of nuclear materials that are widely used in industry, medicine, and research. The changes would amend NRC regulations for the licensing of nuclear byproduct material, some source material, and some special nuclear material.
As published in the May 18 Federal Register, the NRC is seeking public comment on this proposed rule and draft interim guidance until July 2.
Emil Beták, Ewa Droste, Stefan Mikolajewski, Wojciech Ratynski, Edward Rurarz, Tadeusz Kempisty, Subramanian Raman
Nuclear Science and Engineering | Volume 132 | Number 3 | July 1999 | Pages 295-307
Technical Paper | doi.org/10.13182/NSE99-A2064
Articles are hosted by Taylor and Francis Online.
Using 14.7-MeV neutrons and gamma-ray spectroscopy with high-purity germanium detectors, the activation cross sections have been measured for the following nuclear reactions: (a) 44Ca(n,p)44K, = (39 ± 4) mb; (b) 44Ca(n,np)43K, = (3.0 ± 0.3) mb; (c) 44Ca(n,)41Ar, = (31 ± 3) mb; (d) 42Ca(n,p)42K, = (138 ± 12) mb; (e) 43Ca(n,p)43K, = (90 ± 9) mb; and (f) 48Ca(n,2n)47Ca, = (613 ± 60) mb. A 98.6% enriched 44Ca target was used for reactions (a), (b), and (c) and a natural calcium target for reactions (d), (e), and (f). These cross sections have been compared with some earlier published experimental values and with some results of calculations. The latter include those based on semiempirical formulas and those given by the preequilibrium plus compound-nucleus code GNASH. When applied to reactions (a), (d), (e), and (f), this code gives cross-section values that are consistently above the measured values.
