Systematics ofE2transition strengths in the Zn—Kr region

The observed electromagnetic properties, namely, (1) the $B\left(E2\right)$ values for inband transitions in the collective bands of even-even isotopes ${}_{}{}^{62-70}{}_{}{}^{}\mathrm{Zn}$, ${}_{}{}^{66-78}{}_{}{}^{}\mathrm{Ge}$, ${}_{}{}^{70-82}{}_{}{}^{}\mathrm{Se}$, and ${}_{}{}^{74-86}{}_{}{}^{}\mathrm{Kr}$, and (2) their electric quadrupole moments of first $2^{+}$ states have been studied in the projected Hartree-Fock model. The calculations have been performed in the ($1p_{\frac{3}{2}}0f_{\frac{5}{2}}1p_{\frac{1}{2}}0g_{\frac{9}{2}}$) model space using Kuo-Brown effective interaction. The $E2$ transition strengths have been studied for the yrast and yrare positive parity bands as well as for the recently observed negative parity collective bands. Using a simple structure for the collective band of states, namely, states with definite angular momentum projected from the lowest few deformed intrinsic Hartree-Fock states and using the effective charges $e_p=1.6e$ and $e_n=1.0e$ the observed systematics of $B\left(E2\mathrm{}\right)\mathrm{}$ values are fairly well reproduced.