The New 249 No Isotope

In the reaction of complete fusion of 48 Ca-ions with a 204 Pb target, a new α line, related to the decay of a new, previously unknown isotope ( 249 No), has been detected in an experiment carried out at the SHELS separator. The α decay energy ( E α = 9129 keV) and the half-life ( T 1/2 = 38.1 ± 2.5 ms) are measured using the GABRIELA detector array. The SF branching ratio was estimated ( b SF ≤ 0.2%).