Evidence forO+and1−Levels inU234Populated in the One-Minute Beta Decay ofPa234

A directional correlation measurement has been performed on the 250-kev vs (751+795)-kev composite cascade in ${\mathrm{U}}^{234}$ following the 24-day beta decay of ${\mathrm{Th}}^{234}$ and the subsequent one-minute beta decay of ${\mathrm{Pa}}^{234}$. The "770"-kev (751+795 kev) composite photopeak spectrum coincident with the 250-kev gamma ray was displayed on a multichannel pulse-height analyzer for different positions of the scintillation counters. From these spectra the directional correlations between the 250-kev gamma ray and the lower and upper sides of the 770-kev composite line were measured. The results together with other measurements are consistent with assignments of multipolarity $E1\mathrm{}$ to the 250-, 751-, and 795-kev gamma rays and spin and parity assignments $0^{+}$-$1^{-}$-$2^{+}$ and $0^{+}$-$1^{-}$-$0^{+}$ to the levels involved in the 250-751 kev and 250-795 kev gamma-gamma cascades, respectively. Thus new levels are proposed at 795 and 1046 kev with spin and parity $1^{-}$ and $0^{+}$, respectively.