[Bubble] Impact of the 7Be(α,γ)11C reaction on the primordial abundance of 7Li

[Ugalde, Claudio]

Dear Jay,
11C is unstable @ 20 minutes. Maybe an experiment with a very heavy target could dissociate it through (gamma, alpha). 11C beams we can make in the lab, but a target out of it would out of the question. This would be an example where the forward reaction is a substantially better choice for a measurement.
Cheers!
Claudio


> On Mar 20, 2018, at 6:39 AM, Jay Benesch <benesch at jlab.org> wrote:
> 
> For your amusement I offer a posting on a reaction which might be possible to study via the photo-disintegration complement were it not for the 160 eV energy resolution required and the 270 keV energy.  Of course my reading may be way off.  And I haven't a clue as to the availability of a 11C target.
> 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_1803.06758&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=QIqmw5JVs6zZFqfrz-7aQA&m=Hot8rSLTYuGATlBVcpr7OeCv4dSbgMLeu3K4_nJ13UA&s=cn0Y_2yncdSmS19CaCkQZVmPTpbxiDcuGtqlrObCvcA&e= 
> 
> Impact of the 7Be(α,γ)11C reaction on the primordial abundance of 7Li
> M. Hartos, C. A. Bertulani, Shubhchintak, A. M. Mukhamedzhanov, S. Hou
> (Submitted on 18 Mar 2018)
> 
>   We calculate the radiative capture cross section for 7Be(α,γ)11C and its reaction rate for the big bang nucleosynthesis. The impact of this reaction on the primordial 7Li abundance is revised with the assumption of a narrow resonance in the low energy region. We show that such a resonance is unlikely to emerge within a two-body potential model. Taking the existence of this resonance for granted, we show that a small shift of its energy to a location right below the previously suggested value of Er=270 KeV, with a narrow width of 160 eV, can modify substantially the 7Li abundance and solve the cosmological lithium puzzle.
> 
> Comments: 	15 pages and 2 figures
> Subjects: 	Nuclear Theory (nucl-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Nuclear Experiment (nucl-ex)
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