A reanalysis of radioisotope measurements of the Be(γ, n)Be cross-section
نویسنده
چکیده
The Be(γ, n)Be reaction is enhanced by a near threshold 1/2 state. Contradictions between existing measurements of this reaction cross-section affect calculations of astrophysical r-process yields, dark matter detector calibrations, and the theory of the nuclear structure of Be. Select well-documented radioisotope Be(γ, n) source yield measurements have been reanalyzed, providing a set of high-accuracy independently measured cross sections. A Breit-Wigner fit of these corrected measurements yields ER = 1738.8± 1.9 keV, Γγ = 0.771± 0.021 eV, and Γn = 268± 15 keV for the 1/2 state. A virtual 1/2 state is excluded with 99.3% confidence.
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