1. Nuclear Reaction Network Calculations: The Next Generation Brad Meyer Clemson University

3. John C. Calhoun

4. Fort Hill

5. Anna Maria Calhoun

6. Thomas Clemson

7. Farmer’s Hall

8. Tillman Hall

9. Outline Brief introduction to reaction networks and nuclear data needs libnucnet as an example of a next generation nuclear network Concern: nuclear database Proposal: nuclear theory HUB

10. www.webnucleo.org/home/movies/alpha_rich/mpg/abundance_histogram.mpg

11. Computing the abundances (or probabilities)

12. How we do it: finite difference in time

13. Courtesy of Peter Moller

14. The full network >4000 nuclear species 73364 in the current JINA reaclib database (excluding any other special reactions)

15. www.webnucleo.org/home/movies/r_process/mpg/abund_rprocess.mpg

16. www.webnucleo.org/home/movies/r_process/mpg/qse_rprocess.mpg

17. libnucnet as an example of the next generation of reaction networks

18. What is libnucnet? A C toolkit for storing and managing nuclear reaction network. Built on top of libxml (the gnome XML parser and toolkit) and gsl (the GNU scientific library). Released under the GNU General Public License. Available at http://www.webnucleo.org

19. History of libnucnet Original goal—online nucleosynthesis tool Problem—input over the web Solution—XML (eXtensible Markup Language) Libxml as input and output Libxml has powerful built-in data structures (lists, hashes, trees, etc.)—build new nucleosynthesis code on top of libxml Hashes provide easy access to data— particularly useful for experimentalists

20. Features of libnucnet Intrinsically 3-d Easily handles an arbitrary nuclear network (bbn to r- process), including (any number of) isomeric states Reactions are handled the way humans think about them: “c12 + he4  o16 + gamma” or “o15  n15 + positron + neutrino_e” Hierarchically structured Naturally uses xml as input (allows for schemas, stylesheets, xpath selection, etc.) Read and validate data across the web Allows for user-supplied screening, NSE correction factor functions, and rate fit functions.

21. Structure of libnucnet Libnucnet__Nuc.c/h: a collection of nuclei –Libnucnet__Species: a species –Libnucnet__Nuc: a collection of species Libnucnet__Reac.c/h: a collection of nuclear reactions –Libnucnet__Reaction: a reaction –Libnucnet__Reac: a collection of reactions Libnucnet.c/h: a network and a collection of zones –Libnucnet__Net: a Libnucnet__Nuc + Libnucnet__Reac –Libnucnet__Zone: a physical zone –Libnucnet: a network plus a collection of zones

22. XML Data for the nuclear collection 0 1 Tuli (2000) 8.071 0.5 0.01 0 0.15 0 …

23. XML Data for the nuclear collection (with states) 13 26 Tuli (2000) + Gupta and Meyer (2001) -12.21 5... Tuli (2000) + Gupta and Meyer (2001) -11.982 0,,,

24. XML Data for Reactions—a rate table h2 + gamma --> Smith et al. (1993) h1 n h2 gamma 0.001 4.6168E+04 1.000 … ….

25. XML Data for Reactions—a single rate f19 + electron + anti-neutrino_e --> Nuclear Data tables o19 f19 electron anti-neutrino_e 1.6251e-01

26. XML Data for Reactions—a non- smoker fit ne16 + gamma -> ADNDT (2001) 75, 1 (non-smoker) ne15 n ne16 gamma 10 15 10 16 8.071000 0.0000 0.0100 1.900000e-06 6.225343e+00 1.023384e-02 -1.272184e+00 3.920127e+00 -1.966720e-01 1.394263e-02 -1.389816e+00 2.983430e+01

27. Zone data 0 1 0.5 0.5 …

28. ρ i = 10 8 g/cc, τ=0.1 s, Ye = 0.417

30. 26 Mg(alpha,n) 29 Si rate x 3 Hoppe, BSM, et al. (2009)

31. Fedkin, BSM, and Grossman (2010)

32. Future of nuclear data for reaction network calculations Reaction data—JINA reaclib database in libnucnet xml format Nuclear data????

33. Where I’m headed Study nuclear network equilibria (NSE, QSE, etc.)  libnuceq Build a multi-zone Galactic chemical evolution network on top of libnucnet.

34. nanoHUB.org

35. HUBzero http://hubzero.org/tour

36. The HUBZero Consortium

37. Deploying a Tool http://nanohub.org/resources/3863

38. Outline Brief introduction to reaction networks and nuclear data needs libnucnet as an example of a next generation nuclear network Concern: nuclear database Proposal: nuclear theory HUB