Measurements of the radiative widths of the first T = 1, 2+ state of 20Ne and their relationship to analog β-decays

L. K. Fifield, Frank Calaprice, C. H. Zimmerman, M. J. Hurst, A. Pakkanen, T. J.M. Symons, F. Watt, K. W. Allen

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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.

Original languageEnglish (US)
Pages (from-to)57-81
Number of pages25
JournalNuclear Physics, Section A
Volume288
Issue number1
DOIs
StatePublished - Sep 19 1977

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Fifield, L. K., Calaprice, F., Zimmerman, C. H., Hurst, M. J., Pakkanen, A., Symons, T. J. M., Watt, F., & Allen, K. W. (1977). Measurements of the radiative widths of the first T = 1, 2+ state of 20Ne and their relationship to analog β-decays. Nuclear Physics, Section A, 288(1), 57-81. https://doi.org/10.1016/0375-9474(77)90081-1