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Abundances of neutron-capture elements in stars of the Galactic disk substructures (2013)
Journal Article
Mishenina, T. V., Pignatari, M., Korotin, S. A., Soubiran, C., Charbonnel, C., Thielemann, F., …Basak, N. Y. (2013). Abundances of neutron-capture elements in stars of the Galactic disk substructures. Astronomy and Astrophysics, 552, A128. https://doi.org/10.1051/0004-6361/201220687

Aims. The aim of this work is to present and discuss the observations of the iron peak (Fe, Ni) and neutron-capture element (Y, Zr, Ba, La, Ce, Nd, Sm, and Eu) abundances for 276 FGK dwarfs, located in the Galactic disk with metallicity-1 < [Fe/H]... Read More about Abundances of neutron-capture elements in stars of the Galactic disk substructures.

Production of carbon-rich presolar grains from massive stars (2013)
Journal Article
Pignatari, M., Wiescher, M., Timmes, F., De Boer, R. J., Thielemann, F. K., Fryer, C., …Hirschi, R. (2013). Production of carbon-rich presolar grains from massive stars. Astrophysical journal. Letters, 767(2), Article L22. https://doi.org/10.1088/2041-8205/767/2/L22

About a year after core-collapse supernova, dust starts to condense in the ejecta. In meteorites, a fraction of C-rich presolar grains (e.g., silicon carbide (SiC) grains of Type-X and low density graphites) are identified as relics of these events,... Read More about Production of carbon-rich presolar grains from massive stars.

Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis (2013)
Journal Article
Wallner, A., Vlastou, R., Vlachoudis, V., Vermeulen, M. J., Versaci, R., Ventura, A., …Variale, V. (2013). Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis. Physical review letters, 110(2), Article 022501. https://doi.org/10.1103/physrevlett.110.022501

The Ni63(n,γ) cross section has been measured for the first time at the neutron time-of-flight facility n-TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged c... Read More about Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis.

The 12C +12C reaction and the impact on nucleosynthesis in massive stars (2012)
Journal Article
Pignatari, M., Hirschi, R., Wiescher, M., Gallino, R., Bennett, M., Beard, M., …X. Timmes, F. (2013). The 12C +12C reaction and the impact on nucleosynthesis in massive stars. The Astrophysical journal, 762(1), Article 31. https://doi.org/10.1088/0004-637X/762/1/31

Despite much effort in the past decades, the C-burning reaction rate is uncertain by several orders of magnitude, and the relative strength between the different channels 12 C( 12 C, α) 20 Ne, 12 C( 12 C, p) 23 Na, and 12 C( 12 C, n) 23 Mg is poorly... Read More about The 12C +12C reaction and the impact on nucleosynthesis in massive stars.

17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process (2012)
Journal Article
Best, A., Görres, J., Beard, M., Couder, M., deBoer, R., Falahat, S., …Wiescher, M. (2012). 17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process. AIP conference proceedings, 1498, 309-313. https://doi.org/10.1063/1.4768509

The ratio of the reaction rates of the competing channels 17 O(αγ) 21 Ne and 17 O(α,n) 20 Ne determines the efficiency of 16 O as a neutron poison in the s process in low metallicity rotating stars. It has a large impact on the element production, ei... Read More about 17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process.

The NuGrid Research Platform: A Comprehensive Simulation Approach for Nuclear Astrophysics (2012)
Journal Article
Pignatari, M., & Herwig, F. (2012). The NuGrid Research Platform: A Comprehensive Simulation Approach for Nuclear Astrophysics. Nuclear physics news : a publication of NuPECC and EPS-NPB, 22(4), 18-23. https://doi.org/10.1080/10619127.2012.710142

Since the seminal works by BBFH [1] and Cameron et al. [2] a lot of progress in our understanding of the formation of the elements in stars has been made. Increasing fidelity of spectroscopic observations of stellar abundances as well as high-precis... Read More about The NuGrid Research Platform: A Comprehensive Simulation Approach for Nuclear Astrophysics.

The i-process and CEMP-r/s stars
Presentation / Conference
Ritter, C., Dardelet, L., Prado, P., Heringer, E., Higgs, C., Sandalski, S., …Venn, K. The i-process and CEMP-r/s stars. Presented at Proceedings of Science

© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. We investigate whether the anomalous elemental abundance patterns in some of the C-enhanced metal-poor-r/s (CEMP-r/s) stars are c... Read More about The i-process and CEMP-r/s stars.

Catching element formation in the act
Other
Fryer, C. L., Timmes, F., Hungerford, A. L., Couture, A., Adams, F., Aoki, W., …Pignatari, M. (2019). Catching element formation in the act

Gamma-ray astronomy explores the most energetic photons in nature to address some of the most pressing puzzles in contemporary astrophysics. It encompasses a wide range of objects and phenomena: stars, supernovae, novae, neutron stars, stellar-mass b... Read More about Catching element formation in the act.