Cosmic Ray Isotope Spectrometer
(CRIS)


for the Advanced Composition Explorer (ACE)

The Cosmic Ray Isotope Spectrometer provides measurements of the isotopes of galactic cosmic ray nuclei from helium to zinc over an energy range of about 100 to 500 MeV/nucleon. It consists of a Scintillating Optical Fiber Trajectory (SOFT) hodoscope that measures particle trajectory, and four identical stacks of large-area silicon solid-state detectors that make multiple measurements of the energy loss of the nuclei as they slow down and stop in the detector stack. These measurements can be used to determine the charge, mass, and total kinetic energy of stopping nuclei. The geometry factor of the instrument is about 300 cm ² sr.

CRIS photo stamp gif CRIS photo 175 KB GIF

CRIS is a new instrument that was developed by:


Caltech ACE/CRIS web page
Return to ACE home pageReturn to ACE Home Page
Author and Curator: Eric R. Christian (erc@cosmicra.gsfc.nasa.gov)
Responsible NASA Official: Tycho von Rosenvinge (tycho@lheamail.gsfc.nasa.gov)
A service of the Laboratory for High Energy Astrophysics (LHEA) at NASA's GSFC

  • Astronomy Questions? Ask a High Energy Astronomer.
  • NASA-specific Questions? Try the NASA Homepage or start at the NASA site map.
  • LHEA Web related Questions and Comments to: webmaster, Eunice Eng, eunice.eng@gsfc.nasa.gov

    NASA Website Privacy Statement | NASA IT Security Information

    This file was last modified on Thursday, 15-Feb-2001 11:50:24 EST