☆ 4.6 Article

FORMALISM FOR INCLUSION OF MEASURED REACTION CROSS SECTIONS IN STELLAR RATES INCLUDING UNCERTAINTIES AND ITS APPLICATION TO NEUTRON CAPTURE IN THE s-PROCESS

ASTROPHYSICAL JOURNAL LETTERS (2012)

期刊

ASTROPHYSICAL JOURNAL LETTERS

卷 755, 期 1, 页码 -

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IOP PUBLISHING LTD

DOI: 10.1088/2041-8205/755/1/L10

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nuclear reactions; nucleosynthesis; abundances

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Astronomy & Astrophysics

资金

European Commission
EuroGENESIS Collaborative Research Programme

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摘要

A general formalism to include experimental reaction cross sections into calculations of stellar rates is presented. It also allows us to assess the maximally possible reduction of uncertainties in the stellar rates by experiments. As an example for the application of the procedure, stellar neutron capture reactivities from KADoNiS v0.3 are revised and the remaining uncertainties shown. Many of the uncertainties in the stellar rates are larger than those obtained experimentally. This has important consequences for s-process models and the interpretation of meteoritic data because it allows the rates of some reactions to vary within a larger range than previously assumed.

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Article Astronomy & Astrophysics

First Results of the 140Ce(n,γ)141Ce Cross-Section Measurement at n_TOF

Simone Amaducci, Nicola Colonna, Luigi Cosentino, Sergio Cristallo, Paolo Finocchiaro, Cristian Massimi, Mario Mastromarco, Annamaria Mazzone, Alberto Mengoni, Stanislav Valenta, Oliver Aberle, Victor Alcayne, Jozef Andrzejewski, Laurent Audouin, Victor Babiano-Suarez, Michael Bacak, Massimo Barbagallo, Samuel Bennett, Eric Berthoumieux, Jon Billowes, Damir Bosnar, Adam Brown, Maurizio Busso, Manuel Caamano, Luis Caballero-Ontanaya, Francisco Calvino, Marco Calviani, Daniel Cano-Ott, Adria Casanovas, Francesco Cerutti, Enrico Chiaveri, Guillem Cortes, Miguel Cortes-Giraldo, Lucia-Anna Damone, Paul-John Davies, Maria Diakaki, Mirco Dietz, Cesar Domingo-Pardo, Rugard Dressler, Quentin Ducasse, Emmeric Dupont, Ignacio Duran, Zinovia Eleme, Beatriz Fernandez-Dominguez, Alfredo Ferrari, Valter Furman, Kathrin Goebel, Ruchi Garg, Aleksandra Gawlik, Simone Gilardoni, Isabel Goncalves, Enrique Gonzalez-Romero, Carlos Guerrero, Frank Gunsing, Hideo Harada, Stephan Heinitz, Jan Heyse, David Jenkins, Arnd Junghans, Franz Kaeppeler, Yacine Kadi, Atsushi Kimura, Ingrid Knapova, Michael Kokkoris, Yuri Kopatch, Deniz Kurtulgil, Ion Ladarescu, Claudia Lederer-Woods, Helmut Leeb, Jorge Lerendegui-Marco, Sarah-Jane Lonsdale, Daniela Macina, Alice Manna, Trinitario Martinez, Alessandro Masi, Pierfrancesco Mastinu, Emilio-Andrea Maugeri, Emilio Mendoza, Veatriki Michalopoulou, Paolo Milazzo, Federica Mingrone, Javier Moreno-Soto, Agatino Musumarra, Alexandru Negret, Francisco Ogallar, Andreea Oprea, Nikolas Patronis, Andreas Pavlik, Luciano Piersanti, Cristina Petrone, Elisa Pirovano, Ignacio Porras, Javier Praena, Jose-Manuel Quesada, Diego Ramos-Doval, Thomas Rauscher, Rene Reifarth, Dimitri Rochman, Carlo Rubbia, Marta Sabate-Gilarte, Alok Saxena, Peter Schillebeeckx, Dorothea Schumann, Adhitya Sekhar, Gavin Smith, Nikolay Sosnin, Peter Sprung, Athanasios Stamatopoulos, Giuseppe Tagliente, Jose Tain, Ariel Tarifeno-Saldivia, Laurent Tassan-Got, Benedikt Thomas, Pablo Torres-Sanchez, Andrea Tsinganis, Jiri Ulrich, Sebastian Urlass, Gianni Vannini, Vincenzo Variale, Pedro Vaz, Alberto Ventura, Diego Vescovi, Vasilis Vlachoudis, Rosa Vlastou, Anton Wallner, PhilipJohn Woods, Tobias Wright, Petar Zugec

Summary: The accurate measurement of the Ce-140(n,gamma) energy-dependent cross-section provides crucial insights into the cerium abundance in stars. By using a sample enriched in Ce-140 to 99.4%, the study aimed to address the discrepancy between measured cerium abundance in globular clusters and the predictions from theoretical models. The analysis of p-wave resonances and calculation of their parameters are essential in improving the evaluation of the Ce-140 Maxwellian-averaged cross-section.

UNIVERSE (2021)

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Article Astronomy & Astrophysics

3D stellar evolution: hydrodynamic simulations of a complete burning phase in a massive star

F. Rizzuti, R. Hirschi, W. D. Arnett, C. Georgy, C. Meakin, A. StJ Murphy, T. Rauscher, V. Varma

Summary: In this study, 3D simulations of a convective neon-burning shell in a 20 M-circle dot star were performed, revealing the importance of convective zones in stellar structure and evolution. By revising the modeling of convective boundary mixing in 1D models, consistent results were obtained with multi-D simulations. This has significant implications for theoretical predictions related to stellar evolution, nucleosynthesis, supernova explosions, and compact remnants.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

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Article Physics, Nuclear

Stellar neutron capture reactions at low and high temperature

Thomas Rauscher

Summary: This article discusses the methods for determining astrophysical reaction rates under different conditions, with a focus on the rates of radiative neutron capture reactions. The article also explains the differences between various nucleosynthesis processes, including the s-process, i-process, r-process, and gamma-process, emphasizing the variations in interaction energies and nuclear level densities at low and high temperatures.

EUROPEAN PHYSICAL JOURNAL A (2022)

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Article Physics, Nuclear

Constraints on the dipole photon strength for the odd uranium isotopes

J. Moreno-Soto, S. Valenta, E. Berthoumieux, A. Chebboubi, M. Diakaki, W. Dridi, E. Dupont, F. Gunsing, O. Litaize, O. Serot, O. Aberle, V Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V Becares, V Babiano-Suarez, M. Bacak, M. Barbagallo, Th Benedikt, S. Bennett, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamano, L. Caballero-Ontanaya, F. Calvino, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, E. Chiaveri, N. Colonna, G. Cortes, M. A. Cortes-Giraldo, L. Cosentino, S. Cristallo, L. A. Damone, P. J. Davies, M. Dietz, C. Domingo-Pardo, R. Dressler, Q. Ducasse, I Duran, Z. Eleme, B. Fernandez-Dominguez, A. Ferrari, P. Finocchiaro, V Furman, K. Gobel, S. Gilardoni, I. F. Goncalves, E. Gonzalez-Romero, C. Guerrero, S. Heinitz, J. Heyse, D. G. Jenkins, A. Junghans, F. Kappeler, Y. Kadi, A. Kimura, I Knapova, M. Kokkoris, Y. Kopatch, D. Kurtulgil, I Ladarescu, C. Lampoudis, C. Lederer-Woods, S. J. Lonsdale, D. Macina, A. Manna, T. Martinez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, V Michalopoulou, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, F. Ogallar, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, L. Piersanti, C. Petrone, E. Pirovano, I Porras, J. Praena, J. M. Quesada, D. Ramos-Doval, T. Rauscher, R. Reifarth, D. Rochman, M. Sabate-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. Sekhar, A. G. Smith, N. Sosnin, P. Sprung, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeno-Saldivia, L. Tassan-Got, P. Torres-Sanchez, A. Tsinganis, J. Ulrich, S. Urlass, G. Vannini, V. Variale, P. Vaz, A. Ventura, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, P. Zugec

Summary: This study investigates the role of the scissors mode in the M1 PSF of actinides using experimental techniques. The analyses of different experiments reveal significant differences, and the shape of the low-energy tail of the giant electric dipole resonance is uncertain. The results provide important additional information on PSFs in this region.

PHYSICAL REVIEW C (2022)

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Article Physics, Nuclear

Feasibility of studying astrophysically important charged-particle emission with the variable energy γ-ray system at the Extreme Light Infrastructure-Nuclear Physics facility

H. Y. Lan, W. Luo, Y. Xu, D. L. Balabanski, G. L. Guardo, M. La Cognata, D. Lattuada, C. Matei, R. G. Pizzone, T. Rauscher, J. L. Zhou

Summary: This study investigates the contribution of capture and photodisintegration reactions on excited states in the nucleus to the astrophysical reaction rate in hot plasma environments like stellar explosions. Experimental measurements are proposed to improve the predictive power of theoretical reaction rates and constrain reaction models. The feasibility of measuring (gamma, p) and (gamma, alpha) reactions using the ELISSA detector system at the VEGA facility is investigated. The results show that these measurements are feasible and provide valuable knowledge for nuclear astrophysics.

PHYSICAL REVIEW C (2022)

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Proceedings Paper Astronomy & Astrophysics

Monte Carlo variations as a tool to assess nuclear physics uncertainties in nucleosynthesis studies

Thomas Rauscher

27TH INTERNATIONAL NUCLEAR PHYSICS CONFERENCE (INPC2019) (2020)

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Proceedings Paper Nuclear Science & Technology

Measurement of the 235 U(n,f) cross section at n_TOF from thermal to 170 keV

S. Amaducci, O. Aberle, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, M. Barbagallo, F. Becvar, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamano, F. Calvino, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortes, M. A. Cortes-Giraldo, L. Cosentino, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I Duran, B. Fernandez-Dominguez, A. Ferrari, P. Ferreira, P. Finocchiaro, V Furman, K. Gobel, A. R. Garcia, A. Gawlik, S. Gilardoni, T. Glodariu, I. F. Goncalves, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, E. Jericha, F. Kappeler, Y. Kadi, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, I Knapova, M. Kokkoris, M. Krticka, D. Kurtulgil, S. Lo Meo, E. Leal-Cidoncha, C. Lederer, H. Leeb, J. Lerendegui-Marco, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martinez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, I Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, R. Reifarth, C. Rubbia, J. A. Ryan, M. Sabate-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, P. Sedyshev, A. G. Smith, N. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeno-Saldivia, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, P. Zugec

PROCEEDINGS OF THE 2019 INTERNATIONAL CONFERENCE ON APPLICATIONS OF NUCLEAR TECHNIQUES (CRETE19) (2020)

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