Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p33c1781k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P33C-1781
Astronomy and Astrophysics
Astrophysics
[0994] Exploration Geophysics / Instruments And Techniques, [5200] Planetary Sciences: Astrobiology, [6225] Planetary Sciences: Solar System Objects / Mars, [7500] Solar Physics, Astrophysics, And Astronomy
Scientific paper
We demonstrate the measurement and inversion of gamma/neutron spectra for a detector concept featuring one high-density scintillator and one high-proton-content scintillator for the example of the Radiation Assessment Detector on-board NASA's Mars Science Laboratory. The applied inversion methods derive the original spectra without any strong assumptions of the functional behavior. Instrument response functions are obtained from Monte-Carlo simulations in matrix form with which the instrument response is treated as a set of linear equations. Using the response matrices we compare a constrained least squares minimization, a chi-squared minimization and a maximum likelihood method with underlying Poissonian statistics. We make no assumptions about the incident particle spectrum and the methods intrinsically satisfy the constraint of non-negative counts. We analyzed neutron beam measurements made at the Physikalisch Technische Bundesanstalt (PTB) and inverted the measurement data for both neutron and gamma spectra. Monte-Carlo-generated measurements of the expected Martian neutron/gamma spectra were inverted as well, here the maximum likelihood method with underlying Poissonian statistics produces significantly better results.
Bohm E.
Ehresmann Bent
Hassler Donald M.
Kharytonov Alexander
Koehler Jess
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