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 MA: Nuclear Data in the Cosmos |
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Chair: Kay Kolos, LLNL Room: Hyatt Regency Hotel Celestin D |
Sunday, October 30, 2022 8:30AM - 9:06AM |
MA.00001: Planetary Nuclear Spectroscopy Invited Speaker: Patrick N Peplowski Measurements of gamma-ray and neutron emissions from planetary surfaces - collectively termed planetary nuclear spectroscopy - provide measurements of the elemental composition of near-surface materials. Previous nuclear spectroscopy investigations have enabled numerous discoveries about the formation and evolution of rocky worlds within our solar system, including the Moon, Mars, Mercury, and asteroids 433 Eros, 4 Vesta, and 1 Ceres. The mid 2020s will see a new generation of spectrometers launch to continue our exploration of the Moon, and to conduct new explorations the metallic asteroid 16 Psyche, Mars' moon Phobos, and Saturn's moon Titan. These instruments will provide the first laboratory-quality measurements from other solar system objects. This success has led to a new challenge, as the accuracy and quality of the underyling nuclear datasets used for interpreting the data are now the limiting factor in our ability to confidently report near-surface composition. A new collaboration between planetary scientists and nuclear physicists is required to address this challenge. I will provide an overview of planetary nuclear spectroscopy measurements, discuss the exciting upcoming science investigations across our solar system, and detail ongoing and needed nuclear data activities that are required to advance the field. |
Sunday, October 30, 2022 9:06AM - 9:42AM |
MA.00002: Effects of Space Radiation on Humans and Electronics Invited Speaker: Lawrence H Heilbronn The space radiation environment that presents a hazard to humans and electronics is complex, comprised of galactic cosmic rays, solar energetic particles, and trapped belt radiation. The range of ion species and energies range primarily from protons up to nickel with energies up to several TeV per nucleon. Particle fluences are great enough to pose risks to crew and electronics over extended missions, both from long-term exposure to GCR as well as acute effects from unshielded solar particle events. Long-term health effects considered by NASA include radiogenic cancers, cognitive impairment, detrimental heart function. Current calculations indicate that a three-year mission Mars will have integrated effective doses that exceed the career limits for crew, based upon a 3% increase in REID with a 95% confidence level. Effects to electronics from exposure include single-effect upsets, latch-ups, transients, burnouts, and gate ruptures, all of which are a function of the linear energy transfer of the ions incident on the device. A description of the effects to crew and electronics will be presented, along with a discussion of the current state of space radiation transport modeling and the nuclear data needs to further reduce the uncertainties in those model calculations. |
Sunday, October 30, 2022 9:42AM - 10:18AM |
MA.00003: Modeling of Space Radiation and Nuclear Data Invited Speaker: Zi-Wei Lin A brief overview will be given on the relations between space radiation models and nuclear data. I will compare several deterministic and Monte Carlo transport models in their predictions in typical space radiation environments including galactic cosmic rays and solar particle events. I will then discuss what nuclear cross section data are expected to most affect the assessment of the space radiation risk to astronauts from galactic cosmic rays. |
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