Inelastic proton scattering to the3−and1+states inTi50,Cr52, andFe54

Inelastic scattering of 65-MeV protons on ${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$, ${}_{}{}^{52}{}_{}{}^{}\mathrm{Cr}$, and ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ has been measured for states of up to 11-MeV excitation energy. Clusters of $3^{\mathrm{-}}$ states in all three nuclei are found to form low-energy-octupole resonances at a mean energy of $E_x$∼7.5 MeV. The systematic decrease in excitation strength of the first $3^{\mathrm{-}}$ state with mass number has been observed. This decrease is interpreted in terms of the ‘‘blocking’’ effect on proton transitions from the sd shell orbits to the $f_{7/2}$ orbit. Many $1^{+}$ and possible $1^{+}$ states have been identified at $E_x$=5–10 MeV. In many cases, the $1^{+}$ assignments are in agreement with those of the previous works. A measurement of the ${}_{}{}^{49}{}_{}{}^{}\mathrm{Ti}$(d,p${)}^{50}$Ti reaction at 60 MeV has also been carried out to extract spectroscopic information on the fragmented $1^{+}$ states at around $E_x$=10 MeV in ${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$. One-particle–one-hole proton admixtures in the wave functions of the $1^{+}$ states in ${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$ are discussed.