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We study the gravitational collapse of prestellar sources and the associated evolution of their chemical composition. We use the University of Grenoble Alpes Astrochemical Network (UGAN), which includes reactions involving the different…

Astrophysics of Galaxies · Physics 2018-04-25 P. Hily-Blant , A. Faure , C. Rist , G. Pineau des Foreêts , D. R. Flower

By means of HARM\_COOL\_EOS, which is our code for conservative relativistic magnetohydrodynamics, we developed a new scheme for the simulation of a system formed after compact binary merger. Our code works with a tabulated equation of…

High Energy Astrophysical Phenomena · Physics 2024-01-18 Agnieszka Janiuk , Gerardo Urrutia

In this paper we present a large-scale sensitivity study of reaction rates in the main component of the $s$ process. The aim of this study is to identify all rates, which have a global effect on the $s$ process abundance distribution and…

Solar and Stellar Astrophysics · Physics 2016-02-16 A. Koloczek , B. Thomas , J. Glorius , R. Plag , M. Pignatari , R. Reifarth , C. Ritter , S. Schmidt , K. Sonnabend

Results from observations report a growing number of metal-poor stars showing an abundance pattern midway between the s- and r-processes. These so-called r/s-stars raise the need for an intermediate neutron capture process (i-process),…

Solar and Stellar Astrophysics · Physics 2022-06-29 A. Choplin , L. Siess , S. Goriely

The recent parameterisation by the GSP-spec module of Gaia/RVS spectra has produced an homogeneous catalogue of about 174,000 AGB stars. Among the 13 chemical elements presented in this catalogue, the abundance of 2 of them (Ce and Nd) have…

Solar and Stellar Astrophysics · Physics 2024-01-02 G. Contursi , P. de Laverny , A. Recio-Blanco , P. A. Palicio , C. Abia

The $s$-process nucleosynthesis in Asymptotic Giant Branch (AGB) stars depends on the modeling of convective boundaries. We present models and s-process simulations that adopt a treatment of convective boundaries based on the results of…

Solar and Stellar Astrophysics · Physics 2016-10-05 U. Battino , M. Pignatari , C. Ritter , F. Herwig , P. Denisenkov , J. W. Den Hartogh , R. Trappitsch , R. Hirschi , B. Freytag , F. Thielemann , B. Paxton

We propose the use of a decoupling renormalization scheme in the calculation of NLO corrections to SM-like Higgs boson decays in the beyond the Standard Model models. The advantage of this particular scheme is its decoupling property in the…

High Energy Physics - Phenomenology · Physics 2025-07-31 Jonas Lang , Wojciech Kotlarski

Roughly half of the heavy elements (atomic mass greater than that of iron) are believed to be synthesized in the late evolutionary stages of stars with masses between 0.8 and 8 solar masses. Deep inside the star, nuclei (mainly iron)…

Solar and Stellar Astrophysics · Physics 2016-01-22 Pieter Neyskens , Sophie Van Eck , Alain Jorissen , Stephane Goriely , Lionel Siess , Bertrand Plez

The s-enhanced and very metal-poor star CS 30322-023 shows a puzzling abundance pattern of the neutron-capture elements, i.e. several neutron-capture elements such as Ba, Pb etc. show enhancement, but other neutron-capture elements such as…

Astrophysics · Physics 2010-11-05 W. Y. Cui , B. Zhang , K. Ma , L. Zhang

In this paper, we propose an easily trained yet powerful representation learning approach with performance highly competitive to deep neural networks in a digital pathology image segmentation task. The method, called sparse coding driven…

Computer Vision and Pattern Recognition · Computer Science 2020-08-14 Jie Song , Liang Xiao , Mohsen Molaei , Zhichao Lian

Barium stars show enhanced abundances of the slow neutron capture (s-process) heavy elements, and for this reason they are suitable objects for the study of s-process elements. The aim of this work is to quantify the contributions of the…

Astrophysics · Physics 2009-11-11 Dinah M. Allen , Beatriz Barbuy

The MINCE (Measuring at Intermediate metallicity Neutron-Capture Elements) project aims to gather the abundances of neutron-capture elements but also of light elements and iron peak elements in a large sample of giant stars in this…

We present the results of fully dynamical r-process network calculations for the ejecta of neutron star mergers (NSMs). The late stages of the inspiral and the final violent coalescence of a neutron star binary have been calculated in…

Astrophysics · Physics 2009-10-31 S. Rosswog , C. Freiburghaus , F. -K. Thielemann

A novel machine learning approach is used to provide further insight into atomic nuclei and to detect orderly patterns amidst a vast data of large-scale calculations. The method utilizes a neural network that is trained on ab initio results…

Nuclear Theory · Physics 2022-03-14 O. M. Molchanov , K. D. Launey , A. Mercenne , G. H. Sargsyan , T. Dytrych , J. P. Draayer

$\underline{\textbf{MO}}$nte-carlo $\underline{\textbf{N}}$ucleon transport $\underline{\textbf{C}}$ode (MONC) for nucleon transport is being developed for several years. Constructive Solid Geometry concept is applied with the help of solid…

Nuclear Theory · Physics 2020-08-27 H. Kumawat , P. P. K. Venkata

Coarse-graining (CG) of molecular simulations simplifies the particle representation by grouping selected atoms into pseudo-beads and drastically accelerates simulation. However, such CG procedure induces information losses, which makes…

Machine Learning · Computer Science 2022-06-20 Wujie Wang , Minkai Xu , Chen Cai , Benjamin Kurt Miller , Tess Smidt , Yusu Wang , Jian Tang , Rafael Gómez-Bombarelli

We focus on the sodium destruction in models reaching the high hot bottom burning temperatures needed to efficiently cycle oxygen to nitrogen in AGB models at the nominal [Fe/H] of the cluster NGC 2808. We increase the initial neon…

Solar and Stellar Astrophysics · Physics 2026-02-03 P. Ventura , F. D'Antona , M. Tailo , A. P. Milone , F. Dell'Agli , A. F. Marino

We present COMPASS, a novel simulation-based inference framework that combines score-based diffusion models with transformer architectures to jointly perform parameter estimation and Bayesian model comparison across competing Galactic…

Astrophysics of Galaxies · Physics 2025-07-09 Berkay Gunes , Sven Buder , Tobias Buck

A possible mechanism for the formation of heavy-mass elements in supernovae is the rapid neutron-capture-mechanism (r-process). It depends upon the electron-fraction $Y_e$, a quantity which is determined by beta-decay-rates. In this paper,…

Nuclear Theory · Physics 2020-07-07 M. M. Saez , O. Civitarese , M. E. Mosquera

Module for ab initio structure evolution (MAISE) is an open-source package for materials modeling and prediction. The code's main feature is an automated generation of neural network (NN) interatomic potentials for use in global structure…

Computational Physics · Physics 2020-10-26 Samad Hajinazar , Aidan Thorn , Ernesto D. Sandoval , Saba Kharabadze , Aleksey N. Kolmogorov