Lifetimes of the(f72)3152−states inV51andCa43and(f72)24+states inTi50andCa42via heavy-ion recoil-distance-method measurements

Abstract

The recoil-distance method has been used in conjunction with heavy-ion reactions to measure the following mean lifetimes: $\tau =8.0\mathrm{}\pm 0.6 \mathrm{and} 34.1\pm 1.5$ psec for the ${\left(f_{\frac{7}{2}}\right)}^3$ (${\frac{15}{2}}^{-}$) states at 2700 keV in ${}_{}{}^{51}{}_{}{}^{}\mathrm{V}$ and at 2754 keV in ${}_{}{}^{43}{}_{}{}^{}\mathrm{Ca}$, and $\tau =7.7\mathrm{}\pm 1.5 \mathrm{and} 5.1\pm 0.4$ psec for the ${\left(f_{\frac{7}{2}}\right)}^2{4}^{+}$ states at 2676 keV in ${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$ and at 2752 keV in ${}_{}{}^{42}{}_{}{}^{}\mathrm{Ca}$, respectively. The resulting $B\left(E2\mathrm{}\right)\mathrm{}$ strengths are interpreted in terms of effective charges for different model spaces.