Lowest TwoT=32States ofF17Observed in theO16(p,p)O16Reaction

The lowest

T = \frac{3}{2}

state of

{}^{17}F

has been observed in the isospin-forbidden

{}^{16}O (p, p) {}^{16}O

reaction, where anomalies have been found in the elastic channel and in the inelastic channels to the 6.13- and 7.12-MeV states of

{}^{16}O

. The partial width

Γ p_{0}

of this state as obtained from a phase-shift analysis of the elastic data is

Γ p_{0} = ({40_{- 20}}^{+ 10})

eV. The excitation energies of both the lowest and the next higher

T = \frac{3}{2}

states have been determined by using the

{}^{12}C (α, n) {}^{15}O

threshold and a

{}^{24}{Mg} (α, γ) {}^{28}{Si}

resonance as calibration points. Values of

E_{x} = 11.202 \pm 0.008

MeV (

E_{p} = 11.276 \pm 0.008

MeV) and 12.554±0.008 MeV (

E_{p} = 12.714 \pm 0.008

MeV) have been obtained, in agreement with the positions determined from the

{}^{15}N ({}^{3}{He}, n) {}^{17}F

reaction. The second

T = \frac{3}{2}

state is well suited as an energy calibration point for accelerators.

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