Existence of α-cluster structure inTi44via the(6Li,d) reaction

α-cluster states in ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ti}$ have been investigated in the ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ ${(}^6$Li,d${)}^{44}$Ti reaction at E=50 MeV. The angular distributions of 34 levels at excitation energies for ${\mathit{E}}_{\mathit{x}}$=0–13 MeV allow us to analyze the data. The angular distributions of positive-parity members of the ground-state band (the ${\mathit{K}}^{\mathrm{\pi }}$=$0^{+}$ band) in ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ti}$ were well reproduced by the finite-range distorted-wave Born approximation calculations up to the transferred angular momentum of L=8. For the members of the negative-parity band (the ${\mathit{K}}^{\mathrm{\pi }}$=$0^{\mathrm{-}}$ band) with the primary quantum number N=13, three levels at 6.22, 7.34, and 9.43 MeV were identified as the $1^{\mathrm{-}}$, $3^{\mathrm{-}}$, and $5^{\mathrm{-}}$ states, respectively. The existence of a negative-parity band in ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ti}$ has been investigated for a long time and persistently gives considerable support to α-cluster models for nuclei heavier than A=40.