starlib: a next-generation reaction-rate library...
TRANSCRIPT
STARLIB: A Next-Generation
Reaction-Rate Library for Nuclear
Astrophysics
Anne L. Sallaska
C. Iliadis, A. E. Champagne
University of North Carolina, Chapel Hill/Triangle Universities Nuclear Laboratory
F. X. Timmes, S. Starrfield
Arizona State University
XII International Symposium on Nuclei in the Cosmos: Lunchtime Workshop
August 6. 2012
Introduction
• STARLIB: tabular reaction rate
library for stellar modelers. Includes:
– Uncertainties on rates
– Information to build realistic rate
probability density functions (PDFs)
• Structure based on Monte Carlo
method to calculate experimental
reaction rates
– Input: assign physically motivated PDF
to each nuclear physics parameter
– Output: the rate PDF
• Low, median, and high rates are defined
in a statistically rigorous manner
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Pro
bab
ility
f(x
) (a
rb. u
nits)
0
0.001
0.002
0.003
0.004
(a)
)-1 s-1 mol3
Reaction rate (cm
3 4 5 6C
um
ula
tive
pro
ba
bili
ty F
(x)
0
0.2
0.4
0.6
0.8
1
(b)84%
50%
16%
LR
MR
HR
STARLIB Library
• Header
– Chapter number,
interacting nuclei,
source, Q-value
• 3 columns
– Temperature
• 1 MK – 10 GK
– Rate
• Thermonuclear rate
[cm3 mol -1 s -1]
• Decay constant of
photodisintigration
or beta decay [s-1]
– Factor uncertainty
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Rate = em f .u. = es
all ingredients
for rate PDFP
rob
ab
ility
f(x
) (a
rb. u
nits)
0
0.001
0.002
0.003
0.004
(a)
)-1 s-1 mol3
Reaction rate (cm
3 4 5 6
Cum
ula
tive
pro
ba
bili
ty F
(x)
0
0.2
0.4
0.6
0.8
1
(b)84%
50%
16%
LR
MR
HR
f (x;m,s ) =
exp[-(ln x -m)2 / (2s 2 )]
s 2p x
starlib.physics.unc.edu
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• Rate Library
• Rate Calculator
• Details
Rate Library
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• Download entire
library
• Download subset
of library
• Display an
individual rate
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3 menu options to display
individual rate
Download entire library
Upload list of nuclei for
library subset
Option to chose archived
libraries
Click “?” to display
formatting examples
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STARLIB version
Reaction name
Source (hyperlinked)
Q value
Temperature
Rate
Factor uncertainty
Rate Calculator
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• Display our MC
input files
• Run MC on our
server
• Monitor
simulation
progress
• Download
output files
Preparing for the Simulation
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Repository for MC input
files
• Because of
formatting, we
recommend
editing an existing
file
Input file displayed here
Starting and Monitoring the
Simulation
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Enter email address to:
• Start simulation
• Monitor
simulation
• Access output
files
Monitoring the Simulation
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Job ID issued upon
submission
Monitor:
• Job ID
• Status
• Run time
• Progress
• Estimated time
remaining
Abort
* Upon completion, alert
email sent to address
provided *
Monitoring the Simulation and
Accessing Output Files
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• Monitor
simulation
• Access output
files
Access Files
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Files tagged with:
• Reaction name
• Job ID
• *.in: input
• *.out: output
• *.hist: binned PDF
• *.latex: output in
Latex format
Clean up files
Input and Output Files
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Iliadis et al., Nucl. Phys A841, 31 (2010).
Iliadis et al., Nucl. Phys A841, 251 (2010).
Reaction properties: masses,
Q-values, spins, etc.
Resonance properties: ER, wg, etc.
Upper limit properties: ER, Gp limit, etc.
Low rate Median rate High rate Lognormal
parameters:
m, s
Details
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Construction of library
Library formatting
All references and links to
original papers
Information on STALRIB
updates
Thank you!
starlib.physics.unc.edu
See Poster 242 for more details
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