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Actinide R-Process Chronometers and β-Delayed Fission

  • F.-K. Thielemann
Part of the Astrophysics and Space Science Library book series (ASSL, volume 109)

Abstract

When including new predictions for β-delayed fission and neutron emission rates in an r-process calculation, the production ratios for 232Th/238U and 244Pu/238U are drastically lowered. Employing the chrono-metric pairs 232Th/238U 235U/238U 244Pu/238U and 129I/127I within a simple exponential model for chemical evolution of the Galaxy results in an age ranging roughly from 14 to 20×109. This is much larger than previous age determinations from actinide chronometers. Within the same model this value is consistant with predictions from the 187Re/187Os chronomet-ric pair and comparable with recent determinations of globular cluster ages and a Hubble constant of Ho < 70 km s-l Mpc-l. In more complex galactic evolution models the chronometers seem to lead to similar results, however, problems with the observed stellar age-metallicity relation are indicated.

Keywords

Production Ratio Fission Barrier Galactic Evolution Chemical Evolution Model Ground State Deformation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1984

Authors and Affiliations

  • F.-K. Thielemann
    • 1
  1. 1.Max-Planck-Institut für Physik und AstrophysikInstitut für AstrophysikGarching b. MünchenGermany

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