Experimental Neutron Capture Rate Constraint Far from Stability

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

doi:10.1103/physrevlett.116.242502

Cited by 63 publications

(62 citation statements)

References 49 publications

(53 reference statements)

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“…This experiment was the first-ever application of the TAS technique with a fast beam produced via projectile fragmentation. Results from later experiments with roughly the same experimental setup have already been published [20][21][22]. The extracted β-decay feeding intensity distributions for the nuclides in the present work will be presented in forthcoming papers.…”

Section: Methodsmentioning

confidence: 75%

β-decay half-lives of neutron-rich nuclides in theA=100–110mass region

et al. 2019

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β-decay half-lives of neutron-rich nuclides in the A = 100-110 mass region have been measured using an implantation station installed inside of the Summing NaI(Tl) (SuN) detector at the National Superconducting Cyclotron Laboratory. Accurate half-lives for these nuclides are important for nuclear astrophysics, nuclear structure, and nuclear technology. The half-lives from the present work are compared with previous measurements, showing overall good agreement. I.

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Section: Methodsmentioning

confidence: 75%

β-decay half-lives of neutron-rich nuclides in theA=100–110mass region

et al. 2019

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“…Direct measurements are limited to reasonably long-lived targets and hence statistical properties will play an increasingly important role in determining many astrophysically relevant cross sections. Experimental efforts already focus on new techniques, utilizing beta decay [18,19] and surrogate reactions [20], with the goal to obtain (n, γ) cross sections for nuclei far from stability.…”

Section: Introductionmentioning

confidence: 99%

Examination of the low-energy enhancement of theγ-ray strength function ofFe56

Jones¹,

Macchiavelli²,

Wiedeking³

et al. 2018

Phys. Rev. C

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A model-independent technique was used to determine the γ-ray Strength Function (γSF) of 56 Fe down to γ-ray energies less than 1 MeV for the first time with GRETINA using the (p, p ) reaction at 16 MeV. No difference was observed in the energy dependence of the γSF built on 2 + and 4 + final states, supporting the Brink hypothesis. In addition, angular distribution and polarization measurements were performed. The angular distributions are consistent with dipole radiation. The polarization results show a small bias towards magnetic character in the region of the enhancement.

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“…Where there is disagreement between models, there is no experimental data and the majority of nuclei that have substantial impact on the final r-process abundances are in this category, see Refs. [24,25,26] for recent examples. The most important nuclear physics inputs for the r process are masses, β-decays and neutron capture rates near closed neutron shells and in the rare earth region [19].…”

Section: Introductionmentioning

confidence: 99%

Reverse engineering nuclear properties from rare earth abundances in therprocess

Mumpower

McLaughlin

Surman

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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Abstract. The bulk of the rare earth elements are believed to be synthesized in the rapid neutron capture process or r process of nucleosynthesis. The solar r-process residuals show a small peak in the rare earths around A ∼ 160, which is proposed to be formed dynamically during the end phase of the r process by a pileup of material. This abundance feature is of particular importance as it is sensitive to both the nuclear physics inputs and the astrophysical conditions of the main r process. We explore the formation of the rare earth peak from the perspective of an inverse problem, using Monte Carlo studies of nuclear masses to investigate the unknown nuclear properties required to best match rare earth abundance sector of the solar isotopic residuals. When nuclear masses are changed, we recalculate the relevant β-decay properties and neutron capture rates in the rare earth region. The feedback provided by this observational constraint allows for the reverse engineering of nuclear properties far from stability where no experimental information exists. We investigate a range of astrophysical conditions with this method and show how these lead to different predictions in the nuclear properties influential to the formation of the rare earth peak. We conclude that targeted experimental campaigns in this region will help to resolve the type of conditions responsible for the production of the rare earth nuclei, and will provide new insights into the longstanding problem of the astrophysical site(s) of the r process. arXiv:1609.09858v1 [nucl-th] 30 Sep 2016Reverse engineering nuclear properties from rare earth abundances in the r process 2

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Experimental Neutron Capture Rate Constraint Far from Stability

Cited by 63 publications

References 49 publications

β-decay half-lives of neutron-rich nuclides in theA=100–110mass region

β-decay half-lives of neutron-rich nuclides in theA=100–110mass region

Examination of the low-energy enhancement of theγ-ray strength function ofFe56

Reverse engineering nuclear properties from rare earth abundances in therprocess

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