High-resolution study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Be</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>9</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>,<mml:math xml

Scholl, C.; Fujita, Y.; Adachi, T.; Brentano, P. von; Fujita, H.; Górska, M.; Hashimoto, H.; Hatanaka, K.; Matsubara, Hiroaki; Nakanishi, K.; Ohta, Takao; Sakemi, Y.; Shimbara, Y.; Shimizu, Y.; Tameshige, Y.; Tamii, A.; Yosoi, M.; Zegers, R. G. T.

doi:10.1103/physrevc.84.014308

Cited by 49 publications

(24 citation statements)

References 46 publications

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“…Later, a dedicated experiment at Oak Ridge [54] did not find such a resonance, in the 7 Be+d channel. Then, Kirsebom & Davids [55] pointed out that the properties of the corresponding 9 B level had been measured [56]. When used in the reaction rate and subsequent BBN calculation, the 7 Li depletion was found insignificant [55] (<4%).…”

Section: Sensitivity Studymentioning

confidence: 99%

Primordial Nucleosynthesis

Coc¹

2013

Acta Phys. Pol. B

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Abstract. Primordial nucleosynthesis, or Big Bang Nucleosynthesis (BBN), is one of the three evidences for the Big-Bang model, together with the expansion of the Universe and the Cosmic Microwave Background. There is a good global agreement over a range of nine orders of magnitude between abundances of 4 He, D, 3 He and 7 Li deduced from observations, and calculated in primordial nucleosynthesis. This comparison was used to determine the baryonic density of the Universe. For this purpose, it is now superseded by the analysis of the Cosmic Microwave Background (CMB) radiation anisotropies. However, there remain, a yet unexplained, discrepancy of a factor 3-5, between the calculated and observed lithium primordial abundances, that has not been reduced, neither by recent nuclear physics experiments, nor by new observations. We review here the nuclear physics aspects of BBN for the production of 4 He, D, 3 He and 7 Li, but also 6 Li, 9 Be, 11 B and up to CNO isotopes. These are, for instance, important for the initial composition of the matter at the origin of the first stars. Big-Bang nucleosynthesis, that has been used, to first constrain the baryonic density, and the number of neutrino families, remains, a valuable tool to probe the physics of the early Universe, like variation of "constants" or alternative theories of gravity.

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Section: Sensitivity Studymentioning

confidence: 99%

Primordial Nucleosynthesis

Coc¹

2013

Acta Phys. Pol. B

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“…16 Be and 13 Li exhibit direct two-neutron decay since a sequential decay is energetically forbidden. Twoneutron radioactivity was observed in the case of 26 O ground state.…”

Section: The 2 N-induced Nuclear Reactionsmentioning

confidence: 95%

“…The role of 14 MeV neutrons in light element nucleosynthesis studied by Kohley et al [3]: 16 Be, 13 Li, 10 He and 26 O. The correlations of the 3-body decay for the 16 Be and 13 Li were extracted and demonstrated a strong enhancement between two neutrons.…”

Section: The 2 N-induced Nuclear Reactionsmentioning

confidence: 99%

The role of 14 MeV neutrons in light element nucleosynthesis

2018

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Abstract-The 14 MeV neutron induced nuclear reactions which might contribute to better understanding of so-called "cosmological lithium problem" have been discussed. The BBN theory predicted 7 Li overestimated value could be lowered by 2 n induced reactions on Li-isotopes and/or 7 Be destruction via resonance in d+ 7 Be→ 9 B process. Proposals for 6 Li+ 2 n and 7 Li+ 2 n reactions cross section evaluations and measurements are discussed in some details.We discuss also a preliminary measurements of n-n coincidences from the 10 B(n,2n) 9 B reaction with two neutron detectors placed outside the cone of 14 MeV tagged neutron beam. From the time-of-flight measurements and known geometry we deduce the neutron energies and calculate the 9 B missing mass spectrum.

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“…Further, two recent experiments found evidence for a broad state in the mirror nucleus, 9 B, in this energy region through the 9 Be( 3 He,t) 9 B reaction [21,22]. Motivated by the previous published work, an additional state was introduced to the χ 2 minimisation routine and the data were refit.…”

Section: Peak Fittingmentioning

confidence: 99%