The role of fission on neutron star mergers and its impact on the r-process peaks

M. Eichler; A. Arcones; A. Kelic; O. Korobkin; K. Langanke; T. Marketin; G. Martinez-Pinedo; I. Panov; T. Rauscher; S. Rosswog; C. Winteler; N. T. Zinner; F. K. Thielemann

doi:10.1063/1.4953296

The role of fission on neutron star mergers and its impact on the r-process peaks

M. Eichler, A. Arcones, A. Kelic, O. Korobkin, K. Langanke, T. Marketin, G. Martinez-Pinedo, I. Panov, T. Rauscher, S. Rosswog, C. Winteler, N. T. Zinner, F. K. Thielemann

Centre for Astrophysics Research (CAR)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the quality of the nuclear physics input utilized. Here we test the abundance features of r-process nucleosynthesis calculations using four different fission fragment distribution models. Furthermore, we explore the origin of a shift in the third r-process peak position in comparison with the solar r-process abundances which has been noticed in a number of merger nucleosynthesis predictions. We show that this shift occurs during the r-process freeze-out when neutron captures and β-decays compete and an (n,γ)-(γ,n) equilibrium is not maintained anymore. During this phase neutrons originate mainly from fission of material above A = 240. We also investigate the role of β-decay half-lives from recent theoretical advances, which lead either to a smaller amount of fissioning nuclei during freeze-out or a faster (and thus earlier) release of fission neutrons, which can (partially) prevent this shift and has an impact on the second and rare-earth peak as well.

Original language	English
Title of host publication	CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology
Editors	Barbara Szczerbinska, Rouzbeh Allahverdi, Kaladi Babu, Baha Balantekin, Bhaskar Dutta, Teruki Kamon, Jason Kumar, Farinaldo Queiroz, Louis Strigari, Rebecca Surman
Place of Publication	South Dakota, USA
Publisher	American Institute of Physics (AIP)
Volume	1743
ISBN (Print)	9780735414006
DOIs	https://doi.org/10.1063/1.4953296
Publication status	Published - 21 Jun 2016
Event	5th Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2015 and 9th International Conference on Interconnections between Particle Physics and Cosmology, PPC 2015 - Lead/Deadwood, United States Duration: 15 Jun 2015 → 17 Jul 2015

Conference

Conference	5th Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2015 and 9th International Conference on Interconnections between Particle Physics and Cosmology, PPC 2015
Country/Territory	United States
City	Lead/Deadwood
Period	15/06/15 → 17/07/15

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10.1063/1.4953296

Cite this

Eichler, M., Arcones, A., Kelic, A., Korobkin, O., Langanke, K., Marketin, T., Martinez-Pinedo, G., Panov, I., Rauscher, T., Rosswog, S., Winteler, C., Zinner, N. T., & Thielemann, F. K. (2016). The role of fission on neutron star mergers and its impact on the r-process peaks. In B. Szczerbinska, R. Allahverdi, K. Babu, B. Balantekin, B. Dutta, T. Kamon, J. Kumar, F. Queiroz, L. Strigari, & R. Surman (Eds.), CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology (Vol. 1743). Article 040004 American Institute of Physics (AIP). https://doi.org/10.1063/1.4953296

Eichler, M. ; Arcones, A. ; Kelic, A. et al. / The role of fission on neutron star mergers and its impact on the r-process peaks. CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology. editor / Barbara Szczerbinska ; Rouzbeh Allahverdi ; Kaladi Babu ; Baha Balantekin ; Bhaskar Dutta ; Teruki Kamon ; Jason Kumar ; Farinaldo Queiroz ; Louis Strigari ; Rebecca Surman. Vol. 1743 South Dakota, USA : American Institute of Physics (AIP), 2016.

@inproceedings{db3014a136c84de09801996a5e5d5e0a,

title = "The role of fission on neutron star mergers and its impact on the r-process peaks",

abstract = "The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the quality of the nuclear physics input utilized. Here we test the abundance features of r-process nucleosynthesis calculations using four different fission fragment distribution models. Furthermore, we explore the origin of a shift in the third r-process peak position in comparison with the solar r-process abundances which has been noticed in a number of merger nucleosynthesis predictions. We show that this shift occurs during the r-process freeze-out when neutron captures and β-decays compete and an (n,γ)-(γ,n) equilibrium is not maintained anymore. During this phase neutrons originate mainly from fission of material above A = 240. We also investigate the role of β-decay half-lives from recent theoretical advances, which lead either to a smaller amount of fissioning nuclei during freeze-out or a faster (and thus earlier) release of fission neutrons, which can (partially) prevent this shift and has an impact on the second and rare-earth peak as well.",

author = "M. Eichler and A. Arcones and A. Kelic and O. Korobkin and K. Langanke and T. Marketin and G. Martinez-Pinedo and I. Panov and T. Rauscher and S. Rosswog and C. Winteler and Zinner, {N. T.} and Thielemann, {F. K.}",

note = "M. Eichler, A. Arcones, A. Kelic, O. Korobkin, K. Langanke, T. Marketin, G. Martinez-Pinedo, I. Panov, T. Rauscher, S. Rosswog, C. Winteler, N. T. Zinner, and F. K. Thielemann, {\textquoteleft}The role of fission on neutron star mergers and its impact on the r-process peaks{\textquoteright}, in proceedings CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology. Deadwood, South Dakota, USA. 15-17 July 2015. Barbara Szczerbinska, Rouzbeh Allahverdi, Kaladi Babu, Baha Balantekin, Bhaskar Dutta, Teruki Kamon, Jason Kumar, Farinaldo Queiroz, Louis Strigari, and Rebecca Surman eds., ISBN 9780735414006. Available online at doi: http://dx.doi.org/10.1063/1.4953296. Published by AIP Publishing.; 5th Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2015 and 9th International Conference on Interconnections between Particle Physics and Cosmology, PPC 2015 ; Conference date: 15-06-2015 Through 17-07-2015",

year = "2016",

month = jun,

day = "21",

doi = "10.1063/1.4953296",

language = "English",

isbn = "9780735414006",

volume = "1743",

editor = "Szczerbinska, {Barbara } and Allahverdi, {Rouzbeh } and Babu, {Kaladi } and Balantekin, {Baha } and Dutta, {Bhaskar } and Kamon, {Teruki } and Kumar, {Jason } and Queiroz, {Farinaldo } and Strigari, {Louis } and Surman, {Rebecca }",

booktitle = "CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology",

publisher = "American Institute of Physics (AIP)",

address = "United States",

}

Eichler, M, Arcones, A, Kelic, A, Korobkin, O, Langanke, K, Marketin, T, Martinez-Pinedo, G, Panov, I, Rauscher, T, Rosswog, S, Winteler, C, Zinner, NT & Thielemann, FK 2016, The role of fission on neutron star mergers and its impact on the r-process peaks. in B Szczerbinska, R Allahverdi, K Babu, B Balantekin, B Dutta, T Kamon, J Kumar, F Queiroz, L Strigari & R Surman (eds), CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology. vol. 1743, 040004, American Institute of Physics (AIP), South Dakota, USA, 5th Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2015 and 9th International Conference on Interconnections between Particle Physics and Cosmology, PPC 2015, Lead/Deadwood, United States, 15/06/15. https://doi.org/10.1063/1.4953296

The role of fission on neutron star mergers and its impact on the r-process peaks. / Eichler, M.; Arcones, A.; Kelic, A. et al.
CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology. ed. / Barbara Szczerbinska; Rouzbeh Allahverdi; Kaladi Babu; Baha Balantekin; Bhaskar Dutta; Teruki Kamon; Jason Kumar; Farinaldo Queiroz; Louis Strigari; Rebecca Surman. Vol. 1743 South Dakota, USA: American Institute of Physics (AIP), 2016. 040004.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - The role of fission on neutron star mergers and its impact on the r-process peaks

AU - Eichler, M.

AU - Arcones, A.

AU - Kelic, A.

AU - Korobkin, O.

AU - Langanke, K.

AU - Marketin, T.

AU - Martinez-Pinedo, G.

AU - Panov, I.

AU - Rauscher, T.

AU - Rosswog, S.

AU - Winteler, C.

AU - Zinner, N. T.

AU - Thielemann, F. K.

N1 - M. Eichler, A. Arcones, A. Kelic, O. Korobkin, K. Langanke, T. Marketin, G. Martinez-Pinedo, I. Panov, T. Rauscher, S. Rosswog, C. Winteler, N. T. Zinner, and F. K. Thielemann, ‘The role of fission on neutron star mergers and its impact on the r-process peaks’, in proceedings CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology. Deadwood, South Dakota, USA. 15-17 July 2015. Barbara Szczerbinska, Rouzbeh Allahverdi, Kaladi Babu, Baha Balantekin, Bhaskar Dutta, Teruki Kamon, Jason Kumar, Farinaldo Queiroz, Louis Strigari, and Rebecca Surman eds., ISBN 9780735414006. Available online at doi: http://dx.doi.org/10.1063/1.4953296. Published by AIP Publishing.

PY - 2016/6/21

Y1 - 2016/6/21

N2 - The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the quality of the nuclear physics input utilized. Here we test the abundance features of r-process nucleosynthesis calculations using four different fission fragment distribution models. Furthermore, we explore the origin of a shift in the third r-process peak position in comparison with the solar r-process abundances which has been noticed in a number of merger nucleosynthesis predictions. We show that this shift occurs during the r-process freeze-out when neutron captures and β-decays compete and an (n,γ)-(γ,n) equilibrium is not maintained anymore. During this phase neutrons originate mainly from fission of material above A = 240. We also investigate the role of β-decay half-lives from recent theoretical advances, which lead either to a smaller amount of fissioning nuclei during freeze-out or a faster (and thus earlier) release of fission neutrons, which can (partially) prevent this shift and has an impact on the second and rare-earth peak as well.

AB - The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the quality of the nuclear physics input utilized. Here we test the abundance features of r-process nucleosynthesis calculations using four different fission fragment distribution models. Furthermore, we explore the origin of a shift in the third r-process peak position in comparison with the solar r-process abundances which has been noticed in a number of merger nucleosynthesis predictions. We show that this shift occurs during the r-process freeze-out when neutron captures and β-decays compete and an (n,γ)-(γ,n) equilibrium is not maintained anymore. During this phase neutrons originate mainly from fission of material above A = 240. We also investigate the role of β-decay half-lives from recent theoretical advances, which lead either to a smaller amount of fissioning nuclei during freeze-out or a faster (and thus earlier) release of fission neutrons, which can (partially) prevent this shift and has an impact on the second and rare-earth peak as well.

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UR - http://printorders.aip.org/proceedings/1743

UR - http://aip.scitation.org/doi/abs/10.1063/1.4953296

U2 - 10.1063/1.4953296

DO - 10.1063/1.4953296

M3 - Conference contribution

AN - SCOPUS:84992389424

SN - 9780735414006

VL - 1743

BT - CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology

A2 - Szczerbinska, Barbara

A2 - Allahverdi, Rouzbeh

A2 - Babu, Kaladi

A2 - Balantekin, Baha

A2 - Dutta, Bhaskar

A2 - Kamon, Teruki

A2 - Kumar, Jason

A2 - Queiroz, Farinaldo

A2 - Strigari, Louis

A2 - Surman, Rebecca

PB - American Institute of Physics (AIP)

CY - South Dakota, USA

T2 - 5th Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2015 and 9th International Conference on Interconnections between Particle Physics and Cosmology, PPC 2015

Y2 - 15 June 2015 through 17 July 2015

ER -

Eichler M, Arcones A, Kelic A, Korobkin O, Langanke K, Marketin T et al. The role of fission on neutron star mergers and its impact on the r-process peaks. In Szczerbinska B, Allahverdi R, Babu K, Balantekin B, Dutta B, Kamon T, Kumar J, Queiroz F, Strigari L, Surman R, editors, CETUP* 2015 – Workshop on Dark Matter, Neutrino Physics and Astrophysics PPC 2015 – IXth International Conference on Interconnections between Particle Physics and Cosmology. Vol. 1743. South Dakota, USA: American Institute of Physics (AIP). 2016. 040004 doi: 10.1063/1.4953296

The role of fission on neutron star mergers and its impact on the r-process peaks

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