The Cosmic-Ray Isotope Spectrometer for the Advanced Composition Explorer |
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| Authors: | Stone EC Cohen CMS Cook WR Cummings AC Gauld B Kecman B Leske RA Mewaldt RA Thayer MR Dougherty BL Grumm RL Milliken BD Radocinski RG Wiedenbeck ME Christian ER Shuman S Trexel H von Rosenvinge TT Binns WR Crary DJ Dowkontt P Epstein J Hink PL Klarmann J Lijowski M Olevitch MA |
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| Institution: | (1) California Institute of Technology, Pasadena, CA, 91125, U.S.A.;(2) Jet Propulsion Laboratory, Pasadena, CA, 91109, U.S.A.;(3) NASA/Goddard Space Flight Center, Greenbelt, MD, 20771, U.S.A.;(4) Washington University, St. Louis, MO, 63130, U.S.A. |
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| Abstract: | The Cosmic-Ray Isotope Spectrometer is designed to cover the highest decade of the Advanced Composition Explorer's energy
interval, from ∼50 to ∼500 MeV nucl−1, with isotopic resolution for elements from Z≃2 to Z≃30. The nuclei detected in this
energy interval are predominantly cosmic rays originating in our Galaxy. This sample of galactic matter can be used to investigate
the nucleosynthesis of the parent material, as well as fractionation, acceleration, and transport processes that these particles
undergo in the Galaxy and in the interplanetary medium.
Charge and mass identification with CRIS is based on multiple measurements of dE/dx and total energy in stacks of silicon
detectors, and trajectory measurements in a scintillating optical fiber trajectory (SOFT) hodoscope. The instrument has a
geometrical factor of ∼r250 cm2 sr for isotope measurements, and should accumulate ∼5×106 stopping heavy nuclei (Z>2) in two
years of data collection under solar minimum conditions.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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