Abstract
The reactions 18O(p, p′ γ) 18O, 18O(p, n′ γ) 18F and 18O(p, α' γ) 15N were observed simultaneously from the yields of 0.937, 1.041,1.080, 1.939, 1.982, 3.921 and 5.270 MeV γ-rays from the decay of excited states of the final nuclei. Excitation functions were measured for proton energies 4.40 to 4.62,4.75 to 4.83 and 5.60 to 5.66 MeV. The yield curves show strong resonances in the inelastic proton channels at E p = 4.48, 4.58, 4.78 and 5.63 MeV corresponding to 19F levels at 12.24, 12.33, 12.52 and 13.33 MeV. Spin and parity assignments were made from the γ-ray angular distributions. The 12.33 MeV, 12.52 MeV and 13.33 MeV states in 19F were assigned J π = ( 3 2 +), 5 2 (+) and 3 2 − respectively and identified as analogues of 4.998, 5.146 and 5.706 MeV levels of 19O. A comparison of the excited levels of 19F is made to levels of 19O up to an excitation energy of 6.276 MeV.
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