All Outputs (11)

Presolar SiC Grains of Type AB with Isotopically Light Nitrogen: Contributions from Supernovae? (2019)
Presentation / Conference Contribution
Hoppe, P., Pignatari, M., & Amari, S. (2019). Presolar SiC Grains of Type AB with Isotopically Light Nitrogen: Contributions from Supernovae?. Springer Proceedings in Physics, 219, 373-376. https://doi.org/10.1007/978-3-030-13876-9_68

Primitive solar system materials contain presolar grains that formed in the winds of evolved stars and in the ejecta of stellar explosions. Here, we report on NanoSIMS measurements of C-, N-, Al–Mg-, Si-, and S-isotopic compositions of 10 submicromet... Read More about Presolar SiC Grains of Type AB with Isotopically Light Nitrogen: Contributions from Supernovae?.

Heavy Elements Nucleosynthesis on Accreting White Dwarfs Surface: Seeding the p-Process (2019)
Presentation / Conference Contribution
Battino, U., Travaglio, C., Pignatari, M., & Lederer-Woods, C. (in press). Heavy Elements Nucleosynthesis on Accreting White Dwarfs Surface: Seeding the p-Process. Springer Proceedings in Physics, 219, 179-182. https://doi.org/10.1007/978-3-030-13876-9_29

© 2019, Springer Nature Switzerland AG. The production of the proton-rich isotopes beyond iron that we observe today in the solar system is still uncertain. Thermonuclear supernovae (SNe Ia) exploding within the single-degenerate scenario have been p... Read More about Heavy Elements Nucleosynthesis on Accreting White Dwarfs Surface: Seeding the p-Process.

Inhomogeneous Chemical Evolution of r-Process Elements in the Galactic Halo (2019)
Presentation / Conference Contribution
Wehmeyer, B., Fröhlich, C., Pignatari, M., & Thielemann, F. K. (in press). Inhomogeneous Chemical Evolution of r-Process Elements in the Galactic Halo. Springer Proceedings in Physics, 219, 91-96. https://doi.org/10.1007/978-3-030-13876-9_15

© 2019, Springer Nature Switzerland AG. The origin of the heaviest elements is still a matter of debate. For the rapid neutron capture process (“r-process”), multiple sites have been proposed, e.g., neutron star mergers and (sub-classes) of supernova... Read More about Inhomogeneous Chemical Evolution of r-Process Elements in the Galactic Halo.

H-He Shell Interactions and Nucleosynthesis in Massive Population III Stars (2019)
Presentation / Conference Contribution
Clarkson, O., Herwig, F., Andrassy, R., Woodward, P., Pignatari, M., & Mao, H. (in press). H-He Shell Interactions and Nucleosynthesis in Massive Population III Stars. Springer Proceedings in Physics, 219, 321-325. https://doi.org/10.1007/978-3-030-13876-9_56

© 2019, Springer Nature Switzerland AG. We report on our ongoing investigation into the nucleosynthetic and hydrodynamic nature of mixing at the interface between the H- and He-convection zones in massive Pop III stars. Studying recent a grid of 26 1... Read More about H-He Shell Interactions and Nucleosynthesis in Massive Population III Stars.

Inhomogeneous chemical evolution of r-process elements (2016)
Presentation / Conference Contribution
Wehmeyer, B., Pignatari, M., & Thielemann, F.-K. (2016). Inhomogeneous chemical evolution of r-process elements. AIP conference proceedings, 1743, https://doi.org/10.1063/1.4953301

We report the results of a galactic chemical evolution (GCE) study for r-process- and alpha elements. For this work, we used the inhomogeneous GCE model "ICE", which allows to keep track of the galactic abundances of elements produced by different as... Read More about Inhomogeneous chemical evolution of r-process elements.

Constraining the 12C+12C fusion cross section for astrophysics (2015)
Presentation / Conference Contribution
Bucher, B., Fang, X., Tang, X., Tan, W., Almaraz-Calderon, S., Alongi, A., …Wiescher, M. (2015). Constraining the 12C+12C fusion cross section for astrophysics. EPJ Web of Conferences, 93, 03009. https://doi.org/10.1051/epjconf/20159303009

The 12 C+ 12 C reaction is one of the single most important nuclear reactions in astrophysics. It strongly influences late evolution of massive stars as well as the dynamics of type Ia supernovae and x-ray superbursts. An accurate estimation of the c... Read More about Constraining the 12C+12C fusion cross section for astrophysics.

Experimental neutron capture data of 58Ni from the CERN n_TOF facility (2015)
Presentation / Conference Contribution
Žugec, P., Barbagallo, M., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., …Wright, T. (2015). Experimental neutron capture data of 58Ni from the CERN n_TOF facility. EPJ Web of Conferences, 93, 02009. https://doi.org/10.1051/epjconf/20159302009

The neutron capture cross section of 58 Ni was measured at the neutron time of flight facility n-TOF at CERN, from 27 meV to 400 keV neutron energy. Special care has been taken to identify all the possible sources of background, with the so-called ne... Read More about Experimental neutron capture data of 58Ni from the CERN n_TOF facility.

MESA and NuGrid simulations of classical nova outbursts and nucleosynthesis (2014)
Presentation / Conference Contribution
Pignatari, M., Denisenkov, P. A., Herwig, F., & Truran, J. (2014). MESA and NuGrid simulations of classical nova outbursts and nucleosynthesis. In P. Woudt, & V. Ribeiro (Eds.), Stella Novae: Past and future decades

Classical novae are the results of surface thermonuclear explosions of hydrogen accreted by white dwarfs (WDs) from their low-mass main-sequence or red-giant binary companions. Chemical composition analysis of their ejecta shows that nova outbursts o... Read More about MESA and NuGrid simulations of classical nova outbursts and nucleosynthesis.

Impact of the uncertainty in α-captures on 22Ne on the weak s-process in massive stars (2014)
Presentation / Conference Contribution
Nishimura, N., Hirschi, R., Pignatari, M., Herwig, F., Beard, M., Imbriani, G., …Wiescher, M. (2014). Impact of the uncertainty in α-captures on 22Ne on the weak s-process in massive stars. AIP conference proceedings, 1594(1), 146-151. https://doi.org/10.1063/1.4874059

Massive stars at solar metallicity contribute to the production of heavy elements with atomic masses between A = 60 and A = 90 via the so-called weak s-process (which takes place during core He and shell C burning phases). Furthermore, recent studies... Read More about Impact of the uncertainty in α-captures on 22Ne on the weak s-process in massive stars.

17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process (2012)
Presentation / Conference Contribution
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 i-process and CEMP-r/s stars
Presentation / Conference Contribution
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.