Doppler-Shift Attenuation Measurements of Lifetimes for (2s,1d)-Shell Nuclei Excited by Heavy-Ion Bombardment ofH2

The Doppler-shift attenuation method was used to measure the lifetimes of nuclear levels formed in the heavy-ion bombardment of titanium deuteride targets. The nuclei formed are those resulting from the "inverse" ($d,p$) and ($d,n$) reactions, using beams of ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$, ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$, ${}_{}{}^{34}{}_{}{}^{}\mathrm{S}$, ${}_{}{}^{35}{}_{}{}^{}\mathrm{Cl}$, and ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}$. Target backings of Mg, Al, and Cu were used as stopping media for the $\gamma$-decaying nuclei. $\gamma$ rays were observed, mostly at 0° to the beam, with a 35-${\mathrm{cm}}^3$ Ge(Li) detector. New results include mean lifetimes of 1.8±0.34 psec for the ${}_{}{}^{33}{}_{}{}^{}\mathrm{Cl}$ 811-keV level, 3.3±0.5 psec for the ${}_{}{}^{35}{}_{}{}^{}\mathrm{S}$ 1574-keV level, and 1.50±0.18 psec for the 2468-keV level of ${}_{}{}^{36}{}_{}{}^{}\mathrm{Cl}$. The advantages and limitations of the method are discussed.