A systematic study of t the extraction of spectroscopic factors for the (p, d) reaction on light nuclei and the difficulties encountered in obtaining reasonable distorted-wave Born approximation (DWBA) fits to the shapes of the angular distributions has been made. Deuteron spectra and angular distributions were measured for the 1G 0(p, d) 15 0 reaction for 21. 27-, 25.52-, 31.82-, 38.63-, and 45.34-MeV incident protons. The elastic scattering of protons from 16 0 was measured over the same energy range and used to obtain proton opticalmodel parameters. Present results indicate that consistent spectroscopic information can be obtained from DWBA calculations when the deuterons in the exit channel have an energy greater than 20 MeV. Approximately 30% of the 1^3/2 strength appears to be missing from the 6.18-MeV, f~ level of 15 0, and a large fraction of that strength appears in the 9.60-and 10.46-MeV levels. Small 2s-ld admixtures were observed in the ground state of 16 0, and excitation of a J + level is observed. This excitation is a possible candidate for a two-step excitation process.
As part of the U.S. nonproliferation effort, we are investigating the conversion of the production
of fission-product 99Mo from use of high-enriched uranium (HEU) to low-enriched uranium (LEU).
Successful conversion from HEU to LEU (<20% 235U) requires an irradiation target that contains
5 times more uranium but minimizes changes to target geometry and processing. The LEU target
being developed uses thin foils of uranium metal that can be removed from the target hardware
for dissolution and processing. This paper describes our recent successes in target fabrication,
irradiation, and processing. Target fabrication has been improved by (1) heat-treating the
uranium foil to produce a random, small-grain structure and (2) electrodepositing zinc and nickel
fission-fragment barriers onto the foil. These fission-fragment barriers have been found to be
stable during transport of the targets following irradiation. Recent irradiation tests have shown
that the concept is sound. Progress was also made in broadening international cooperation in
our development activities.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.