Estimating Cosmic-Ray Spectral Parameters from Simulated Detector Responses with Detector Design Implications

Details Estimating Cosmic-Ray Spectral Parameters from Simulated Detector Responses with Detector Design Implications Estimating Cosmic-Ray Spectral Parameters from Simulated Detector Responses with Detector Design Implications

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001nasa.workr....h&link_type=abstract

Technical Report, NASA/TP-2001-210962; M-1014; NAS 1.60:210962

Physics

Cosmic Rays, Maximum Likelihood Estimates, Spectrum Analysis, Radiation Detectors, Monte Carlo Method, Computerized Simulation

Scientific paper

A simple power law model consisting of a single spectral index (alpha-1) is believed to be an adequate description of the galactic cosmic-ray (GCR) proton flux at energies below 1013 eV, with a transition at knee energy (Ek) to a steeper spectral index alpha-2 > alpha-1 above Ek. The maximum likelihood procedure is developed for estimating these three spectral parameters of the broken power law energy spectrum from simulated detector responses. These estimates and their surrounding statistical uncertainty are being used to derive the requirements in energy resolution, calorimeter size, and energy response of a proposed sampling calorimeter for the Advanced Cosmic-ray Composition Experiment for the Space Station (ACCESS). This study thereby permits instrument developers to make important trade studies in design parameters as a function of the science objectives, which is particularly important for space-based detectors where physical parameters, such as dimension and weight, impose rigorous practical limits to the design envelope.

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