22Na, Ne–E, extinct radioactive anomalies and unsupported 40Ar

  title={22Na, Ne–E, extinct radioactive anomalies and unsupported 40Ar},
  author={Donald D. Clayton},
  • D. Clayton
  • Published 1 September 1975
  • Physics, Geology
  • Nature
A NEW picture1 of the origin of the known extinct radioactivities (129I and 244Pu) holds that these radioactive species were precipitated in grains forming in the rapidly cooling ejecta of explosive nucleosynthesis, and that their decay occurred in interstellar grains rather than in the meteorites. If so, our interpretation of extinct radioactivities is enlarged. Their detectability is no longer related to the usual criterion that they live long enough for the meteorites to form, but rather… 
Extinct [TSUP]44[/TSUP]Ti in Presolar Graphite and SiC: Proof of a Supernova Origin
Large excesses in 44Ca, from the radioactive decay of short-lived 44Ti, have been observed in four low-density graphite grains and five SiC grains of type X extracted from the Murchison meteorite.
Implications from the absence of a 41K anomaly in an Allende inclusion
CLAYTON1 has elaborated on his unorthodox interpretation2 of the occurrence in meteorites of the decay products of the extinct radionuclides 129I and 244Pu. He has suggested that these radioactive
Are supernovae sources of presolar grains?
ISOTOPIC measurements1 in chondritic meteorites have revealed that live 26Al was present in the early solar system. 26Al and other reported isotopic peculiarities2–4 in the meteorite Allende could be
Large amounts of extinct 26AI in interstellar grains from the Murchison meteorite
INTERSTELLAR graphite and silicon carbide grains recovered from the Murchison CM2 chondritic meteorite are known to show large anomalies in the isotopic abundances of neon, xenon, carbon, nitrogen
On presolar meteoritic sulphides
DISCOVERIES of isotopic anomalies in meteorites1–4 inspired those same research groups to postulate nucleosynthetic inhomogeneities that were somehow carried into the early Solar System. Clayton5,6
1.02 – Presolar Grains
Protostellar Cosmic Rays and Extinct Radioactivities in Meteorites
Calcium-aluminum-rich inclusions (CAIs) and chondrules of chondritic meteorites may originate with the melting of dustballs launched by a magnetically driven bipolar outflow from the inner edge of
Extinct nuclides - "Much ado about nothing"
A concise review of the status of research on short-lived nuclei is presented. The importance of these nuclei is very great in spite of the fact that they are essentially absent today (except for


Extinct Radioactivities: Trapped Residuals of Presolar Grains
The xenon anomalies trapped in meteorites and the Moon may have first been trapped in circumstellar grains formed in or outside of postexplosive stars. In that case, the initial solar nebula need not
Gamma-ray lines from novae
An appropriate gamma-ray telescope could detect the gamma-rays associated with radioactive decays. The observable lines would be the annihilation radiation following the positron emission of N-13,
On the e-process - Its components and their neutron excesses. [solar abundance calculations in gamma ray astronomy]
The pattern of abundances within the iron-abundance peak of the solar system is analyzed for various Cr, Fe, and Ni abundances, and a method is developed for finding the best fit to a given set of
Thermonuclear Origin of Rare Neutron-Rich Isotopes
Suppl. 3, 343 (1970). R. G. Brownlee, G. J. Chapman, S. A. David, A. J. Fisher, L. Horton, L. Goorevich, P. C. Kohn, C. B.A. McCusker, A. Outhred, A. F. Parkinson, L. S. Peak, M. H. Rathgeber, M. J.
Infrared emission of Novae
Nova Ser 1970 and Aql 1970 luminous IR emission, discussing stellar brightness, grain formation and optical decay