An alpha-capture measurement of the radiative width of the first 8+ state in 20Ne

The radiative width of the 11.95 MeV 8+ Kpi =0+ level in 20Ne has been measured using the 16O( alpha , gamma )20Ne reaction and a differentially cryopumped gas target. The resonance strength was measured to be omega gamma =131+or-18 meV, which corresponds to a value of 9.2+or-1.3 Weisskopf units for the 8+ to 6+ E2 in-band transition probability. This is somewhat weaker than shell-model predictions normalised to the transitions between the lower members of the Kpi =0+ band.