2006
DOI: 10.1103/physrevlett.97.122502
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Activation Measurement of theHe3(α,γ)Be7Cross Section at Low Energy

Abstract: The nuclear physics input from the 3 He(α, γ) 7 Be cross section is a major uncertainty in the fluxes of 7 Be and 8 B neutrinos from the Sun predicted by solar models and in the 7 Li abundance obtained in big-bang nucleosynthesis calculations. The present work reports on a new precision experiment using the activation technique at energies directly relevant to big-bang nucleosynthesis. Previously such low energies had been reached experimentally only by the prompt-γ technique and with inferior precision. Using… Show more

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Cited by 146 publications
(216 citation statements)
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“…For this purpose, 3 He( α, γ ) 7 Be reaction rate evaluated by Kontos et al [32] is used, which is within 1.5% of the slightly updated de Boer et al [33] and Takács et al [34] rates. The excitation function adopted in that work closely tracks the LUNA data on 3 He( α, γ ) 7 Be [35,36] , which are the only recent experimental data on this reaction at energies below 300 keV, most relevant for BBN. 6 Li reaction from the present work.…”
Section: Thermonuclear Reaction Rate and Astrophysical Implicationsmentioning
confidence: 99%
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“…For this purpose, 3 He( α, γ ) 7 Be reaction rate evaluated by Kontos et al [32] is used, which is within 1.5% of the slightly updated de Boer et al [33] and Takács et al [34] rates. The excitation function adopted in that work closely tracks the LUNA data on 3 He( α, γ ) 7 Be [35,36] , which are the only recent experimental data on this reaction at energies below 300 keV, most relevant for BBN. 6 Li reaction from the present work.…”
Section: Thermonuclear Reaction Rate and Astrophysical Implicationsmentioning
confidence: 99%
“…[ cm 3 Therefore, by using the Kontos et al rate in essence the 6 Li/ 7 Li isotopic ratio is determined by the ratio of two LUNA experimental S-factors in similar setups: The present 2 H( α, γ ) 6 Li data on 6 Li production, and the previous 3 He( α, γ ) 7 Be data [35,36] on 7 Be → 7 Li production. Using the Kontos et al rate [32] , 7 Li/H = (5.2 ± 0.4) ×10 −10 is found, 15% higher than when using CF88.…”
Section: Thermonuclear Reaction Rate and Astrophysical Implicationsmentioning
confidence: 99%
“…Since one has factored out the strong energy dependence of σ(E) due to the barrier penetrability, the S-factor could be approximated by a smooth energy dependence in the absence of low-energy resonance. A lot of effort has been made to extract the S-factor in the low energy region in particular for transfer reactions experimentally [3,4,5,6]. Although to know the low energy S-factor for radiative capture reactions, still one needs the extrapolation with theoretical formulae [7].…”
Section: Pacs Numbersmentioning
confidence: 99%
“…We will make use of it, if there is no experimental data available at lower energies. Within this simple approach we have estimated the S-factor ratios for the proton and deuteron induced reactions with positive Q-values on the nuclei D, 6 Li, 7 Li, 9 Be, 10 B and 11 B. All the investigated reactions are listed in Table I and II.…”
Section: Pacs Numbersmentioning
confidence: 99%
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