Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session PK: Mini-Symposium: Don't Look Up: Nuclear Data for Planetary Defense and Space Exploration
10:30 AM–12:18 PM,
Sunday, October 30, 2022
Hyatt Regency Hotel
Room: Imperial 5AB
Chair: Patrick Peplowski, Johns Hopkins University Applied Physics Lab
Abstract: PK.00002 : Precision measurements of neutron inelastic scattering cross sections for planetary nuclear spectroscopy*
11:06 AM–11:18 AM
Presenter:
Mauricio Ayllon Unzueta
(NASA Goddard Space Flight Center)
Authors:
Mauricio Ayllon Unzueta
(NASA Goddard Space Flight Center)
Patrick N Peplowski
(Applied Phys Lab/JHU)
Jack Wilson
(The Johns Hopkins University Applied Physics Laboratory)
Ann M Parsons
(NASA Goddard Space Flight Center)
Arun Persaud
(Lawrence Berkeley National Laboratory)
The quality of the data obtained by spectrometers of this kind is limited, in part, by the current state of nuclear databases, specifically capture (n,g) and inelastic scattering (n,n’g) cross sections. The latter has wider gaps and inconsistencies across the board because of several reasons including the lack of dedicated facilities and equipment that can produce energy-selective high-energy neutrons with low gamma ray background from scattered and thermal neutrons.
Associated Particle Imaging (API) is an attractive technique to measure inelastic scattering cross sections with high precision, which addresses some of the concerns outlined above for the following reasons:
1) An API deuterium-tritium (DT) neutron generator is a well characterized, quasi-monoenergetic 14.1 MeV neutron source.
2) Time tagging allows for the selective detection of prompt gamma emission only; ideal for measurements of neutron inelastic scattering followed by gamma emission.
3) Spatial resolution and 3D imaging allows for significant gamma background/contamination suppression when the irradiated sample is well isolated.
We will present and discuss initial results obtained from an experiment carried out with an API system at Lawrence Berkeley National Laboratory.
*This work was supported by the NASA Postdoctoral Program (NPP) and NASA's Planetary Science Division Internal Scientist Funding Model (ISFM) Program through the Fundamental Laboratory Research (FLaRe) package.
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