Levels ofKr86fromRb87(t,α)Kr86

The levels of ${}_{}{}^{86}{}_{}{}^{}\mathrm{Kr}$ have been investigated by the ${}_{}{}^{87}{}_{}{}^{}\mathrm{Rb}(t,\alpha )$ reaction with 15-MeV tritons. $\alpha$-particle spectra were recorded with a semiconductor counter telescope at c.m. angles between 13° and 73°, and excited states were observed up to 4.3 MeV. Differential cross sections for 13 levels were compared with distorted-wave Born-approximation calculations, giving $l_p$ values and spectroscopic factors. The predominant $l_p=1\mathrm{}$ and $l_p=3\mathrm{}$ reaction amplitudes, which are assumed to represent $2p_{\frac{3}{2}}$ and $1f_{\frac{5}{2}}$ proton pickup, are essentially exhausted by 4 MeV excitation. All of the experimental angular distributions are best fitted with a single value of $l_p$, although $l_p=1, 3$ mixtures would be expected for population of $2^{+}$ levels. One definite $l_p=4\mathrm{}$ angular distribution was observed, indicating a small $1g_{\frac{9}{2}}$ proton component in the ${}_{}{}^{87}{}_{}{}^{}\mathrm{Rb}$ ground state. Results of this experiment are compared with recently reported ${}_{}{}^{86}{}_{}{}^{}\mathrm{Kr}(p,p^{\prime })$ and ${}_{}{}^{86}{}_{}{}^{}\mathrm{Br}$ decay data.