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
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Remembering ANS member Gil Brown
Brown
The nuclear community is mourning the loss of Gilbert Brown, who passed away on July 11 at the age of 77 following a battle with cancer.
Brown, an American Nuclear Society Fellow and an ANS member for nearly 50 years, joined the faculty at Lowell Technological Institute—now the University of Massachusetts–Lowell—in 1973 and remained there for the rest of his career. He eventually became director of the UMass Lowell nuclear engineering program. After his retirement, he remained an emeritus professor at the university.
Sukesh Aghara, chair of the Nuclear Engineering Department Heads Organization, noted in an email to NEDHO members and others that “Gil was a relentless advocate for nuclear energy and a deeply respected member of our professional community. He was also a kind and generous friend—and one of the reasons I ended up at UMass Lowell. He served the university with great dedication. . . . Within NEDHO, Gil was a steady presence and served for many years as our treasurer. His contributions to nuclear engineering education and to this community will be dearly missed.”
J. I. Katz
Nuclear Science and Engineering | Volume 168 | Number 2 | June 2011 | Pages 164-171
Technical Paper | doi.org/10.13182/NSE10-19
Articles are hosted by Taylor and Francis Online.
This paper reviews measurements of fission cross sections of short-lived nuclear states, summarizes the formidable experimental difficulties involved, and suggests novel methods of overcoming some of those difficulties. It is specifically concerned with the two such states that have been well characterized, the J = 1/2+ (26-min) isomeric 235mU and the J = 1- (16-h) ground state (shorter lived than the isomer) 242gsAm, and with measuring their fission cross sections at mega-electron-volt energies. These measurements are formidably difficult, partly because of the need to produce, separate, and collect the short-lived states before they decay and partly because of their comparatively small fission cross sections at these energies. This paper presents quantitative calculations of the efficiency of advection of recoiling 235mU isomers by flowing gas in competition with diffusive loss to the surface containing the mother 239Pu, and it reports the initial development and evaluation of some of the methods that must be developed to make the experiments feasible.