Radionuclides in the galactic cosmic rays serve as chronometers for measuring the characteristic time of physical processes affecting cosmic ray energy spectra and composition. The radionuclide ^(59)Ni, present in the ejecta of supernovae, will decay to ^(59)Co via electron-capture with a halflife of T_(1/2) = 7.6 × 10^4 yr. However, if the cosmic ray acceleration time scale is shorter than the decay halflife, ^(59)Ni will become fully-stripped of electrons and will be present in the cosmic rays. Abundances of cosmic ray ^(59)Ni and ^(59)Co measured with the Cosmic Ray Isotope Spectrometer (CRIS) are consistent with the decay of all source ^(59)Ni, implying an acceleration time delay > 10^5 yr. Abundances of the β-decay radioactive secondar...
Context. Two main hypotheses for the origin of Galactic cosmic rays are the supernova and superbubbl...
The Cosmic Ray Isotope Spectrometer (CRIS) on the ACE spacecraft has been measuring the isotopic com...
Cosmic rays that are produced by nuclear interactions during propagation and decay only by electron ...
Radionuclides in the galactic cosmic rays serve as chronometers for measuring the characteristic tim...
Supernovae should produce the radioactive nuclide ^(59)Ni, and in the ejecta of the explosions these...
Galactic cosmic rays (GCRs) pass through the interstellar medium (ISM) and undergo nuclear interacti...
Measurements of the abundances of cosmic-ray ^(59)Ni and ^(59)Co are reported from the Cosmic-Ray Is...
We present measurements of the nickel and cobalt isotopes from the Cosmic Ray Isotope Spectrometer ...
Galactic cosmic rays (GCR) interact to produce secondary fragments as they pass through the interste...
There are a number of radioactive ‘clocks’ in the cosmic radiation that can be used to measure the t...
There are a number of radioactive ‘clocks’ in the cosmic radiation that can be used to measure the t...
We report on abundance measurements of ^(10)Be, ^(26)Al, ^(36)Cl, and ^(54)Mn in the Galactic cosmic...
The most reliable method to estimate the residence time of cosmic rays in the Galaxy is based on the...
Radioactive cosmic ray nuclei produced by nuclear interactions during cosmic ray propagation through...
Observations from the Cosmic Ray Isotope Spectrometer (CRIS) on ACE have been used to derive constra...
Context. Two main hypotheses for the origin of Galactic cosmic rays are the supernova and superbubbl...
The Cosmic Ray Isotope Spectrometer (CRIS) on the ACE spacecraft has been measuring the isotopic com...
Cosmic rays that are produced by nuclear interactions during propagation and decay only by electron ...
Radionuclides in the galactic cosmic rays serve as chronometers for measuring the characteristic tim...
Supernovae should produce the radioactive nuclide ^(59)Ni, and in the ejecta of the explosions these...
Galactic cosmic rays (GCRs) pass through the interstellar medium (ISM) and undergo nuclear interacti...
Measurements of the abundances of cosmic-ray ^(59)Ni and ^(59)Co are reported from the Cosmic-Ray Is...
We present measurements of the nickel and cobalt isotopes from the Cosmic Ray Isotope Spectrometer ...
Galactic cosmic rays (GCR) interact to produce secondary fragments as they pass through the interste...
There are a number of radioactive ‘clocks’ in the cosmic radiation that can be used to measure the t...
There are a number of radioactive ‘clocks’ in the cosmic radiation that can be used to measure the t...
We report on abundance measurements of ^(10)Be, ^(26)Al, ^(36)Cl, and ^(54)Mn in the Galactic cosmic...
The most reliable method to estimate the residence time of cosmic rays in the Galaxy is based on the...
Radioactive cosmic ray nuclei produced by nuclear interactions during cosmic ray propagation through...
Observations from the Cosmic Ray Isotope Spectrometer (CRIS) on ACE have been used to derive constra...
Context. Two main hypotheses for the origin of Galactic cosmic rays are the supernova and superbubbl...
The Cosmic Ray Isotope Spectrometer (CRIS) on the ACE spacecraft has been measuring the isotopic com...
Cosmic rays that are produced by nuclear interactions during propagation and decay only by electron ...