Neutron resonance spectroscopy. XVI.In113,In115

Results of neutron time of flight spectroscopy measurements for natural indium and separated ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}$, using the Nevis synchrocyclotron, are given. Transmission and self-indication measurements were made for a range of natural indium sample thicknesses and for a sample of 99.5% enriched ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}_2^{}{}_{}{}^{}$ ${\mathrm{O}}_3$. Resonance parameters $E_0$ and $g{\Gamma }_n^0$ are given to 2 keV. Part of the isotope assignment was made with the aid of ${}_{}{}^{113}{}_{}{}^{}\mathrm{In}$ raw capture data taken at Geel by C. Coceva. Some ${\Gamma }_{\gamma }$ values were also obtained, from which we estimate $〈{\Gamma }_{\gamma }〉$ to be 75 meV for ${}_{}{}^{113}{}_{}{}^{}\mathrm{In}$ (based on three levels), and 85 meV for ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}$ (15 levels). The $l=0\mathrm{}$ strength function for ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}$ is $10{}_{}{}^4{}_{}{}^{}S_0^{}{}_{}{}^{}=0.26\mathrm{}\pm 0.03$. Comparison of the ${\left(g{\Gamma }_n^0\right)}^{\frac{1}{2}}$ distribution with Porter-Thomas theory for ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}$ shows that many $p$ levels are observed. An estimate of the level detection sensitivity and a Bayes's theorem analysis allow a determination of the $p$ strength function and its uncertainty: $10{}_{}{}^4{}_{}{}^{}S_1^{}{}_{}{}^{}=2.7+1.0\mathrm{} or-0.7\mathrm{}$ for ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}$. We find $〈D〉=(9.4\mathrm{}\pm 0.2)$eV for ${}_{}{}^{115}{}_{}{}^{}\mathrm{In}$ $s$ levels.