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pro vyhledávání: '"Lawrence, David J."'
The large-scale magnetic structure of interplanetary coronal mass ejections (ICMEs) has been shown to cause decreases in the galactic cosmic ray (GCR) flux measured in situ by spacecraft, known as Forbush decreases (Fds). We use measurements of the G
Externí odkaz:
http://arxiv.org/abs/2212.02707
Autor:
Hirata, Kaori, Usui, Tomohiro, Hyodo, Ryuki, Genda, Hidenori, Fukai, Ryota, Lawrence, David J., Chabot, Nancy L., Peplowski, Patrick N., Kusano, Hiroki
Publikováno v:
In Icarus 1 March 2024 410
Autor:
Burks, Morgan, Friedrich, Stephan, Goldsten, John, Heffern, Lena, Hines, Nathan, Kim, Geon-Bo, Lawrence, David J., Mozin, Vladimir, Peplowski, Patrick
Publikováno v:
In Planetary and Space Science January 2024 240
Autor:
Wilson, Jack T., Lawrence, David J., Peplowski, Patrick N., Eke, Vincent R., Kegerreis, Jacob A.
We use data from the Lunar Prospector Neutron Spectrometer to make the second space-based measurement of the free neutron lifetime finding $\tau_n=887 \pm 14_\text{stat}{\:^{+7}_{-3\:\text{syst}}}$ s, which is within 1$\sigma$ of the accepted value.
Externí odkaz:
http://arxiv.org/abs/2011.07061
Free neutrons have a measured lifetime of 880 s, but disagreement between existing laboratory measurements of ~10 s have persisted over many years. This uncertainty has implications for multiple physics disciplines, including standard-model particle
Externí odkaz:
http://arxiv.org/abs/2011.06095
Autor:
Wilson, Jack T., Lawrence, David J., Peplowski, Patrick N., Eke, Vincent R., Kegerreis, Jacob A.
Publikováno v:
Phys. Rev. Research 2, 023316 (2020)
We establish the feasibility of measuring the neutron lifetime via an alternative, space-based class of methods, which use neutrons generated by galactic cosmic ray spallation of planets' surfaces and atmospheres. Free neutrons decay via the weak int
Externí odkaz:
http://arxiv.org/abs/2006.10008
A defining characteristic of the planet Venus is its thick, CO2-dominated atmosphere. Despite over fifty years of robotic exploration, including thirteen successful atmosphere probes and landers, our knowledge of N2, the second-most-abundant compound
Externí odkaz:
http://arxiv.org/abs/1911.05598
Autor:
Lynch, Abigail J, Thompson, Laura M, Beever, Erik A, Cole, David N, Engman, Augustin C, Hoffman, Cat Hawkins, Jackson, Stephen T, Krabbenhoft, Trevor J, Lawrence, David J, Limpinsel, Douglas, Magill, Robert T, Melvin, Tracy A, Morton, John M, Newman, Robert A, Peterson, Jay O, Porath, Mark T, Rahel, Frank J, Schuurman, Gregor W, Sethi, Suresh A, Wilkening, Jennifer L
Publikováno v:
Frontiers in Ecology and the Environment, 2021 Oct 01. 19(8), 461-469.
Externí odkaz:
https://www.jstor.org/stable/27091502
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Autor:
Wilson, Jack T., Lawrence, David J., Peplowski, Patrick N., Cahill, Joshua T. S., Eke, Vincent R., Massey, Richard J., Teodoro, Luis F. A.
We present improved resolution maps of the Lunar Prospector Neutron Spectrometer thermal, epithermal and fast neutron data and Gamma-Ray Spectrometer Th-line fluxes via global application of pixon image reconstruction techniques. With the use of mock
Externí odkaz:
http://arxiv.org/abs/1802.09508