Lifetimes of the $6_{1}^{+}$ states in ${}^{42}{Ti}$ and ${}^{46}{Ca}$ and $E 2$ effective charges in ${(1 f_{\frac{7}{2}})}^{\pm 2}$ nuclei

The mean lifetimes of the

6_{1}^{+}

states in

{}^{42}{Ti}

at 3041 keV and

{}^{46}{Ca}

at 2974 keV have been measured with the pulsed beam method to be

τ = 5 \pm 2 ns and 15.2 \pm 0.8 ns

, respectively. The states were populated via the reactions

{}^{40}{Ca} ({}^{3}{He} n) {}^{42}{Ti}

E_{{}^{3}{He}} = 12

MeV and

{}^{48}{Ca} (α, α 2 n) {}^{46}{Ca}

E_{α} = 50

MeV. The deduced

B (E 2, 6^{+} \to 4^{+})

values result in proton and neutron effective charges which are in good agreement with other

{(1 f_{\frac{7}{2}})}^{\pm 2}

nuclei. However, the present lifetime result for

{}^{42}{Ti}

is in disagreement with another measurement for this nucleus. A comparison of

E 2

effective charges extracted from all presently available

B (E 2)

data on the

6^{+}

→

4^{+}

→

2^{+}

→

0^{+}

transitions in

{(1 f_{\frac{7}{2}})}^{\pm 2}

nuclei is presented.

This publication has 18 references indexed in Scilit:

Lifetimes of the61+states inTi42andCa46andE2effective charges in(1f72)±2nuclei