Lifetime measurements and $E 2$ effective charges for nuclei in the $1 f_{\frac{7}{2}}$ shell

Lifetimes for a number of levels in nuclei with

40 < A < 56

have been measured using the recoil-distance technique. The experimental results for the mean lifetimes are

45_{- 7}^{+ 10}

psec for the 1491-keV

3^{+}

and 57 ± 10 psec for the 1511-keV

5^{+}

levels in

{}^{42}{Sc}

; 8.1 ± 1.1 psec for the 2987-keV

{\frac{15}{2}}^{-}

level in

{}^{43}{Sc}

; 19.6 ± 1.7 psec for the 3285-keV

6^{+}

level in

{}^{44}{Ca}

; 12.8 ± 1.2 psec for the 3334-keV

6^{+}

level in

{}^{48}{Ti}

; 5.1 ± 1.0 psec for the 1021-keV

{\frac{11}{2}}^{-}

level in

{}^{49}V

; 12.6 ± 2.1 psec for the 783-keV

2^{+}

level in

{}^{50}{Cr}

; 20.4 ± 3.3 psec for the 238-keV

{\frac{7}{2}}^{-}

level in

{}^{51}{Mn}

;

{13.7}_{- 2.3}^{+ 3.6}

psec for the 2369-keV

4_{1}^{+}

, 59.5 ± 3.3 psec for the 3114-keV

6^{+}

, and 10.4 ± 1.2 psec for the 3469-keV (

3^{\pm}

5^{-}

) levels in

{}^{52}{Cr}

; 15.5 ± 1.8 psec for the 2563-keV

{\frac{13}{2}}^{-}

and 3.9 ± 0.6 psec for the 2693-keV

{\frac{15}{2}}^{-}

levels in

{}^{53}{Mn}

; and 5.7 ± 1.2 psec for the 2538-keV...

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Lifetime measurements andE2effective charges for nuclei in the1f72shell