TALYS prediction of astrophysical reaction rates for nuclei with Z=8-110

The present estimates of thermonuclear reaction rates are obtained with the reaction code called TALYS [1,2,3]. TALYS includes many state-of-the-art nuclear models to cover all main reaction mechanisms encountered in light particle-induced nuclear reactions. TALYS provides a complete description of all reaction channels and observables and in particular takes into account all types of direct, pre-equilibrium, and compound mechanisms to estimate the total reaction probability as well as the competition between the various open channels.

The code is optimized for incident projectile energies, ranging from 1 keV up to 200 MeV on target nuclei with mass numbers between 12 and 339. It includes photon, neutron, proton, deuteron, triton, 3He, and α-particles as both projectiles and ejectiles, and single-particle as well as multi-particle emissions and fission. The TALYS code was designed to calculate total and partial cross sections, residual and isomer production cross sections, discrete and continuum γ-ray production cross sections, energy spectra, angular distributions, double-differential spectra, as well as recoil cross sections. TALYS also estimates the maxwellian-averaged reaction rates [3].

All experimental information on nuclear masses, deformation, and low-lying states spectra is considered, whenever available (in particular the RIPL2 [4] and RIPL3 [5] databases). If not, various local and global input models have been incorporated to represent the nuclear structure properties, optical potentials, level densities, γ-ray strengths, and fission properties. Such nuclear models are based as much as possible on microscopic or semi-microscopic approaches which are believed to be of higher reliability due to their sound physical description and therefore better suited for extrapolation far away from experimentally known regions of the nuclear chart. In addition, these microscopic models have been shown to predict experimental data with the same degree of accuracy as the more phenomenological models traditionally used for practical applications. More specifically, when experimental data is not available, the present compilation of TALYS reaction rates makes use of the following global models

1) Nuclear structure, i.e

a) nuclear structure properties (masses, deformations) from the Hartree-Fock-Bogolyubov (BSkG3) mass model [6]. Details on the BSkG3 mass model can be found HERE.
b) nuclear level densities (NLD) from combinatorial model of Ref. [7] based on the deformed single-particle level scheme and pairing properties predicted by the HFB-14 mass model [8]. Details on the Nuclear Level Density can be found HERE
c) fission properties based on the HFB-14 model, including the full fission path and the NLD at the fission saddle points determined coherently with the ground-state NLD. All details can be found in Ref. [9] and the corresponding properties HERE

2) Interaction properties, i.e

a) nucleon-nucleus optical potential [10].
b) Alpha-nucleus optical model potential [11]
c) E1 and M1 photon strength function from the D1M+QRPA calculation of Ref. [12]

TABLES OF TALYS RATES (last update: 14/09/2023):

The following tables includes the maxwellian-averaged rates for neutron-, proton- and 4He-capture, as well as Planck-averaged photoreaction rates for all nuclei with 8≤Z≤110 lying between the proton and the neutron drip lines. The rates are calculated for 28 temperatures ranging between 106K and 109K. All possible light-particle channels have been considered, but the tables include as ejectiles only neutron, proton, alpha-particle as well as 2 neutron emissions. For nuclei with Z≥78, the fission channel is also included. None of the rates in the present compilation have been estimated on the basis of the detailed balance relations. All details of the calculations are given in Ref. [3,9].

REFERENCES:

[1] A. J. Koning, S. Hilaire, S. Goriely, in TALYS: Modeling of nuclear reaction, 2023 European. Phys. J. A 59, 131 ; also available at http//www.talys.eu.

[2] A. J. Koning, S. Hilaire, M. Duijvestijn, 2008, Nuclear Data for Science and Technology, ed. O. Bersillon et al. (EDP Sciences), 211

[3] S. Goriely, S. Hilaire, A.J. Koning, 2008 Astronomy and Astrophysics 487, 767

[4] T. Belgya, O. Bersillon, R. Capote Noy, et al. 2006, Handbook for calculations of nuclear reaction data, RIPL-2, IAEA-Tecdoc-1506, also available at http://www-nds.iaea.or.at/ripl2/

[5] RIPL-3 Handbook “Parameters for Calculation of Nuclear Reactions of Relevance to Non-Energy Nuclear Applications”, 2009, IAEA-Tecdoc, in press, also available at http://www-nds.iaea.org/RIPL-3/

[6] G. Grams, W. Ryssens, G. Scamps, S. Goriely, 2023, Eur. Phys. J. A in press

[7] S. Goriely, S. Hilaire, A.J. Koning, 2008, Physical Review C78, 064307

[8] S. Goriely, M. Samyn, J.M. Pearson, 2007, Physical Review C75, 064312

[9] S. Goriely, S. Hilaire, A.J. Koning, S. Sin, R. Capote, 2009, Physics Review C79, 024612

[10] A.J. Koning, J.-P. Delaroche, 2003, Nucl. Phys. A713, 231

[11] P. Demetriou, C. Grama, S.Goriely, 2002, Nucl. Phys. A707, 253

[12] S. Goriely, S. Hilaire, S. Péru, K. Sieja, 2018, Phys. Rev. C98, 014327.