Study of the Reactions ${}^{46, 48}{Ti}$ ( ${}^{14}C$ , ${}^{16}O$ ) ${}^{44, 46}{Ca}$ and ${}^{50, 52}{Cr}$ ( ${}^{14}C$ , ${}^{16}O$ ) ${}^{48, 50}{Ti}$ at 51 MeV

The first measurements are reported for (

{}^{14}C

{}^{16}O

) two-proton pickup reactions. Angular distributions for transitions up to ∼3.5 MeV excitation in

{}^{44, 46}{Ca}

and

{}^{48, 50}{Ti}

were obtained with a 51-MeV

{}^{14}C

beam. The angular distributions exhibit a characteristic

l

dependence. Significant two-proton-hole configurations are found in the first excited

0^{+}

states of

{}^{44}{Ca}

(1.88 MeV) and

{}^{46}{Ca}

(2.42 MeV). Evidence is presented for multistep excitation of the first

2^{+}

states, especially in

{}^{44}{Ca}

and

{}^{46}{Ca}

where one-step transitions are expected to be inhibited.

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Study of the ReactionsTi46,48(C14,O16)Ca44,46andCr50,52(C14,O16)Ti48,50at 51 MeV