Energy Dependence of the Reorientation Effect and the Static Quadrupole Moment of the 0.847-MeV2+State inFe56

The energy dependence of the reorientation effect has been investigated using ${\mathrm{O}}^{16}$ and ${\mathrm{S}}^{32}$ ions incident on ${\mathrm{Fe}}^{56}$ nuclei. The influence of nuclear interference on the reorientation effect was observed before it could be detected on the elastic cross section, and exhibited an angular dependence similar to that expected for the reorientation effect. It was found that an appropriate separation of projectile and target nuclei was given by $2a=R_0({A_1}^{\frac{1}{3}}+{A_2}^{\frac{1}{3}})+\Delta$, where $R_0=1.6\mathrm{}$ fm and $\Delta \ge 3.5$ fm. The static quadrupole moment of the 0.847-MeV $2^{+}$ state in ${\mathrm{Fe}}^{56}$ was measured to be $Q_{22}=-0.23\mathrm{}\pm 0.03 \mathrm{b}$, while the rotational value is given by $\left|Q_R\right|=0.276\mathrm{} \mathrm{b}$.