Abstract
Sharp, isospin-forbidden, T = 3 2 resonances in 17O have been studied by a measurement of the total neutron cross section of oxygen using the Karlsruhe neutron time-of-flight spectrometer. The transmission of a natural liquid oxygen target was measured at 190 m with a time-of-flight resolution of 5.5 ps m yielding an effective energy resolution of 1:2100 for 10 MeV neutrons. The absolute energy calibration allowed neutron resonance energies to be determined with an accuracy between 10 −5 and 10 −4. Total and partial decay widths and resonance energies have been determined assuming non-interfering multi-level Breit-Wigner resonances. The c.m. resonance parameters of the 17O first T = 3 2 state are: E c.m. = 6934.38±0.17 keV, Γ = 2.4±0.3 keV and Γ n0 = 1.88±0.12 keV. Besides the investigation of 10 known T = 3 2 states a search was undertaken for additional T = 3 2 resonances. The obtained results are compared with shell-model predictions of isospin mixing matrix elements and the systematics of isospin non-conserving particle decays.
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