The 3He(α, γ)7Be reaction at very low energy

Nagatani, K.; Dwarakanath, M.R.; Ashery, D.

doi:10.1016/0375-9474(69)90995-6

Cited by 92 publications

(73 citation statements)

References 7 publications

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“…It is about equal to the value presently used in solar neutrino work [3]. [53][54][55][56][57][58]. Symbols for the data are the same as in Ref.…”

Section: Bmentioning

confidence: 92%

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Nollett

2001

Phys. Rev. C

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We report the first calculations of cross sections for the radiative capture reactions 3 H(α, γ) 7 Li and 3 He(α, γ) 7 Be below 2 MeV which use wave functions derived from realistic nucleon-nucleon interactions by the variational Monte Carlo technique. After examining several small corrections to the dominant E1 operator, we find energy dependences for the low-energy S-factors which agree reasonably with experimental measurements. There is no contradiction with the previous theoretical understanding of these processes, but the zero-energy derivative of the 3 H(α, γ) 7 Li S-factor is smaller than in most models. While this method can in principle predict cross section normalizations, the normalizations of our results are mostly too low.

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“…It is about equal to the value presently used in solar neutrino work [3]. [53][54][55][56][57][58]. Symbols for the data are the same as in Ref.…”

Section: Bmentioning

confidence: 92%

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Nollett

2001

Phys. Rev. C

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“…The apparent discrepancy at 2σ between experiments that observe capture gamma rays from this process (Refs. [64][65][66][67][68][69]) and those that observe photons from the 7 Be decay (Refs. [69][70][71]) is well-known from discussions of the solar neutrino problem [72].…”

Section: He(d P) 4 Hementioning

confidence: 99%

Estimating reaction rates and uncertainties for primordial nucleosynthesis

2000

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We present a Monte Carlo method for direct incorporation of nuclear inputs in primordial nucleosynthesis calculations. This method is intended to remedy shortcomings of current error estimation, by eliminating intermediate data evaluations and working directly with experimental data, allowing error estimation based solely on published experimental uncertainties. This technique also allows simple incorporation of new data and reduction of errors with the introduction of more precise data. Application of our method indicates that previous error estimates on the calculated abundances were too large by as much as a factor of three. Since uncertainties in the BBN calculation currently dominate inferences drawn from light-element abundances, the re-estimated errors have important consequences for cosmic baryon density, neutrino physics, and lithium depletion in halo stars. Our direct method allows detailed discussion of the status of the nuclear inputs, by identifying clearly the places where improved cross section measurements would be most useful. 26.35.+c, 98.80.Ft

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“…Several experimental studies followed this pioneering work in the next decades aiming at the determination of the 3 He(α, γ) 7 Be cross section at energies as low as possible in order to approach the astrophysically relevant energy range [4,5,6,7,8,9,10,11]. This energy range, the so called Gamow window, lies between about 15 and 30 keV at 15 MK temperature relevant for the solar core.…”

Section: Introductionmentioning

confidence: 99%

Activation measurement of the reaction cross section at high energies

et al. 2013

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The astrophysically important 3 He(α, γ) 7 Be reaction was studied at high energies where the available experimental data are in contradiction. A thin window 3 He gas cell was used and the cross section was measured with the activation method. The obtained cross sections at energies between E c.m. = 1.5 and 2.5 MeV are compared with the available data and theoretical calculations. The present results support the validity of the high energy cross section energy dependence observed by recent experiments.

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The 3He(α, γ)7Be reaction at very low energy

Cited by 92 publications

References 7 publications

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Estimating reaction rates and uncertainties for primordial nucleosynthesis

Activation measurement of the reaction cross section at high energies

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