Measurements of the radiative widths of the first T = 1, 2+ state of 20Ne and their relationship to analog β-decays |
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Authors: | LK Fifield FP Calaprice CH Zimmerman MJ Hurst A Pakkanen TJM Symons F Watt KW Allen |
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Institution: | Nuclear Physics Laboratory, Oxford, England |
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Abstract: | The radiative widths for decays of the 20Ne T = 1, 2+ (10.27 MeV) state were measured by resonance α-capture in the reaction 16O(α, γ)20Ne. A special windowless gas-cell target yielded a low-background spectrum enabling six γ-branches to be observed with a Ge(Li) detector. The six branches correspond to decays from the 10.27 MeV level to the following levels: 2+(7.83 MeV), 2+(7.42 MeV), 3?(5.62 MeV), 2?(4.97 MeV), 2+(1.63 MeV) and 0+(g.s.). The branching ratios and radiative widths Γγ to these levels are: 7.83 MeV (0.22 ± 0.06)%, 0.008 ± 0.002 eV], 7.42 MeV (6.9 ± 0.4)%, 0.31 ± 0.04 eV], 5.62 MeV (2.1 ± 0.2)%, 0.097 ± 0.014 eV], 4.97 MeV (1.3 ± 0.1)%, 0.060 ± 0.008 eV], 1.63 MeV (88.9 ± 0.5)%, 4.08 ± 0.43 eV] and 0.0 MeV (0.64 ± 0.14)%, 0.029 ± 0.008 eV]. The radiative widths to the 1.63 MeV and 7.42 MeV levels are used to determine the CVC predictions of the weak magnetism form factors and their effects on certain β-decay observables are evaluated. |
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Keywords: | Nuclear reactions |
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