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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 703 records · Page 39
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

Impacts of processing decisions on TNSL cross sections and their applications

Thermal neutron scattering law (TNSL) data describe low-energy neutrons scattering off of bound materials, and can have a significant impact on modeling any system with slow neutrons, including nuclear reactors. Previous work to introduce TNSL data to neutron transport codes at LLNL focused on COG and TART, with the limitation that these codes require highly specialized data processing and formatting. We have recently increased efforts to process TNSL data with the LLNL nuclear data processing code FUDGE. FUDGE reads and writes the evaluated and processed files using the generalized nuclear database structure (GNDS). This process uncovered some significant difficulties in processing TNSL data, and unearthed assumptions made in current TNSL data processing that we have found inadequate. (authors)

22 GENERAL STUDIES OF NUCLEAR REACTORS↗
DOE OSTI2020

Regional Geologic Cross Sections for Potential Storage and Containment Zones in the MRCSP Region [plus Plates 1-6]

The regional characterization work conducted by the Geoteams during the MRCSP Phase III project period (2010 –2019) focused on the following tasks: (1) refinement of geologic seals/reservoir systems; (2) assessment of Atlantic Coastal Plain and offshore opportunities; (3) expanded assessments of oil and gas fields, particularly as they relate to enhanced recovery opportunities; (4) regional support for implementation of carbon capture utilization and storage (CCUS) in the partnership area; and (5) communication and data sharing. This report, entitled Regional Geology, has been prepared in association with (4), regional support for implementation of CCUS in the partnership area..

58 GEOSCIENCES↗
DOE OSTI2026

A Short-Lived Isotope Counting System (SLICS) to measure reaction cross sections producing light, beta-decaying nuclei on OMEGA

A new activation detector optimized for short-lived isotopes was designed, installed, and tested on OMEGA. The Short-Lived Isotope Counting System (SLICS) can be positioned as close as 35 cm from the OMEGA target chamber center in a ten-inch-manipulator. Stable target samples can be mounted on the front end of the detector assembly to undergo triton-, deuteron-, or neutron-induced reactions that produce short-lived reaction products that beta decay. The emitted betas are detected in a phoswich configuration to eliminate the gamma background. The detector is optimized for isotopes with half-lives from 150 ms to 20 s, filling a gap in OMEGA’s current activation detectors for isotopes with half-lives >5 min. In a pilot study, SLICS achieved an efficiency of 24.5% ± 2.0% for counting 8Li, with a total of 505.8 ± 4.4 qualifying events. Using the existing triton laser-ion acceleration platform on OMEGA, this detector can be used to measure rarely studied tritium-induced reactions on light nuclei with an estimated uncertainty of 12%. As a result, the design of the detector and its performance during a first experiment employing deuterium as a surrogate will be discussed.

Beta spectrometry↗
DOE OSTI2022

Using Co-Moving Collisions in a Gear-Changing System to Measure Fusion Cross Sections

In this work we look at a pos­si­ble use for a sys­tem that col­lides beams mov­ing in the same di­rec­tion using a gear-chang­ing syn­chro­niza­tion method as a means of mea­sur­ing low en­ergy phe­nom­ena, such as fu­sion cross sec­tions. De­pend­ing on the en­er­gies used this process will allow for in­ter­ac­tions for any de­sired charge state of the tar­get nu­clei. Ear­lier con­cepts for low en­ergy in­ter­ac­tions to study fo­cused on beams cross­ing at an angle to give the low en­ergy in­ter­ac­tions, as well as gen­eral in­ves­ti­ga­tions of co­mov­ing col­li­sions. This pro­posal would use gear-chang­ing, a method in­volv­ing two dif­fer­ent har­monic num­bers of bunches in each col­lider ring, to have the same types of col­li­sions, with a lu­mi­nos­ity equal that of a head-on ma­chine. In this work we de­tail the de­sign con­sid­er­a­tions for such a ma­chine, lever­ag­ing ex­per­i­men­tal ex­pe­ri­ence with a co-mov­ing, gear-chang­ing sys­tem.

Nissen, E. A.↗