Evidence for the 11/2− Member of the K = 1/2− Band in 19F

Author:

Rogers D. W. O.,Dixon W. R.,Storey R. S.

Abstract

A new resonance at 3993 ± 2 keV has been found in the 15N(α,γ)19F reaction corresponding to a level at 7165.7 ± 1.0 keV in 19F which decays primarily to the 9/2 level at 4032 keV (94 ± 2%) and weakly to the 7/2 level at 3999 keV (6 ± 2%). The decay scheme, angular distributions, and radiative width (ωγ = 1.15 ± 0.23 eV) together with some crude estimates of α widths imply Jπ is most likely 11/2 The lifetime of the 9/2 level was measured using the DSAM to be τ = 87 ± 16 fs. The decay properties of the 11/2 and 9/2 levels agree well with the predictions for the 11/2 and 9/2 members of the K = 1/2 band in 19F.

Publisher

Canadian Science Publishing

Subject

General Physics and Astronomy

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