title: Global distribution of neutrons from Mars: results from Mars odyssey.
abstract: Global distributions of thermal, epithermal, and fast neutron fluxes have been mapped during late southern summer/northern winter using the Mars Odyssey Neutron Spectrometer. These fluxes are selectively sensitive to the vertical and lateral spatial distributions of H and CO2 in the uppermost meter of the martian surface. Poleward of +/-60 degrees latitude is terrain rich in hydrogen, probably H2O ice buried beneath tens of centimeter-thick hydrogen-poor soil. The central portion of the north polar cap is covered by a thick CO2 layer, as is the residual south polar cap. Portions of the low to middle latitudes indicate subsurface deposits of chemically and/or physically bound H2O and/or OH.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87545, USA. wfeldman@lanl.gov
authors.forename: W C
authors.initials: WC
authors.lastname: Feldman
authors.forename: W V
authors.initials: WV
authors.lastname: Boynton
authors.forename: R L
authors.initials: RL
authors.lastname: Tokar
authors.forename: T H
authors.initials: TH
authors.lastname: Prettyman
authors.forename: O
authors.initials: O
authors.lastname: Gasnault
authors.forename: S W
authors.initials: SW
authors.lastname: Squyres
authors.forename: R C
authors.initials: RC
authors.lastname: Elphic
authors.forename: D J
authors.initials: DJ
authors.lastname: Lawrence
authors.forename: S L
authors.initials: SL
authors.lastname: Lawson
authors.forename: S
authors.initials: S
authors.lastname: Maurice
authors.forename: G W
authors.initials: GW
authors.lastname: McKinney
authors.forename: K R
authors.initials: KR
authors.lastname: Moore
authors.forename: R C
authors.initials: RC
authors.lastname: Reedy
mesh_terms: D004367:Dry Ice; D005118:Extraterrestrial Environment; D005720:Gamma Rays; D006859:Hydrogen; D007053:Ice; D018535:Mars; D009502:Neutrons; D018531:Spacecraft; D013051:Spectrometry, Gamma; D013057:Spectrum Analysis; D013696:Temperature; D014867:Water
chemical_list: D004367:Dry Ice; D007053:Ice; D014867:Water; D006859:Hydrogen