Study of the pd reaction in the astrophysical energy region using the Hall accelerator

Bystritsky, V. M.; Gerasimov, V. V.; Krylov, A. R.; Parzhitskii, S. S.; Дудкин, Г. Н.; Kaminskii, V. L.; Nechaev, B. A.; Padalko, V. N.; Petrov, A. V.; Mesyats, G. A.; Filipowicz, M.; Wozniak, J.; Bystritskiǐ, V. M.

doi:10.1016/j.nima.2008.07.152

Cited by 34 publications

(38 citation statements)

References 17 publications

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“…1.a of DAACV. NACRE-II used the data from Table 3 in Bystritsky et al [38] (copied in Table IX); the systematic uncertainty, is less than 8%. Unlike DAACV, we do not use the Skopik et al [35] data because the energies are well above the limits of our adopted theoretical model.…”

Section: The Ma Et Al Datamentioning

confidence: 99%

New reaction rates for improved primordialD/Hcalculation and the cosmic evolution of deuterium

et al. 2015

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Primordial or big bang nucleosynthesis (BBN) is one of the three historical strong evidences for the big bang model. Standard BBN is now a parameter free theory, since the baryonic density of the Universe has been deduced with an unprecedented precision from observations of the anisotropies of the cosmic microwave background (CMB) radiation. There is a good agreement between the primordial abundances of 4 He, D, 3 He and 7 Li deduced from observations and from primordial nucleosynthesis calculations. However, the 7 Li calculated abundance is significantly higher than the one deduced from spectroscopic observations and remains an open problem. In addition, recent deuterium observations have drastically reduced the uncertainty on D/H, to reach a value of 1.6%. It needs to be matched by BBN predictions whose precision is now limited by thermonuclear reaction rate uncertainties. This is especially important as many attempts to reconcile Li observations with models lead to an increased D prediction. Here, we re-evaluates the d(p,γ) 3 He, d(d,n) 3 He and d (d,p) 3 H reaction rates that govern deuterium destruction, incorporating new experimental data and carefully accounting for systematic uncertainties. Contrary to previous evaluations, we use theoretical ab initio models for the energy dependence of the S-factors. As a result, these rates increase at BBN temperatures, leading to a reduced value of D/H = (2.45±0.10) × 10 −5 (2σ), in agreement with observations.

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Section: The Ma Et Al Datamentioning

confidence: 99%

New reaction rates for improved primordialD/Hcalculation and the cosmic evolution of deuterium

et al. 2015

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“…For stars similar to the Sun, pp cycle is one of the main sources of energy ~98%. Earlier, we have shown for the first time a significant influence of deuteron channeling in crystalline planes of metal deuterated targets made of titanium on the potential of the electronic screening of a nuclear reaction d(d, n) 3 He [4].…”

Section: Introductionmentioning

confidence: 82%

Research methods for parameters of accelerated low-energy proton beam

Bystritsky

Дудкин

Kyznetsov

et al. 2015

Phys. Part. Nuclei Lett.

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To study the pd reaction cross section it is necessary to know the main parameters of the acceler ated hydrogen ion beam with a high accuracy. These parameters include: the energy ion dispersion; the con tent of neutrals; the ratio of atomic and molecular ions of hydrogen in the flux of accelerated particles. This work is aimed at development of techniques and the measurement of the above mentioned parameters of the low energy proton beam.Keywords: nuclear reaction, electronic screening, metal deuteride target, Hall ion source, energy ion disper sion, content of neutrals, ratio of atomic and molecular ions, multigrid electrostatic spectrometer, secondary electron emission, time of flight method

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“…We chose the second option, with Marcucci et al [20] [D(p,γ) 3 He] and Arai et al [21] [D(d,n) 3 He and D(d,p) 3 H] as theoretical S -factors, keeping the normalization (α) as a free parameter that has to be determined by comparison with experimental data. The procedure we followed [5] for the D(p,γ) 3 He reaction was i) to select experimental datasets [22][23][24][25] for which systematic uncertainties were provided, ii) determine for each data set, by χ 2 minimization, the normalization factor to be applied to the theoretical S -factor of Marcucci et al [20], iii) add quadratically the systematic uncertainties and iv) perform a weighted average of the normalization factor. We obtained α = 0.9900 ± 0.0368 for this factor, that was subsequently used to scale the Marcucci et al S -factor, and calculate the thermonuclear D(p,γ) 3 He reaction rate and associated uncertainty.…”

Section: LI and D Nucleosynthesismentioning

confidence: 99%

“…2. Ratio of experimental [22][23][24][25], fitted [5,[27][28][29] and new theoretical [30] S -factors to the theoretical one [20]; the horizontal lines correspond to the theoretical S -factor scaled by α ± ∆α [5]. (Systematic uncertainties in the range 4.5-9% are not shown.…”

Section: LI and D Nucleosynthesismentioning

confidence: 99%

Primordial Nucleosynthesis

Coc

2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

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Primordial or big bang nucleosynthesis (BBN) is now a parameter free theory whose predictions are in good overall agreement with observations. However, the 7 Li calculated abundance is significantly higher than the one deduced from spectroscopic observations. Most solutions to this lithium problem involve a source of extra neutrons that inevitably leads to an increase of the deuterium abundance. This seems now to be excluded by recent deuterium observations that have drastically reduced the uncertainty on D/H and also calls for improved precision on thermonuclear reaction rates.

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Study of the pd reaction in the astrophysical energy region using the Hall accelerator

Cited by 34 publications

References 17 publications

New reaction rates for improved primordialD/Hcalculation and the cosmic evolution of deuterium

New reaction rates for improved primordialD/Hcalculation and the cosmic evolution of deuterium

Research methods for parameters of accelerated low-energy proton beam

Primordial Nucleosynthesis

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