The 39K(3He, 3He)39K and 39K(3He, d)40Ca reactions at 29.3 MeV

Cage, Marvin E.; Johnson, Richard R.; Kunz, P.D.; Lind, David A.

doi:10.1016/0375-9474(71)90263-6

Cited by 22 publications

(6 citation statements)

References 38 publications

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“…Information on the compound levels between 100 and 500 keV is therefore limited to indirect measurements. Of the 15 resonances observed in this range, the proton partial width, Γ p , has been estimated only for the E cm R = 97, 223, and 337 keV resonances (Seth et al 1967;Cage et al 1971;Fuchs et al 1969). Their estimated relative contributions to the reaction rate are illustrated in the middle panel of Figure 5 alongside other important resonances.…”

Section: 1mentioning

confidence: 99%

Sensitivity to Thermonuclear Reaction Rates in Modeling the Abundance Anomalies of NGC 2419

Dermigny

Iliadis

2017

ApJ

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Abundance anomalies in globular clusters provide strong evidence for multiple stellar populations within each cluster. These populations are usually interpreted as distinct generations, with the currently observed second-generation stars having formed in part from the ejecta of massive, firstgeneration "polluter" stars, giving rise to the anomalous abundance patterns. The precise nature of the polluters and their enrichment mechanism are still unclear. Even so, the chemical abundances measured in second-generation stars within the globular cluster NGC 2419 provide insight into this puzzling process. Previous work used Monte Carlo nuclear reaction network calculations to constrain the temperature-density conditions that could reproduce the observed abundances, thereby placing robust limits on the origins of the polluter material. The effect of individual reaction rates on these conditions has not been studied, however. Thus, we perform an exhaustive sensitivity study on the nuclear physics input to determine which reactions have the greatest impact on these predictions. We find that the 30 Si(p,γ) 31 P, 37 Ar(p,γ) 38 K, 38 Ar(p,γ) 39 K, and 39 K(p,γ) 40 Ca reactions are all critical in determining the temperature-density conditions, and ultimately, the origin of the polluter material. We conclude with recommendations for future experiments.

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Section: 1mentioning

confidence: 99%

Sensitivity to Thermonuclear Reaction Rates in Modeling the Abundance Anomalies of NGC 2419

Dermigny

Iliadis

2017

ApJ

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“…Indirect measurements have also been performed, which provide useful supplementary information. Proton widths in the excitation energy region of interest have been inferred by proton transfer reactions: through ( 3 He,d) [26][27][28][29] and (d,n) [30]. Additionally, α-particle widths in this excitation energy range have been inferred through the 36 Ar( 6 Li,d) 40 Ca reaction [31].…”

Section: The 39 K+p Reactionsmentioning

confidence: 99%

“…and spin-parity assignments from other, indirect, measurements can be used. Proton widths in the astrophysically important range have been determined though the (d,n) reaction by Fuchs et al [30], and the ( 3 He,d) reaction by Erskine et al [26], Seth et al [27], and Cage et al [29]. Of these, Ref.…”

Section: B Resonance Strengthsmentioning

confidence: 99%

“…Of these, Ref. [29] employed a more advanced finite range modified Distorted Wave Born Approximation, so we consider it to supersede the other studies here. However, it should be noted that their results are in good agreement with the (d,n) measurement of Ref.…”

Section: B Resonance Strengthsmentioning

confidence: 99%

“…Its spin-parity comes from 41 Ca( 3 He,α) 40 Ca, inelastic proton scattering, 39 K(d,n) 40 Ca, and 39 K( 3 He,d) 40 Ca. A proton spectroscopic factor of S p = 0.56 has been determined [29].…”

Section: Information On Specific 40 Ca Levelsmentioning

confidence: 99%

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Reaction rates for the K39(p,γ)Ca40 reaction

2018

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The magnesium-potassium anti-correlation observed in globular cluster NGC2419 can be explained by nuclear burning of hydrogen in hot environments. The exact site of this nuclear burning is, as yet, unknown. In order to constrain the sites responsible for this anti-correlation, the nuclear reactions involved must be well understood. The 39 K+p reactions are one such pair of reactions. Here, we report a new evaluation of the 39 K(p,γ) 40 Ca reaction rate by taking into account ambiguities and measurement uncertainties in the nuclear data. The uncertainty in the 39 K(p,γ) 40 Ca reaction rate is larger than previously assumed, and its influence on nucleosynthesis models is demonstrated. We find the 39 K(p,γ) 40 Ca reaction cross section should be the focus of future experimental study to help constrain models aimed at explaining the magnesium-potassium anti-correlation in globular clusters.

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The residual interaction of bound nucleons-two-nucleon matrix elements deduced from transfer experiments

Daehnick¹

1983

Physics Reports

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The 39K(3He, 3He)39K and 39K(3He, d)40Ca reactions at 29.3 MeV

Cited by 22 publications

References 38 publications

Sensitivity to Thermonuclear Reaction Rates in Modeling the Abundance Anomalies of NGC 2419

Sensitivity to Thermonuclear Reaction Rates in Modeling the Abundance Anomalies of NGC 2419

Reaction rates for the K39(p,γ)Ca40 reaction

The residual interaction of bound nucleons-two-nucleon matrix elements deduced from transfer experiments

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