Onset of collectivity in neutron deficient Po196,198

We have studied via in-beam -ray spectroscopy Po196 and Po198, which are the first neutron-deficient Po isotopes to exhibit a collective low-lying structure. The ratios of yrast state energies and the E2 branching ratios of transitions from non-yrast to yrast states are indicative of a low-lying vibrational structure. The onset of collective motion in these isotopes can be attributed to the opening of the neutron i13/2 orbital at N112 and the resulting large overlap between the two valence protons in the h9/2 orbital and the valence neutrons in the i13/2 orbital

A Lesion of the Third Ventricle

Blurred vision; HeadacheA 35-year old female with blurred vision followed by loss of vision OU.VA: 20/50 OD, 20/30 OS; Color plates: 1/15 OD, 4/15 OSThird ventricular tumor consisting of ependymocytes compressing optic chiasm.VentriculostomyAttache