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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
R. J. Onega, P. W. Forbes, A. K. Furr, A. Robeson
Nuclear Science and Engineering | Volume 32 | Number 1 | April 1968 | Pages 49-55
Technical Paper | doi.org/10.13182/NSE68-A18823
Articles are hosted by Taylor and Francis Online.
The kinetic equations for a heavy-water-moderated reactor have terms describing the production of neutrons in the photodisintegration of deuterons. A technique has been developed for the measurement of these short-lived delayed-photoneutron groups. A 235U target was placed in the center of a sphere of D2O and a chopped neutron beam from the VPI reactor was allowed to impinge on the target. The time for a revolution of the chopper varied from 86.4 to 0.463 sec in six steps and there are two pulses per revolution. The ratio of “beam-on” target time to “beam-off” target time is 1 to 16.5. During the beam-off time interval, the production rate of delayed neutron and delayed photoneutrons as a function of time was stored in a time base multichannel analyzer. The half-lives of two new delayed-photoneutron groups were determined to be 7.39 × 10−2 and 4.02 × 10−3 sec with relative abundances of 0.0292 and 0.170, respectively. The relative abundances represent the fractions of the delayed-neutron and delayed-photoneutron groups.