Direct Evidence of Energy-Loss in Electron-Capture-Decay Secondary Isotopes in the Heliosphere

Details Direct Evidence of Energy-Loss in Electron-Capture-Decay Secondary Isotopes in the Heliosphere Direct Evidence of Energy-Loss in Electron-Capture-Decay Secondary Isotopes in the Heliosphere

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3811s&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

We report direct evidence of the energy loss of galactic cosmic rays as they diffuse in magnetic irregularities expanding with the solar wind. Using the Cosmic Ray Isotop e spectrometer (CRIS) on the Advanced composition Explorer (ACE), we report on the energy-dep endence of the electron-capture decay of the secondary isotop es 49 V and 51 Cr. At the highest energies observed by CRIS, where electron attachment is unlikely, 49 V and 51 Cr are essentially stable; at lower energies the timescale for electron attachment is much shorter and substantial decay does occur. Comparing the energy dependence of the daughter/parent ratios 49 Ti/49 V and 51 V/51 Cr during periods of solar minimum and maximum demonstrates that the solar modulation parameter φ is about 400 to 700 MV higher during solar maximum than at minimum. Absolute values of φ inferred from these electron-capture-isotop e data agree well with values inferred from comparison of the observed elemental energy spectra with model calculations.

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