Publisher’s Note: Experimental Neutron Capture Rate Constraint Far from Stability [Phys. Rev. Lett. 
<b>116</b>
, 242502 (2016)]

Liddick, S. N.; Spyrou, A.; Crider, Ben; Naqvi, F.; Larsen, A. C.; Guttormsen, M.; Mumpower, Matthew; Surman, Rebecca; Perdikakis, G.; Bleuel, D. L.; Couture, A.; Dombos, A. C.; Lewis, R.E.; Mosby, S.; Nikas, Stylianos; Prokop, C. J.; Renstrøm, T.; Rubio, B.; Siem, S.; Quinn, Stephen

doi:10.1103/physrevlett.122.129902

Cited by 15 publications

(52 citation statements)

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“…The (n, γ) rates were calculated with the reaction code TALYS [73,74] varying the level density and γ-strength function as listed in Tab. I of Liddick et al [76]. section data exists along the r-process path, and astrophysical calculations have to rely on theoretical predictions.…”

Section: Sensitivity To Nuclear Inputmentioning

confidence: 99%

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Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Larsen

Spyrou

Liddick

et al. 2019

Progress in Particle and Nuclear Physics

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The rapid-neutron capture process (r process) is identified as the producer of about 50% of elements heavier than iron.This process requires an astrophysical environment with an extremely high neutron flux over a short amount of time (∼ seconds), creating very neutron-rich nuclei that are subsequently transformed to stable nuclei via β − decay. In 2017, one site for the r process was confirmed: the advanced LIGO and advanced Virgo detectors observed two neutron stars merging, and immediate follow-up measurements of the electromagnetic transients demonstrated an "afterglow" over a broad range of frequencies fully consistent with the expected signal of an r process taking place. Although neutronstar mergers are now known to be r-process element factories, contributions from other sites are still possible, and a comprehensive understanding and description of the r process is still lacking. One key ingredient to large-scale r-process reaction networks is radiative neutron-capture (n, γ) rates, for which there exist virtually no data for extremely neutronrich nuclei involved in the r process. Due to the current status of nuclear-reaction theory and our poor understanding of basic nuclear properties such as level densities and average γ-decay strengths, theoretically estimated (n, γ) rates may vary by orders of magnitude and represent a major source of uncertainty in any nuclear-reaction network calculation of rprocess abundances. In this review, we discuss new approaches to provide information on neutron-capture cross sections and reaction rates relevant to the r process. In particular, we focus on indirect, experimental techniques to measure radiative neutron-capture rates. While direct measurements are not available at present, but could possibly be realized in the future, the indirect approaches present a first step towards constraining neutron-capture rates of importance to the r process.

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Section: Sensitivity To Nuclear Inputmentioning

confidence: 99%

“…3, taken from Ref. [76]. In this study, neutron-capture reactions were varied by a factor of 100 (light-color band), by a factor of 10 (medium-color band), and by a factor of 2 (dark-color band).…”

Section: Sensitivity To Nuclear Inputmentioning

confidence: 99%

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Larsen

Spyrou

Liddick

et al. 2019

Progress in Particle and Nuclear Physics

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“…The beta-Oslo method is capable of extracting NLDs and γSFs of neutron-rich nuclei, enabling an indirect way to experimentally constrain (n, γ) reaction rates of relevance to the r-process. So far, three reaction rates have been inferred: 75 Ge(n, γ) 76 Ge [8], 69 Ni(n, γ) 70 Ni [9] and 68 Ni(n, γ) 69 Ni [26]. In the future, many more rates will be constrained with this technique, to the benefit of r-process nucleosynthesis calculations and our understanding of NLDs and γSFs.…”

Section: Discussionmentioning

confidence: 99%

“…In this work, a recently developed method to address this issue is presented: The beta-Oslo method [8,9] provides data on the nuclear level density and average γ-decay strength of moderately neutron-rich nuclei. These quantities are crucial input for calculations of neutron-capture rates [5].…”

Section: Introductionmentioning

confidence: 99%

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The Beta-Oslo Method: Experimentally Constrained ( $$n,\gamma $$ ) Reaction Rates Relevant to the r-Process

Larsen

Liddick

Spyrou

et al. 2019

Springer Proceedings in Physics

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Unknown neutron-capture reaction rates remain a significant source of uncertainty in state-of-the-art r-process nucleosynthesis reaction network calculations. As the r-process involves highly neutron-rich nuclei for which direct (n, γ) cross-section measurements are virtually impossible, indirect methods are called for to constrain (n, γ) cross sections used as input for the r-process nuclear network. Here we discuss the newly developed beta-Oslo method, which is capable of provding experimental input for calculating (n, γ) rates of neutron-rich nuclei. The beta-Oslo method represents a first step towards constraining neutroncapture rates of importance to the r-process.

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Nuclear Data and Experiments for Astrophysics

Kankainen

Goriely

2022

The Euroschool on Exotic Beams, Vol. VI

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Nuclear astrophysics aims to understand the origin of elements and the role of nuclear processes in astrophysical events. Nuclear reactions and reaction rates depend strongly on nuclear properties and on the astrophysical environment. Nuclear inputs for stellar reaction rates involve a variety of nuclear properties, theoretical models, and experimental data. Experiments providing data for nuclear astrophysics range from stable ion beam direct measurements to radioactive beam experiments employing inverse kinematics or indirect methods. Many properties relevant for astrophysical calculations, such as nuclear masses and β-decays, have also been intensively studied. This contribution shortly introduces selected astrophysical processes, discusses the related nuclear data needs, and gives examples of recent experimental and theoretical efforts in the field. Origin of Elements and Nucleosynthesis Processes The Composition of the UniverseOur knowledge of the composition of the Universe in general, and of our Solar System in particular, results almost entirely from the analysis of electromagnetic spectra originating from the various observable sources in the Universe, i.e., the

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Publisher’s Note: Experimental Neutron Capture Rate Constraint Far from Stability [Phys. Rev. Lett. 116 , 242502 (2016)]

Cited by 15 publications

References 0 publications

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

The Beta-Oslo Method: Experimentally Constrained ( $$n,\gamma $$ ) Reaction Rates Relevant to the r-Process

Nuclear Data and Experiments for Astrophysics

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