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J/A+A/342/881       Uncertainties in r-abundance distribution  (Goriely 1999)
Uncertainties in the solar system r-abundance distribution
     Goriely S.
    <Astron. Astrophys. 342, 881 (1999)>
    =1999A&A...342..881G
ADC_Keywords: Atomic physics

Keywords: nuclear reactions, nucleosynthesis, abundances - Sun: abundances -
          solar system: general - stars: abundances

Description:
    Tables 1&2 correspond to the first estimate of the error factors
    affecting the β decay rates of highly ionized heavy atoms in
    stellar environments. The uncertainties in the stellar β-decay
    and EC rates strongly depend on the relevance of the experimentally
    unknown transitions at a given temperature and density and the
    reliability of their evaluated probability. To estimate the
    temperature- and density-dependent errors on the β-decay rates,
    we have reiterated the Yokoi & Takahashi (1987, At. Data Nucl. Data
    Tables 36, 375) calculation with unknown transition rates modified by
    a typical error value of log(ft)=±0.5 (Takahashi 1998, private
    communication). No transition faster than log(ft)=5 is permitted in
    this error calculation. Newly measured transition probabilities, e.g.
    the allowed transition in the 187Re bound-state β-decay (Bosch
    et al., 1996PhRvL..77.5190B), have been considered. Minimum and
    maximum error factors around the published rates of Yokoi & Takahashi
    (1987) are given in Tables 1 and 2 at temperatures 1≤T8≤4 and
    electronic densities (expressed in terms of 1026cm-3 of
    1≤Ne≤30. When the density-dependence does not affect the final
    uncertainty factor by more than 0.10 between the Ne=1 and 3 cases,
    only values at Ne=10 are given in the tables. Note that an increase
    of transition probability by log(ft)=0.5 gives rise to an increase of
    the final rate by a maximum value of 3.16. This maximum variation is
    obtained for many rates. The derived error factors are used in
    parametric s-process calculations within the canonical multi-event
    model to estimate their impact on the predicted s-abundance
    distribution and the resulting uncertainties on the solar r-abundance
    distribution.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        49       70   Minimum and maximum error factors affecting the
                              β- decay rates of Yokoi & Takahashi
                              (1987, At. Data Nucl. Data Tables 36, 375)
table2.dat        49       38   Minimum and maximum error factors affecting the
                              β+ and EC rates of Yokoi & Takahashi
                              (1987, At. Data Nucl. Data Tables 36, 375)
tables.ps         72      606   PostScript version of the tables
tables.tex        89      158   LaTeX version of the tables


Byte-by-byte Description of file: table1.dat table2.dat

   Bytes Format Units     Label     Explanations

   1-  3  I3    ---       A         Atomic mass of the nucleus
   5-  6  A2    ---       Z         Symbol the element
   8-  9  I2    10+26cm-3 Ne        ? Electronic number density
  11- 14  F4.2  ---       f1Min     Minimum error factor for T=10+8K
  16- 19  F4.2  ---       f1Max     Maximum error factor for T=10+8K
  21- 24  F4.2  ---       f2Min     Minimum error factor for T=2*10+8K
  26- 29  F4.2  ---       f2Max     Maximum error factor for T=2*10+8K
  31- 34  F4.2  ---       f3Min     Minimum error factor for T=3*10+8K
  36- 39  F4.2  ---       f3Max     Maximum error factor for T=3*10+8K
  41- 44  F4.2  ---       f4Min     Minimum error factor for T=4*10+8K
  46- 49  F4.2  ---       f4Max     Maximum error factor for T=4*10+8K


Acknowledgements: Stephane Goriely 

(End)                                         Patricia Bauer [CDS]   26-Oct-1998