γ-ray and decay spectroscopy of 194,195,196At

Excited states of At-195 have been studied by means of in-beam gamma-ray spectroscopy and the recoil-decay tagging technique. A strongly coupled rotational band feeding the alpha-decaying 7/2(-) state via unobserved transitions was identified. This band is presumably built on the oblate proton I-pi = 13/2(+) state. Confirming earlier measurements, a decays from the 1/2(+) and 7/2(-) states were observed. Additionally, an E3 branch competing with the alpha decay of the 7/2(-) state was inferred. Also alpha decays of the odd-odd isotopes At-194,At-196 were examined.