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SUMMARY:CAN 59Ni SYNTHESIZED IN OB ASSOCIATIONS DECAY TO 59CO BEFORE BEING
  ACCELERATED TO COSMIC-RAY ENERGIES?
DTSTART;VALUE=DATE-TIME:20070705T143000Z
DTEND;VALUE=DATE-TIME:20070705T144200Z
DTSTAMP;VALUE=DATE-TIME:20260413T140017Z
UID:indico-contribution-359@cern.ch
DESCRIPTION:Speakers: BINNS\, W. R. (Washington University in St. Louis)\n
 Observations from the Cosmic Ray Isotope Spectrometer (CRIS) aboard NASA
 ’s Advanced\nComposition Explorer (ACE) have shown that all relevant gal
 actic cosmic ray isotopic\nratios measured are consistent with an OB-Assoc
 iation origin of galactic cosmic rays\n(GCRs). Additionally CRIS measureme
 nts of the isotopic abundances of 59Ni and 59Co\nhave shown that the 59Ni 
 has completely decayed into 59Co\, indicating a delay of\n>10^5 years betw
 een nucleosynthesis and acceleration. However\, it has been suggested\ntha
 t shocks generated from high-velocity Wolf-Rayet winds in the OB-Associati
 on\nenvironment must accelerate nuclei synthesized in nearby core-collapse
  SNe on a time\nscale short compared to the 59Ni lifetime of 7.6x10^4 year
 s. If this were the case\,\nit would imply that OB Associations could not 
 be the source of most galactic cosmic\nrays. In this paper\, we describe t
 he OB-Association history and environment and show\nthat the time scales f
 or acceleration are such that most 59Ni should be expected to\ndecay natur
 ally in that setting\, strengthening the argument that OB associations are
 \nthe likely source of a substantial fraction of galactic cosmic rays.\n\n
 https://indico.nucleares.unam.mx/event/4/session/89/contribution/359
LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn)
URL:https://indico.nucleares.unam.mx/event/4/session/89/contribution/359
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