Levels ofNp237Excited by theU236(He3, d)Np237andU236(α, t)Np237Reactions

The ${}_{}{}^{236}{}_{}{}^{}\mathrm{U}({}_{}{}^3{}_{}{}^{}\mathrm{He}, d){}_{}{}^{237}{}_{}{}^{}\mathrm{Np}$ and ${}_{}{}^{236}{}_{}{}^{}\mathrm{U}(\alpha , t){}_{}{}^{237}{}_{}{}^{}\mathrm{Np}$ reactions were studied with 30-MeV ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ beams. Rotational bands built upon the following Nilsson proton configurations in ${}_{}{}^{237}{}_{}{}^{}\mathrm{Np}$ were identified: ${\frac{5}{2}}^{+}\mathrm{}\left[642\right]\mathrm{}$ (0 keV), ${\frac{5}{2}}^{-}\mathrm{}\left[523\right]\mathrm{}$ (60 keV), ${\mathrm{½}}^{-}$[530] (268 keV), ${\frac{3}{2}}^{-}\mathrm{}\left[521\right]\mathrm{}$ (514 keV). Experimental spectroscopic factors are compared with theoretical ones computed for Woods-Saxon and harmonic-oscillator-type nuclear potentials. A strong $l$ dependence of the cross-section ratio $\frac{d\sigma (\alpha , t)}{d\sigma ({}_{}{}^3{}_{}{}^{}\mathrm{He}, d)}$ has been observed.