Broad structure intspectra from (He3,t) reactions atEHe3=130MeV: Its angle and target-mass dependence

Triton spectra from ${}_{}{}^3{}_{}{}^{}\mathrm{He}$-induced reactions on ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, ${}_{}{}^{93}{}_{}{}^{}\mathrm{Nb}$, and ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ targets at $E_{{}_{}{}^3{}_{}{}^{}\mathrm{He}}=130\mathrm{}$ MeV have been measured in the $7.5°\le {\theta }_L\le 24°$ angular range in 1.5° steps. The spectra exhibit a broad structure; the centroid energy $E_c$ and the full width at half maximum $\Gamma$ of this "bump" are found to be independent of the target mass number $A$. Their average values are ${\overline{E}}_c=87\mathrm{}$ MeV and $\overline{\Gamma }=48\mathrm{}$ MeV with estimated errors of about ±2 MeV in both cases. Within the error bars the bump cross section is found to be consistent with $A^{\frac{1}{2}}$ proportionality and tends to decrease exponentially with angle; however, $A^{\frac{1}{3}}$ dependence cannot be excluded. In addition, the angular distributions possibly show indications for a weak oscillation pattern.