Direct capture cross section of Be9(n,γ)Be10

Abstract

The cross section of the 9 Be(n,γ) 10 Be reaction was calculated in the direct capture model. All parameters of the calculations were adjusted to properties of the 9 Be + n system at thermal energies. The calculated cross section at thermonuclear energies shows the expected 1/v behavior of s-wave capture at low energies, but increases towards higher energies as typical p-wave capture. Excellent agreement between new experimental data in the astrophysically relevant energy region and the present calculation is found.

Radiative 9Be(n,γ0+1+2+3+4+5)10Be reaction rate in the potential cluster model*

“…Path (1a) is the Lithium-Boron-Carbon (Li-B-C) chain, and (1b) is the Lithium-Berillium-Boron-Carbon (Li-Be-B-C) chain. Reaction 9 Be(n,γ) 10 Be in (1b) plays the role of trigger for ignition of the B-C path. That is reasonable as 10 Be is a long-lived isotope (1.387×10 6 years) and, therefore, may play the role of seed nucleus.…”

“…Reaction 9 Be(n,γ) 10 Be in (1b) plays the role of trigger for ignition of the B-C path. That is reasonable as 10 Be is a long-lived isotope (1.387×10 6 years) and, therefore, may play the role of seed nucleus.…”

“…There is one more matter of concern for the 9 Be(n,γ) 10 Be process: Terasawa and coworkers raised the issue of the critical reaction flows leading to the production of carbon isotopes (Fig. 6 in Ref.…”

“…It was pointed out in [4] that the switch-off of the 10 Be(α,γ) 14 C reaction in the Be-isotope chain leads to the ignition of the Li-Be-C reaction flow: We will pay special attention to the 9 Be(n,γ) 10 Be reaction in the beryllium paths (1b) and (1c). Our motivation concerns the disputed point of view on the origin of 10 Be: The current position is that 10 Be cannot be produced by thermonuclear reactions in stars [5] but is processed via cosmic-ray spallation [6]. Meanwhile, the rate of the 9 Be(n,γ) 10 Be reaction is included in the network for calculation of the abundance of the beryllium isotopes in the context of BB nucleosynthesis up to CNO [7,8].…”

“…Our motivation concerns the disputed point of view on the origin of 10 Be: The current position is that 10 Be cannot be produced by thermonuclear reactions in stars [5] but is processed via cosmic-ray spallation [6]. Meanwhile, the rate of the 9 Be(n,γ) 10 Be reaction is included in the network for calculation of the abundance of the beryllium isotopes in the context of BB nucleosynthesis up to CNO [7,8].…”