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The reaction of triple radiative capture αα(n,γ)9Be studied in a β decay of 9Li

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Title: The reaction of triple radiative capture αα(n,γ)9Be studied in a β decay of 9Li
Authors: Mukha, I.1 Ivan.Mukha@fys.kuleuven.ac.be, Kavatsyuk, M.2,3, Algora, A.4,5, Batist, L.6, Blazhev, A.2,7, Döring, J.2, Grawe, H.2, Hellström, M.2, Kavatsyuk, O.2,3, Kirchner, R.2, La Commara, M.8, Mazzocchi, C.2, Plettner, C.9, Roeckl, E.2
Source: Nuclear Physics A. Jul2005, Vol. 758 Issue 1-4, p647-650. 4p.
Subjects: Radiative capture, Electromagnetic waves, Nuclear reactions, Spectrum analysis
Abstract: A new way of study the reaction of triple radiative capture αα(n,γ)9Be is demonstrated. At the GSI-ISOL facility, we have measured the γ decays of excited 1/2+, 5/2− and 1/2− states in 9Be, which are strongly populated in the β decay of 9Li. The respective partial γ-widths are of astrophysical interest in order to reliably estimate the αα(n,γ)9Be rates in SN type-II as a possible site of the synthesis of heavy elements in the Universe. The 9Li nuclei were implanted into a foil viewed by high-granularity arrays of β and γ detectors. The γ-ray spectra were measured in coincidence with the β-particles by selecting large β-γ angles in order to suppress the bremsstrahlung background. For the first time, the γ-rays from the 1/2+ and 5/2− states in 9Be were observed in 9Li decay, with the 1/2+-state energy and width measured to be 1689(10) and 224(7) keV, respectively, while the latter transition provided a reference point. The upper limit of the 1/2− partial γ-width is measured to be . An improved sensitivity experiment is feasible at facilities with the larger yield of 9Li. [Copyright &y& Elsevier]
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Abstract:A new way of study the reaction of triple radiative capture αα(n,γ)9Be is demonstrated. At the GSI-ISOL facility, we have measured the γ decays of excited 1/2+, 5/2− and 1/2− states in 9Be, which are strongly populated in the β decay of 9Li. The respective partial γ-widths are of astrophysical interest in order to reliably estimate the αα(n,γ)9Be rates in SN type-II as a possible site of the synthesis of heavy elements in the Universe. The 9Li nuclei were implanted into a foil viewed by high-granularity arrays of β and γ detectors. The γ-ray spectra were measured in coincidence with the β-particles by selecting large β-γ angles in order to suppress the bremsstrahlung background. For the first time, the γ-rays from the 1/2+ and 5/2− states in 9Be were observed in 9Li decay, with the 1/2+-state energy and width measured to be 1689(10) and 224(7) keV, respectively, while the latter transition provided a reference point. The upper limit of the 1/2− partial γ-width is measured to be . An improved sensitivity experiment is feasible at facilities with the larger yield of 9Li. [Copyright &y& Elsevier]
ISSN:03759474
DOI:10.1016/j.nuclphysa.2005.05.116