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The resonance structure in $^{11}$C is particularly of interest with regardto the astrophysical $^{7}$Be($\alpha$, $\gamma$) reaction, relevant at hightemperature, and to the $\alpha$-cluster structure in $^{11}$C. The measurementwas to determine unknown resonance parameters for the high excited states of$^{11}$C. In particular, the $\alpha$ decay width can be useful information todiscuss $\alpha$ cluster structure in $^{11}$C. New measurements of the$^{7}$Be+$\alpha$ resonant scattering and the $^{7}$Be($\alpha$, $p$)$^{10}$Breaction in inverse kinematics were performed for center-of-mass energy up to5.5 MeV, and the resonances at excitation energies of 8.9--12.7 MeV in thecompound $^{11}$C nucleus were studied. Inelastic scattering of$^{7}$Be+$\alpha$ and the $^{7}$Be($\alpha$, $p_1$)$^{10}$B$^*$ reaction werealso studied with a simultaneous $\gamma$-ray measurement. The measurementswere performed at the low-energy RI beam facility CRIB (CNS Radioactive IonBeam separator) of the Center for Nuclear Study (CNS), the University of Tokyo.We obtained excitation functions of $^{7}$Be($\alpha$, $\alpha_0$)$^{7}$Be(elastic scattering), $^{7}$Be($\alpha$, $\alpha_1$)$^{7}$Be$^*$ (inelasticscattering), $^{7}$Be($\alpha$, $p_0$)$^{10}$B, and $^{7}$Be($\alpha$,$p_1$)$^{10}$B$^*$. Many resonances including a new one were observed and theirparameters were determined by an R-matrix analysis. The resonances we observedpossibly enhance the $^{7}$Be($\alpha$, $\gamma$) reaction rate but in asmaller magnitude than the lower-lying resonances. A new negative-paritycluster band, similar to the one previously suggested in the mirror nucleus$^{11}$B, is proposed.

Alpha-resonance structure in $^{11}$C studied via resonant scattering of $^{7}$Be+$\alpha$ and $^{7}$Be($\alpha$, $p$) reaction