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Dr Marco Pignatari


Evaluation of the $^{13}$N($\alpha$,p)$^{16}$O thermonuclear reaction rate and its impact on the isotopic composition of supernova grains (2020)
Journal Article
M. Laird, A., G. Pellegriti, M., Meyer, A., de Séréville, N., Laird, A., Hammache, F., …Tatischeff, V. (2020). Evaluation of the $^{13}$N($\alpha$,p)$^{16}$O thermonuclear reaction rate and its impact on the isotopic composition of supernova grains. Physical Review C, 102(3), https://doi.org/10.1103/PhysRevC.102.035803

It has been suggested that hydrogen ingestion into the helium shell of massive stars could lead to high $^{13}$C and $^{15}$N excesses when the shock of a core-collapse supernova passes through its helium shell. This prediction questions the origin o... Read More about Evaluation of the $^{13}$N($\alpha$,p)$^{16}$O thermonuclear reaction rate and its impact on the isotopic composition of supernova grains.

Shell-model studies of the astrophysical rp-process reactions S34(p,γ)Cl35 and Cl34g,m(p,γ)Ar35 (2020)
Journal Article
Richter, W. A., Brown, B. A., Longland, R., Wrede, C., Denissenkov, P., Fry, C., …Reifarth, R. (in press). Shell-model studies of the astrophysical rp-process reactions S34(p,γ)Cl35 and Cl34g,m(p,γ)Ar35. Physical Review C, 102(2), https://doi.org/10.1103/physrevc.102.025801

Background: Dust grains condensed in the outflows of presolar classical novae should have been present in the protosolar nebula. Candidates for such presolar nova grains have been found in primitive meteorites and can in principle be identified by th... Read More about Shell-model studies of the astrophysical rp-process reactions S34(p,γ)Cl35 and Cl34g,m(p,γ)Ar35.

Origin of Large Meteoritic SiC Stardust Grains in Metal-rich AGB Stars (2020)
Journal Article
Dell'Agli, F., D'Orazi, V., Schönb chler, M., Lugaro, M., Cseh, B., Világos, B., …Nittler, L. R. (2020). Origin of Large Meteoritic SiC Stardust Grains in Metal-rich AGB Stars. The Astrophysical journal, 898(2), https://doi.org/10.3847/1538-4357/ab9e74

Stardust grains that originated in ancient stars and supernovae are recovered from meteorites and carry the detailed composition of their astronomical sites of origin. We present evidence that the majority of large (μm-sized) meteoritic silicon carbi... Read More about Origin of Large Meteoritic SiC Stardust Grains in Metal-rich AGB Stars.

Chromium Nucleosynthesis and Silicon-Carbon Shell Mergers in Massive Stars (2020)
Journal Article
Côté, B., Jones, S., Herwig, F., & Pignatari, M. (2020). Chromium Nucleosynthesis and Silicon-Carbon Shell Mergers in Massive Stars. The Astrophysical journal, 892(1), https://doi.org/10.3847/1538-4357/ab77ac

We analyze the production of the element Cr in galactic chemical evolution (GCE) models using the NuGrid nucleosynthesis yields set. We show that the unusually large [Cr/Fe] abundance at [Fe/H] ≈ 0 reported by previous studies using those yields and... Read More about Chromium Nucleosynthesis and Silicon-Carbon Shell Mergers in Massive Stars.

The Nucleosynthetic Yields of Core-collapse Supernovae: Prospects for the Next Generation of Gamma-Ray Astronomy (2020)
Journal Article
Andrews, S., Fryer, C., Even, W., Jones, S., & Pignatari, M. (2020). The Nucleosynthetic Yields of Core-collapse Supernovae: Prospects for the Next Generation of Gamma-Ray Astronomy. The Astrophysical journal, 890(1), https://doi.org/10.3847/1538-4357/ab64f8

Though the neutrino-driven convection model for the core-collapse explosion mechanism has received strong support in recent years, there are still many uncertainties in the explosion parameters—such as explosion energy, remnant mass, and end-of-life... Read More about The Nucleosynthetic Yields of Core-collapse Supernovae: Prospects for the Next Generation of Gamma-Ray Astronomy.

Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14N/15N Ratios (2019)
Journal Article
Hoppe, P., Stancliffe, R. J., Pignatari, M., & Amari, S. (2019). Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14N/15N Ratios. The Astrophysical journal, 887(1), 10. https://doi.org/10.3847/1538-4357/ab521c

We report high-resolution C, N, Al, Si, and S isotope data of 38 presolar SiC grains of type AB. Seventeen of these grains are of subtype AB1 (14N/15N < 440 = solar) and 20 of subtype AB2 (14N/15N ≥ 440), previously proposed to be mainly from superno... Read More about Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14N/15N Ratios.

The s process in rotating low-mass AGB stars. Nucleosynthesis calculations in models matching asteroseismic constraints (2019)
Journal Article
den Hartogh, J., Hirschi, R., Lugaro, M., Doherty, C., Battino, U., Herwig, F., …Eggenberger, P. (2019). The s process in rotating low-mass AGB stars. Nucleosynthesis calculations in models matching asteroseismic constraints. Astronomy and Astrophysics, 629, https://doi.org/10.1051/0004-6361/201935476

Aims. We investigate the s-process during the AGB phase of stellar models whose cores are enforced to rotate at rates consistent with asteroseismology observations of their progenitors and successors. Methods. We calculated new 2M⊙, Z=0.01 models, ro... Read More about The s process in rotating low-mass AGB stars. Nucleosynthesis calculations in models matching asteroseismic constraints.

A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production (2019)
Journal Article
Taggart, M. P., Akers, C., Laird, A. M., Hager, U., Ruiz, C., Hutcheon, D. A., …Williams, M. (2019). A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production. Physics letters. B, 798, . https://doi.org/10.1016/j.physletb.2019.134894

© 2019 The Authors During the slow neutron capture process in massive stars, reactions on light elements can both produce and absorb neutrons thereby influencing the final heavy element abundances. At low metallicities, the high neutron capture rate... Read More about A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production.

Presolar SiC Grains of Type AB with Isotopically Light Nitrogen: Contributions from Supernovae? (2019)
Journal Article
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)
Journal Article
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.

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