Revised Solar Cosmic Ray Fluxes Estimated Using Measured Depth Profiles of 14C in Lunar Rocks; the Importance of Good 14C Cross Section Determinations

Details Revised Solar Cosmic Ray Fluxes Estimated Using Measured Depth Profiles of 14C in Lunar Rocks; the Importance of Good 14C Cross Section Determinations Revised Solar Cosmic Ray Fluxes Estimated Using Measured Depth Profiles of 14C in Lunar Rocks; the Importance of Good 14C Cross Section Determinations

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1209s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1209

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14-Carbon Cross Sections, Cosmogenic Nuclides: Production, Rays: Cosmic, Rays: Solar Cosmic

Scientific paper

Long-lived radionuclides produced in lunar rocks by solar cosmic rays (SCR) preserve an historical record of the Sun's activity. SCR flux estimates over different time intervals can be made by using radionuclides with different half-lives. Knowing the solar proton flux in the past combined with modern direct measurements made with satellites results in better estimates of hazards that might be met in space missions. The SCR flux estimated over the time period characterized by the ^14C half life (5730 years) does not agree with those calculated using other radionuclides, and one possible explanation might be that the cross sections used in the calculation were incorrect. We present new values for the cross sections ^16 O(p,3p)^14C, Mg(p,x)^14C, and Fe(p,x)^14C at selected energies to add to those that we have reported before. Lunar rocks are usually 41-46% (by weight) oxygen, so it is very important to have good values for the cross section for the reaction ^16 O(p,3p)^14C, particularly near threshold. We present new values for this cross section and revised estimates for the SCR flux over the past 10,000 years.

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