J/A+A/487/767 Improved predictions of nuclear reaction rates (Goriely+, 2008)
Improved predictions of nuclear reaction rates for astrophysics applications
with the TALYS reaction code.
Goriely S., Hilaire S., Koning A.J.
<Astron. Astrophys. 487, 767 (2008)>
=2008A&A...487..767G 2008A&A...487..767G
ADC_Keywords: Atomic physics
Keywords: nuclear Reactions - nucleosynthesis, abundances
Abstract:
Nuclear reaction rates of astrophysical applications are traditionally
determined on the basis of Hauser-Feshbach reaction codes. These codes
adopt a number of approximations that have never been tested, such as
a simplified width fluctuation correction, the neglect of delayed or
multiple-particle emission during the electromagnetic decay cascade,
or the absence of the pre-equilibrium contribution at increasing
incident energies.
The reaction code TALYS has been recently updated to estimate the
Maxwellian-averaged reaction rates that are of astrophysical
relevance. These new developments enable the reaction rates to be
calculated with increased accuracy and reliability and the
approximations of previous codes to be investigated.
Description:
The files (in "files" subdirectory) include the Maxwellian-averaged
nuclear reaction rates of astrophysical interest estimated with the
TALYS reaction code for 26 temperatures ranging between 1x107 to
1x1010K. The reaction rates include neutron, proton and α-
captures for all 8≤Z≤105 nuclei lying between the proton and
neutron drip lines. The reaction rates are filed per isotopic chain
and projectile type. For example z050n corresponds to the neutron
capture reaction rates of Z=50 (Sn) isotopes (in the file name n
stands for neutron captures, p for protons, a for α-particles).
For each projectile, the reaction rates for the three possible
ejectiles differing from the projectiles are included (g stands for
gamma). The target, projectile, ejectile and residual nuclei are given
in the title for each set of reaction rates. The temperature T (T9) is
expressed in billion degrees Kelvin and the reaction rates in
mol-1.s-1.cm3. The 294 corresponding files are also available in
one unique zipped tar file named zfile.tar (5.3Mb)
The file "rates.dat" contains all reaction rates in a single table.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rates.dat 92 416702 Maxwellian-averaged nuclear reaction rates
files/* . 294 Individual original files
zfile.tar 1016 448756 tar file of individual original files
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See also:
J/A+A/287/927 : Abundances for lines of n-capture in 19 stars (Gratton+ 1994)
J/AZh/81/209 : Neutron capture elements in stars: neodymium (Mashonkina+ 2004)
J/AZh/84/429 : Abundances in atmospheres of cool giants (Mishenina+, 2007)
J/AZh/84/997 : Neutron capture elements in halo+disk stars (Mashonkina+, 2007)
Byte-by-byte Description of file: rates.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- File Original file name (1)
7- 9 I3 --- A Mass number of the target nucleus
10- 11 A2 --- Z Symbol of the target nucleus
12 A1 --- --- [+]
13 A1 --- p [anp] projectile (2)
15- 17 A3 --- --- [(anp,] projectile
18 A1 --- e1 [agnp] ejectile in first reaction (2)
19 A1 --- --- [)]
20- 22 I3 --- A1 Mass number of the residual in first reaction
23- 24 A2 --- Z1 Symbol of the residual nucleus
27- 29 A3 --- --- [(anp,] projectile
30 A1 --- e2 [agnp] ejectile in second reaction (2)
31 A1 --- --- [)]
32- 34 I3 --- A2 Mass number of the residual nucleus
35- 36 A2 --- Z2 Symbol of the residual nucleus
39- 41 A3 --- --- [(anp,] projectile
42 A1 --- e3 [agnp] ejectile in third reaction (2)
43 A1 --- --- [)]
44- 46 I3 --- A3 Mass number of the residual nucleus
47- 48 A2 --- Z3 Symbol of the residual nucleus
50- 56 F7.4 10+9K T9 Temperature of the reaction
58- 68 E11.6 cm3/mol/s Rate1 Rate of reaction 1: A.Z (p,e1) A1.Z1
70- 80 E11.6 cm3/mol/s Rate2 Rate of reaction 2: A.Z (p,e2) A2.Z2
82- 92 E11.6 cm3/mol/s Rate3 Rate of reaction 3: A.Z (p,e3) A3.Z3
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Note (1): template "znnna" (nnn=008 to 105) where nnn is the atomic number
of isotope, and letter corresponds to projectile (a,n,p for
α-particle, neutron capture, proton, respectively).
Note (2): particle is n=neutron, p=proton, a=α, g=γ
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Acknowledgements:
Stephane Goriely, sgoriely(at)astro.ulb.ac.be
(End) S. Goriely [ULB-Belgium], Patricia Vannier [CDS] 03-Jun-2008