J/A+A/513/A61Neutron-induced astrophysical reaction rates (Panov+, 2010)

Neutron-induced astrophysical reaction rates for translead nuclei. Panov I.V., Korneev I.Yu., Rauscher T., Martinez-Pinedo G., Kelic-Heil A., Zinner N.T., Thielemann F.-K. <Astron. Astrophys. 513, A61 (2010)> =2010A&A...513A..61P (SIMBAD/NED BibCode)ADC_Keywords: Atomic physicsKeywords: nuclear reactions, nucleosynthesis, abundances - supernovae: general - stars: neutronAbstract: Neutron-induced reaction rates, including fission, are calculated in the temperature range 10^{8}≤T(K)≤10^{10}within the framework of the statistical model for targets with atomic number 84≤Z≤118 (from Po to Uuo) from the neutron to the proton drip-line. Four sets of rates have been calculated, utilizing - where possible - consistent nuclear data for neutron separation energies and fission barriers from Thomas-Fermi (TF), Extended Thomas-Fermi plus Strutinsky Integral (ETFSI), Finite-Range Droplet Model (FRDM) and Hartree-Fock-Bogolyubov (HFB) predictions. Tables of calculated values as well as analytic seven parameter fits in the standard REACLIB format are supplied. We also discuss the sensitivity of the rates to the input, aiming at a better understanding of the uncertainties introduced by the nuclear input.Description: The organization of Tables 3-6 with calculated rates for 24 different values of T_{9}is extremely simple - all data are in 8 columns. The columns give, in this order, the target element, the atomic mass number A of the target, the temperature in T_{9}, partition function of the target, neutron-induced fission rate for the ground state, neutron-induced fission rate with thermally populated target states, neutron capture rate for the ground state, neutron capture rate with thermally populated target states. The rates in Tables 3-6 were calculated on the basis of different mass and fission barrier predictions: ETFSI, TF and FRDM(masses)+TF(barriers), respectively (see main text of the paper for details). The fitting coefficients for the (n,g), (g,n), and neutron-induced fission rates (n,f) with different mass and fission-barrier predictions are placed in the Tables 7-18 (see example on how to use them in Appendix A of the main paper). The columns in Tables 7-18 are organized as follows: target element, atomic mass number A of the target, target charge number Z, the number of fitting curves i_{fit}, seven coefficients of the forward reaction a_i, and the mean square error for direct reactions. A value i_{{fit}}=0 means that there is only one seven-parameter set to fit the rate. Values i_{fit}>1 give the number of parameter sets which have to be added up to yield the final rate, i.e. the rate r is calculated as r={sum.on.i}r_{i}, with each r_{i}computed from the i-th parameter set and using Eq. r_{i}=exp(a0+a1/T9+a2/T9^{1/3}+a3*T9^{1/3}+a4*T9+a5*T9^{5/3}+a6*ln(T9)) (4).File Summary:

FileName Lrecl Records Explanations

ReadMe 80 . This file table3.dat 81 64032 (n,g) and (n,f) rates with ETFSI-predictions table4.dat 81 71760 (n,g) and (n,f) rates with TF-predictions table5.dat 81 70056 (n,g) and (n,f) rates with FRDM+TF-predictions table6.dat 81 31728 (n,g) and (n,f) rates with HFB14-predictions table7.dat 124 2662 Coefficients for (n,g)-rate fit, ETFSI table8.dat 124 2984 Coefficients for (n,g)-rate fit, TF table9.dat 124 2911 Coefficients for (n,g)-rate fit, FRDM+TF table10.dat 124 1468 Coefficients for (n,g)-rate fit, HFB14 table11.dat 124 2414 Coefficients for (g,n)-rate fit, ETFSI table12.dat 124 2948 Coefficients for (g,n)-rate fit, TF table13.dat 124 2875 Coefficients for (g,n)-rate fit, FRDM+TF table14.dat 124 1436 Coefficients for (g,n)-rate fit, HFB14 table15.dat 124 3288 Coefficients for (n,f)-rate fit, ETFSI table16.dat 124 3928 Coefficients for (n,f)-rate fit, TF table17.dat 124 3846 Coefficients for (n,f)-rate fit, FRDM+TF table18.dat 124 1448 Coefficients for (n,f)-rate fit, HFB14

Byte-by-byte Description of file(# headlines): table[3456].dat

Bytes Format Units Label Explanations

1- 2 A2 --- El Target element (corresponding to Z) 5- 7 I3 --- A Atomic mass number of the target 9- 11 I3 --- Z [84,118] Charge number of the target 15- 19 F5.2 GK T9 [0.10/10.00] Temperature 25- 33 E9.4 --- pf Partition function of the target 37- 46 E10.4 cm3/s/mol nf Neutron-induced fission rate for ground state 49- 58 E10.4 cm3/s/mol nf* Neutron-induced fission rate with thermally populated target states 61- 69 E9.4 cm3/s/mol ng Neutron capture rate for the ground state 73- 81 E9.4 cm3/s/mol ng* Neutron capture rate with thermally populated target states

Byte-by-byte Description of file(# headlines): table[789].dat table1?.dat

Bytes Format Units Label Explanations

1- 2 A2 --- El Target element (corresponding to Z) 5- 7 I3 --- A Atomic mass number of the target 10- 12 I3 --- Z [84,118] Charge number of the target 15 I1 --- i [0/1] Number of fitting curve (1) 18- 30 E13.7 --- a0 Coefficient a0 of the forward reaction r_i_ (1) 32- 44 E13.7 --- a1 Coefficient a1 of the forward reaction r_i_ (1) 46- 58 E13.7 --- a2 Coefficient a2 of the forward reaction r_i_ (1) 60- 72 E13.7 --- a3 Coefficient a3 of the forward reaction r_i_ (1) 74- 86 E13.7 --- a4 Coefficient a4 of the forward reaction r_i_ (1) 88-100 E13.7 --- a5 Coefficient a5 of the forward reaction r_i_ (1) 102-114 E13.7 --- a6 Coefficient a6 of the forward reaction r_i_ (1) 118-124 E7.2 --- zeta ? Mean square error for direct reactions (Eq.(5))

Note (1): The rate r is calculated as r={Sum}r_{i}, and each r_{i}is computed as r_{i}= exp(a0+a1/T9+a2/T9^{1/3}+a3*T9^{1/3}+a4*T9+a5*T9^{5/3}+a6*ln(T9)). When i=0, there is a single seven-parameter set to fit the rate.

Acknowledgements: Igor Panov, Igor.Panov(at)itep.ruReferences: Panov, Kolbe, Pfeiffer, Rauscher, Kratz, & Thielemann, 2005NuPhA.747..633P Calculations of fission rates for r-process nucleosynthesis(End)Igor Panov [ITEP, Russia], Patricia Vannier [CDS] 21-Jan-2010

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